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Insulation > Electrical > Flashcards

Electrical Flashcards

1
Q

Which of the following installations is UNSAFE?

a) NM wire in a detached garage

b) 8 gauge wire on a 30 amp circuit

c) 12 gauge/2 conductor wire servicing a baseboard heater

d) NM wire under a sandbox

e) knob-and-tube wire joined to new wiring in a junction box

A

D@

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2
Q

All of the breakers in a service panel are white, except one, which is black. You should be checking

a. that the black breaker is correctly sized for the wire.

b. that the black breaker is suitable for use in the panel, if this is determinable.

c. that the black breaker isn’t loose.

d. All of the above

A

D

you should check that the breaker is properly sized and is compatible with this panel. you should make sure that it was a professionally installed (and not forced into place) and that the breaker isn’t loose.

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3
Q

Problems with aluminum wiring include all of the following EXCEPT that

a. it tends to creep.

b. it lacked a ground wire.

c. the aluminum oxide is not a good conductor of electricity.

d. aluminum is softer than copper and easier to damage.

A

B@

Lacking a ground wire is not a common problem with aluminum wire.

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4
Q

Which type of wire is rated for underground use?

a) UF or NMWU

b) NMW

c) NMDU

d) BXU

e) UUDW

A

A@

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5
Q

Electrical ground wires may attach to all of these, EXCEPT:

a. Ground rods

b. Water supply pipe

c. Buried footing

d. Floor joist

A

D

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6
Q

Extension cords are typically

a. stranded wire.

b. solid wire.

c. designed to be held in place with staples.

d. best protected if run under carpets.

A

A@

Extension cords are typically stranded wire. This is so they will be more flexible than solid wire.

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7
Q

The end of the neutral wire from a 3-conductor cable is overheating. The reason for this could be any of these except

a) the wire is loose

b) the circuit breakers are undersized

c) both sides of the multi-wire circuit are drawing from the same bus

d) the wire is nicked

e) the wire is aluminum

A

B!

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8
Q

Water stains on the soffit around the hole where service mast passes through is most likely the result of

a. improper flashing where the mast penetrates the roof.

b. a lack of a drip loop.

c. a lack of caulking between the soffit and the mast.

d. a cracked masthead.

A

A!

Water stains on the soffit, where the mast goes through the roof, usually indicate a flashing problem.

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9
Q

Which of the following would least likely to be found on a dedicated circuit?

a) baseboard heater.

b) furnace

c) ceiling fan

d) dishwasher.

e) food waste disposal (disposer)

A

C@

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10
Q

Is it permissible to use an aluminum grounding wire?

A) Only if it is at least #3 AWG.

B) Yes.

C) Only in some provinces and states.

D) Only in dry environments in the United States.

A

D!

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11
Q

During an inspection you find 20 blown 15-amp fuses beside the panel. You might tell your client

A) it’s likely that there is at least one overloaded circuit in the panel.

B) the 15 amp fuses should be replaced with a larger fuse size that will not blow.

C) there must have been several defective fuses purchased, perhaps from one bad lot.

D) it’s likely that there is a defect in the panel.

A

A@

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12
Q

Which is the least common type of connection for branch circuit wiring seen in a new house?

a) bayonet

b) Marr®

c) screw

d) soldered

e) twist-on

A

D@

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13
Q

Overloading the neutral wire on a multi-wire branch circuit

A) means that the neutral wire was undersized.

B) indicates a short in the circuit.

C) is the result of failing to fuse the neutral.

D) is likely if the black and red wires are powered from the same bus.

A

D@

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14
Q

What factor determines the electrical service size to a house?

a. The size of the drip loop

b. The size of the meter

c. How close the house is to the transformer

d. The size of the service entrance wires

A

D

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15
Q

Ohm’s Law, the relationship between voltage, current, and resistance in a simple circuit, states that

a. V=lR.

b. l=VR.

c. R = IlV.

d. V=UR.

A

A!

V=IR.

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16
Q

All of the following are panel wire problems EXCEPT

a. overheating.

b. wires crossing bus bars.

c. sheathing removed.

d. abandoned wires.

A

C

Sheathing that has been removed on the panel wires is not a problem.

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17
Q

Attic wires should not ordinarily be run on top of ceiling joists unless

a) the headroom is less than 40 inches

b) plywood covers them

c) insulation covers them

d) they are visible

e) it is certain that animals won’t gain access

A

A@

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18
Q

Special grease on aluminum wires is

a. found on number 12-gauge and 10-gauge wires.

b. found on stranded wires.

c. found on service entrance wires only.

d. used to control creep.

A

B@

The special grease on aluminum wires is typically used on stranded wires.

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19
Q

These are all possible causes for an inoperative light, EXCEPT:

a. Bulb burned out

b. Faulty light fixture

c. Poor connection in box

d. Missing grounding wire

A

D

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20
Q

A special grease is applied to larger gauge aluminum wires to

a) reduce slippage

b) improve conveyance

c) help identify the wire as aluminum

d) inhibit corrosion

e) dissipate heat.

A

D@

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21
Q

If two 60-W light bulb branch circuits are wired in parallel, and another parallel 60-W light bulb branch circuit is added

a. the bulb closest to the voltage source will be brightest.

b. each bulb will have the same brightness.

c. the total current in the circuit stays the same.

d. the current in each branch will decrease.

A

B!

In a parallel circuit, any bulbs that you add will have the same brightness, so long as the circuit is not overloaded.

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22
Q

What is the correct fuse or breaker size for 8 gauge AWG copper wire?

a. 15 amps

b. 20 amps

c. 30 amps

d. 40 amps

A

D

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23
Q

Overheated wires may have resulted from all of the following EXCEPT

a) underfusing

b) a loose connection

c) a nicked wire

d) an undersized wire

e) proximity to a water heater vent

A

E@

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24
Q

Knob-and-tube wiring issues include all of the following EXCEPT

a. connections to modern wire not in boxes.

b. wires buried in insulation.

c. brittle wire, insulation, or sheathing.

d. overheated neutrals on multiwire branch circuits.

A

D@

Overheated neutrals on multiwire branch circuits are not specific to knob and tube wiring. Multiwire branch circuits are, in fact, very rare on knob and tube wiring.

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25
Q

The electrical force that is available in a home electrical system is known as:

a. Current

b. Resistance

c. Voltage

d. Power

A

C

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26
Q

What is a brief definition of an amp?

(a) An amp is a measure of how much electrical current is flowing (I=V/R).

(b) An amp is a measure of how much water is flowing (I=V/R).

(c) An amp is a measure of how much electrical current is resisting (I=V/R).

(d) An amp is a measure of how much electrical volume is flowing (I=V/R).

A

A

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27
Q

All of these are common branch circuit problems EXCEPT

a. NMD wires run through floor joists without tubes or grommets.

b. damaged wires.

c. open splices

d. undersized wire.

A

A@

NMD wires run through floor joists without tubes or grommets are not a problem.

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28
Q

The main fuses or breakers are most likely to trip

a) during cold weather

b) during hot weather

c) after 11:00 pm

d) when many large appliances are on

e) when most of the lights are on

A

D

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29
Q

Common switch problems include all of the following except

A) switches for garbage disposals on the front of base cabinets.

B) damaged switches.

C) dimmer switches with a positive shut off.

D) inoperative switches.

A

C@

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30
Q

Which one of the following is NOT a possible cause of the service mast, conduit, or cable letting water in?

a. Movement of the components

b. Deterioration of materials over time

c. Conduit undersized

d. Building settlement

A

C!

Undersized conduit can’t be the cause of water getting into the electrical system.

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31
Q

A kitchen split receptacle is a

a. switched circuit operating a wall receptacle.

b. receptacle with a test button required near kitchen sinks.

c. circuit servicing a separate cooktop and oven.

d. receptacle with the top and bottom halves on different circuits.

A

D!

A kitchen split receptacle is a duplex receptacle with the top and bottom halves on different circuits.

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32
Q

What is linking?

a. Linking ensures that light switches only operate the fixtures installed in the same room.

b. Linking is the same as bonding.

c. Linking ensures that two fuses or circuit breakers are disconnected at the same time.

d. Linking refers to connections made in a junction box.

A

C!

Linking ensures that two fuses or circuit breakers are disconnected at the same time. This is important on 240-volt circuits or multiwire branch circuits.

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33
Q

How many wires (conductors) are there from the street into a house in a 240-volt system?

a. 1

b. 2

c. 3

d. 4

A

C

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34
Q

The reasons for dedicated circuits are

a) the circuit uses so much electricity, or the circuit is so important

b) the circuit is so important, and you can’t hook high-demand circuits up in series

c) we want to avoid nuisance tripping, and the appliances are near a wet location

d) the high start-surge is a problem, and the high operating temperatures of furnaces and boilers may overheat the wire

A

A@

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35
Q

Most electrical codes don’t require a bottom-of-the-stairs light switch in a basement if

a) the basement is unfinished

b) there is another switch elsewhere in the basement

c) the basement is under 500 square feet

d) the ceiling height is under 7 feet

e) the basement is only one room

A

A@

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36
Q

The exterior sides and bottom of the service box are rusting. The interior of the service box is not affected. There is a water stain on the foundation wall below the service box. The box is below grade. Your best conclusion from these clues is

a) plumbing leakage; check for a pipe above

b) no sealant between the wires and the inside of the conduit

c) defective service cap (weatherhead)

d) no drip loop

e) leakage at the foundation wall conduit hole

A

E!

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37
Q

A 1500 square foot house has an electric stove, electric dryer, central air conditioning (FLA = 18 amps), and a recent basement renovation that included the installation of a 3000 watt sauna. If it has a 60A service, you should report that

a) the existing service is adequate

b) the existing service will support additional loads

c) the service should be upgraded

d) additional loads should be upgraded,
otherwise the service is okay

e) the sauna should be used in winter only

A

C!

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38
Q

Disadvantages of pigtailing aluminum to copper wire are

a. the two metals are not compatible.

b. it adds more connections and leads to overcrowding boxes.

c. you can’t pigtail different sized wire gauges together.

d. the solder isn’t likely to be effective.

A

B@

Pigtailed connections with aluminum wire add more connections to the box and may lend to overcrowding.

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39
Q

Assuming copper, standard wire type, and normal temperature rating, what is the typical conductor size (in AWG) for a 60-A service?

a. #10

b. #6

c. #4

d. #3

A

6-gauge wire is adequate for 60-amp service.

B!

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40
Q

How far should wires be kept from the metal vent connector on a gas appliance?

a. One inch.

b. Six inches

c. Nine inches

d. Eighteen inches

A

B@

Wires should be kept six inches away from metal vent connectors on a gas appliance.

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41
Q

All of these typically have a three-pronged plugs, EXCEPT:

a. Table lamps

b. Refrigerator

c. Washing machine

d. Microwave oven

A

A

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42
Q

All of the following are common receptacle problems EXCEPT

a. worn receptacles.

b. a pin that has broken in the receptacle.

c. the receptacle being too close to the basin.

d. bathroom outlets that are too far from basins.

A

C@

The receptacle that is too close to the basin is not a problem.

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43
Q

What is the most important reason an overhead wire from the house to the garage is stranded?

a) stranded wires can carry more current

b) they have thicker insulation to handle the weather

c) they are stronger than solid wires

d) there is less likelihood of height restrictions

e) stranded wires are more flexible

A

E@

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44
Q

A properly polarized circuit

a. has the black wire connected to the silver screw on the receptacle.

b. has the neutral and ground connections bonded-together at the receptacle

c. will always be grounded.

d. will result in the threaded collar of a lamp being neutral.

A

D@

A properly polarized circuit has the lamp collar connected to the neutral.

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45
Q

Of the GFls that you find in a house, which ones must be tested?

a. All of them

b. Those at the panel

c. Exterior GFIs

d. Kitchen GFls and exterior GFIs

A

A@

All GFIs must be tested.

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46
Q

Which of the following is not an approved grounding method?

a. Metallic underground water piping

b. Metal frame of a building

c. Ground rods

d. Gas piping

A

D!

Gas piping is not an approved grounding method.

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47
Q

NMD cable is

a. rigid.

b. armored.

c. suitable for dry indoor use.

d. suitable for outdoor use but not underground.

A

C@

NMD cable is suitable for dry indoor use.

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48
Q

Almost all abandoned wires

a) are live

b) are dead

c) should be removed

d) are brittle.

e) are for future use.

A

C@

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49
Q

Putting the fuses upstream of the disconnect switch in the service box

a. makes it dangerous to change the fuses even when the house power is shut off.

b. may cause a short circuit through the fuses.

c. is a result of connecting the service conductors to the line side, rather than the load side.

d. is a result of installing the box upside-down.

A

A

Putting fuses upstream of the disconnected switch in the service box makes it more dangerous to change the fuses. Even when the house power is shut off, there will be power to the fuse terminals.

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50
Q

Implications of an undersized service include

a) shock hazard

b) fire hazard

c) shock and fire hazard

d) melting insulation

e) nuisance tripping of the main fuses or breakers

A

E

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51
Q

The standard house voltage is

a. 100 A.

b. 120 v.

c. 120/208 v.

d. 120/240 v.

A

D!

The standard house voltage is 120/240 V.

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52
Q

What is the frequency (cycles/second) of household electricity?

a. 60 Hz

b. 50 Hz

c. 30 Hz

d. 66MHz

A

A

Household electricity is 60 Hertz.

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53
Q

A false ground reading on a circuit tester may be the result of

a) a ground created by accident

b) a double insulated device

c) ground wires attached to plastic water piping

d) a missing jumper wire

e) the panel not being bonded to the neutral wire

A

C@

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54
Q

When you find three-slot receptacles on ungrounded circuits, you might recommend any of the following EXCEPT

a) replace the circuit with a grounded circuit

b) run a ground wire to a metal supply-plumbing pipe that runs back to the ground

c) fill the ground hole with epoxy, if permitted by authority

d) replace the receptacle with a GFCI

e) label the circuit at the panel “ungrounded”

A

E@

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55
Q

When replacing the panel cover, it’s hard to get it back on without pinching or compressing the wires inside the box. You should conclude that

a. the panel is overcrowded.

b. the panel cover is too small for the panel.

c. the wires are probably larger than is necessary.

d. both a and c are true.

A

A!

The panel is overcrowded if you can’t get the cover back on without pinching wires.

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56
Q

Of all the different characteristics of aluminum wiring, the one that contributes the most to the overheating problem is its

a) softness.

b) fragility

c) oxidation tendency

d) lower conduction ability

e) rate of thermal expansion.

A

C@

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57
Q

What is a type P fuse?

A) A gfci fuse

B) A heat sensitive fuse

C) A “power” fuse, for 30A or more loads

D) A time-delay fuse

A

B!

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58
Q

The top end of an service entrance cable service

a. should be bent into a U-shaped drip loop before removing the cable sheathing.

b. should not be clamped within 36 inches of the top.

c. should have a gooseneck before the splice.

d. must be spliced to the service drop at least 3 feet from the side of the house.

A

C

The top end of a service entrance cable should have a gooseneck before the splice.

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59
Q

Your hand-held electrical tester (the one with three lights) won’t tell you if

a) there is an open hot wire

b) there is an open neutral wire

c) there is a false ground

d) a receptacle is properly wired

e) a receptacle is grounded

A

C@

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60
Q

After entering the service box, the neutral service entrance conductor should

a. connect to the terminal with the grounding electrode conductor and the service neutral.

b. connect to the main breaker.

c. go directly to the distribution panel.

d. connect to the main fuses on the line side.

A

A!

The neutral service entrance conductor should connect to the terminal with the grounding conductor and the service neutral.

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61
Q

Common copper wire sizes for an electric water heater are

a. #12 and#10.

b. #16 and #8.

c. #16 and#18.

d. #10and#8.

A

A

Common wire sizes from water heaters are 12-guage and 10-guage.

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62
Q

Service entrance cable must be securely clamped to the house

a. using brass clamps and screws.

b. every 12 inches, using rustproof fasteners.

c. every 6 feet.

d. every 30 inches, generally.

A

D

Service entrance cable should be clamped to the house ever 30 inches, generally.

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63
Q

You plug your circuit tester into an outlet that has a washing machine plugged in. Your tester shows the outlet is properly wired and grounded. How could you improve this inspection process?

A) Use a circuit tester with a GFI test button

B) Use a voltage tester

C) Turn the washing machine on before doing your test

D) Unplug the washing machine

A

D@

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64
Q

The term service drop defines

a. the underground wires from the utility, to the point of connection, to the house.

b. the wires that connect the meter to the service box.

c. the wires that run down the outside of the house into the meter.

d. the overhead wires coming from the utility pole, to the point of connection, to the house.

A

D!

The service drop refers to the overhead wires coming from the utility pole to the house.

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65
Q

Circuit breakers

A) protect inhabitants by limiting shock duration.

B) regulate power to the attached equipment.

C) protect the wire from an electrical overload.

D) measure the current in a circuit.

A

C

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66
Q

Assuming copper, standard wire type, and normal temperature rating, what is the typical conductor size (in AWG) for a 200-A service in the United States?

a. #2

b. 1/0

c. 2/0

d. 3/0

A

C

A 200-amp service must have 2/0-gauge wire in the United States.

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67
Q

What is the definition of an ohm?

(a) An ohm is a measure of a conductor or insulator (R=V/I).

(b) An ohm is a measure of energy to electrical flow in a conductor or insulator (R=V/I).

(c) An ohm is a measure of resistance to electrical flow in a conductor or insulator (R=V/I).

(d) An ohm is a measure of resistance to electrical resistance in a conductor or insulator (R=V/I).

A

C

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68
Q

The grounded plugs (three-prong plugs) became standard for all branch circuits in the

a) 1930s

b) 1940s

c) early 1950s

d) early 1960s

A

D

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69
Q

White wires can sometimes act as black wires

a. in 240-volt circuits.

b. in multiwire branch circuits.

c. by design on a reverse polarity circuit.

d. on a dedicated circuit for a clothes dryer.

A

A@

White wires can sometimes act as black wires in 240-volt circuits.

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70
Q

A house has service entrance conductors designed for 100 amps and a main disconnect rated at 100 amps. Which of these conditions is unsafe?

A) The distribution panel is rated at 125 amps.

B) The service box is rated at 125 amps.

C) The service box is rated at 75 amps.

D) The distribution panel is rated at 200 amps.

A

C

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71
Q

What is the MINIMUM electrical service drop clearance from a residential driveway?

A) 12 feet

B) 13 feet

C) 15 feet

D) 18 feet

A

A

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72
Q

What are the I (current) and R (resistance) values for a circuit with four 60-watt light bulbs and a 360-watt television?

a) I=5A, R=600 ohms

b) I=12A, R=72 ohms

c) I=24A, R=5 ohms

d) I=2.5A, R=48 ohms

e) I=5A, R=24 ohms

A

E!

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73
Q

Which of the following may indicate an amateurish wiring installation?

a) staples securing wire every 4 feet

b) standoffs used on metal studs.

c) staples missing where wires run through studs

d) staples where cables change direction

e) two wires secured under one staple

A

E@

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74
Q

These are all possible causes of an inoperative outlet, EXCEPT:

a. Reversed polarity

b. Outlet is defective

c. Blown fuse

d. Power is off

A

A

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75
Q

In a modern house, how far apart should be electrical outlets to be located?

a. 3 feet

b. 4 feet

c. 6 feet

d. 12 feet

A

D

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76
Q

A fire hazard may exist in all of the following scenarios EXCEPT

a) a 16 gauge extension cord on a 20 amp circuit

b) 14 gauge wire with a 30 amp fuse

c) two 10 amp appliances on a 15 amp breaker

d) a 30 amp fuse substituted on a 15 amp circuit

e) an extension cord stapled under a carpet

A

C@

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77
Q

Knob-and-tube wiring wouldn’t be anticipated in a house built much after

a) 1935

b) 1940

c) 1945

d) 1950

e) 1955

A

D@

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78
Q

You notice rust in the service panel. Which of the following may be the cause?

a. No drip loop

b. Undersized conduit

c. Damaged masthead

d. Both a and c.

A

D!

Undersized conduit can’t be the cause of water getting into the electrical system

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79
Q

If the service entrance conduit is 2 inches, what conclusions can you draw as to the size of the electrical service?

a. You would suspect a service greater than 100 A, but would have to confirm elsewhere.

b. The service is 200 A.

c. The service is 100 A.

d. The service conduit is oversized.

A

A!

The size of the conduit is not a reliable indicator of the service size. This would be common for a 200-amp service, but they could run smaller wires in the conduit.

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80
Q

The purpose of an isolating link on a pull chain light is to

a) prevent the fixture from overheating

b) allow multiple units to be installed on the same circuit

c) prevent the chain from conducting electricity

d) permit the fixture to operate at either 120 or 240 volts

e) allow the fixture to be operated with or without a wall switch

A

C@

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81
Q

Which of these wires is a home inspector required to inspect?

a. Telephone wiring

b. Security wiring

c. Cable television wiring

d. Wiring for a clock receptacle

A

D@

We are required to inspect the wiring for a clock receptacle.

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82
Q

Panels used with aluminum wire should

a. be circuit breaker rather than fuse-type.

b. contain at least 20 branch circuits.

c. be rated CUAL

d. be rated CO/ALR

A

C@

Panels used with aluminum wires should be ranted CUAL.

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83
Q

Number 10 gauge wires are typically used for all of these except

a) air conditioners.

b) clothes dryers

c) dishwashers.

d) cooktops

e) saunas.

A

C@

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84
Q

What is the definition of a volt?

(a) A volt is the measure of the energy in an electrical system (V=IxR)

(b) A volt is the measure of the force or potential energy in an electrical system (V=IxR)

(c) A volt is the measure of the resistance or potential energy in an electrical system (V=IxR)

(d) A volt is the measure of the flow or potential energy in an electrical system (V=IxR)

A

A

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85
Q

A quick way to check for aluminum wire is

a) look at the panel label for a CUAL designation

b) look at the ground wires in the panel

c) note the size of the sheathing (aluminum is thicker)

d) look for a stamp on the breaker

e) bend a cable (aluminum will bend more easily)

A

B@

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86
Q

Electrical receptacles in bathrooms should be

A) GFCI protected.

B) at least 3 feet away from showers and bathtubs.

C) not more than 2 feet from the vanity basin.

D) waterproofed.

A

A

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87
Q

Which of the following is a reliable way to identify the service size?

A) The distribution panel rating

B) The size of the service drop wires

C) The service entrance conduit size

D) The service entrance conductor size

A

D

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88
Q

GFCI receptacles

a) protect all of the receptacles upstream in the same circuit

b) are best tested with a circuit analyzer with a GFCI test button

c) only work on grounded circuits

d) are accepted as an alternative for grounding under some circumstances

e) perform exactly the same function as grounding

A

D@

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89
Q

These are all problems specific to fuses except

a) fuses bypassed

b) different fuse and panel manufacturer

c) fuses loose

d) fuse holder broken

e) no links on multi-wire circuit fuses

A

B!

A difference between fuse manufacturer and panel manufacture is not a problem.

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90
Q

The smallest gauge wire (copper) normally used in a house is

a) 3

b) 8

c) 10

d) 12

e)14

A

E@

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91
Q

As a general rule, how much clear space should be in front of the service box?

a. One foot

b. Three feet

c. Five feet

d. Six feet

A

B!

There should be three feet of clear space in front of a service box.

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92
Q

The function of bonding is to

a. ensure that two electrical conductors are at the same potential.

b. ensure an electrical conductor is at zero potential.

c. provide a primary path for ground faults from the electrical system.

d. ensure that the black and red conductors are at the same potential.

A

A!

The function of bonding is to ensure that two electrical conductors are at the same potential (not necessarily zero).

93
Q

Which rooms typically have AFCIs?

a. Laundry rooms

b. Outdoor sheds

c. Bedrooms

d. Attic

A

C

94
Q

Lights are generally required in all of the following EXCEPT

a) the top and bottom of a stairway

b) a front hall closet

c) on entering a room

d) a walk-in closet.

e) an exterior entry door

A

B@

95
Q

The grounded service conductor

a. is called the neutral.

b. connects to the water pipe and/or the ground rod.

c. cannot be aluminum.

d must be bonded to the gas piping.

A

A

The grounded service conductor is the neutral.

96
Q

All of the following are common outdoor wiring problems EXCEPT

a. NMW wiring used outdoors.

b. garage door openers powered with an extension cord.

c. unprotected wires within 4 feet of the garage floor.

d. wires running through downspouts.

A

A@

NMW wire used outdoors is not a problem.

97
Q

A #6 gauge cable supplies a subpanel. The cable is protected by 60-amp breakers at the main panel. You should make sure that

a) the cable is protected in a ventilated metal raceway

b) it is not an aluminum conductor cable

c) the cable is in rigid conduit

d) the cable is no longer than 3 feet

e) the subpanel is rated to handle at least 60 amps

A

E!

98
Q

To check the connections of the wires inside the service box, you should

a) use a screwdriver to test the screw tightness

b) measure the amperage in the neutral

c) pull on the wire

d) measure the voltage between the neutral and the ground

e) look for melting, charring or damage to the wire and insulation

A

E!

99
Q

Electrical resistance

a. increases with increasing wire diameter.

b. decreases with increasing wire diameter.

c. decreases with increasing wire length.

d. is higher for copper than for aluminum.

A

B!

100
Q

If a neutral (white) wire is used as a hot wire, it should be

a) written up in a report for replacement

b) one size larger for the given amperage

c) clearly identified on the fuse panel

d) installed with the appropriate connector

e) identified with black tape

A

E@

101
Q

All of these are common closet lighting problems except

A) bare bulbs are used.

B) installing the light above and toward one end of the shelf.

C) the light is above a shelf.

D) the light is mounted on a wall above the door.

A

D@

102
Q

What is a brief definition of a watt?

(a) A watt is a measure of the rate of electrical energy being held. (P=VxI).

(b) A watt is a measure of the rate of electrical condensation being consumed or released (P=VxI).

(c) A watt is a measure of the current of electrical energy being consumed or released (P=VxI).

(d) A watt is a measure of the rate of electrical energy being consumed or released (P=VxI).

A

A

103
Q

The wire size used in household circuits fused at 15 amps is

a) #14 gauge

b) #12 gauge

c) #10 gauge

d) #8 gauge

e) #6 gauge

A

A!

104
Q

A multi-wire circuit has

A) protection from circuit breakers, not fuses.

B) a red and a black wire.

C) two neutral wires.

D) two ground wires.

A

B!

105
Q

The sheathing on knob-and-tube wiring was typically

a) plastic

b) rubber

c) cloth

d) paper

e) non-existent.

A

C@

106
Q

An ungrounded conductor is

a. uninsulated.

b. called the neutral.

c. usually white in color.

d. often called the hot conductor.

A

D!

An ungrounded conductor is often called the hot conductor.

107
Q

What is the correct fuse or breaker size for 14 gauge AWG copper wire?

a. 15 amps

b. 20 amps

c. 30 amps

d. 40 amps

A

A

108
Q

Which of the following is a safety issue?

A) The service box has a higher rating than the service entrance wire.

B) The main fuses have a lower rating than the service entrance wire.

C) The distribution panel has a larger rating than the service entrance wire.

D) The main fuses have a higher rating than the service entrance wire.

A

D

109
Q

In general, modern 120V circuits can accommodate how many outlets and/or light fixtures?

A) 8

B) 16

C) 12

D) 10

A

C!

110
Q

Which of the following devices are most likely to be rated CO/ALR?

a. Receptacles

b. Wire nuts

c. Panels

d. Breakers

A

A@

Receptacles are most likely to be rated CO/ALR.

111
Q

An inexpensive alternative to using a CO/ALR receptacle is

a) rewire the house with copper wire

b) ‘pigtail’ the outlet with a copper wire

c) use a power bar or similar

d) replace the plug on the lamp or device that is being plugged in

e) lower the breaker one size.

A

B@

112
Q

At the drip loop you notice that the service drop conductors are smaller in diameter than the service entrance conductors. You should conclude that

a. it was a faulty installation and should be corrected.

b. the service entrance conductors must be aluminum, and report them as such.

c. the house service must be 200 A.

d. this is a normal situation and is acceptable.

A

D

The service drop conductors can be smaller than the service entrance conductors because the service drop conductors are in free air, whereas the service entrance conductors are in cable or conduit.

113
Q

A ground fault occurs when

A) too many devices are used on a circuit.

B) a hot conductor touches another hot conductor.

C) a hot conductor touches a grounded surface or grounding conductor.

D) a grounded conductor comes in contact with a grounding conductor.

A

C

114
Q

Wires should not be run across the tops of ceiling joists because

a) they should be buried in insulation instead

b) they should never be in the attic in the first place

c) they will be easy to step on

d) it’s much easier to run them through the joists

e) none of the above.

A

C@

115
Q

A panel is servicing an indoor pool area, and is in a mechanical room next to the pool. You should be looking for

a) stranded wires

b) rust problems

c) minimum 20A breakers

d) wires rated at 12 gauge

e) fuses, not breakers

A

B!

116
Q

Which one of the following is NOT a cause of a loose or damaged breaker?

a. Manufacturing defect

b. Undersized wire

c. Rough handling

d. Wear and tear

A

B

An undersized wire won’t cause a loose or damaged breaker.

117
Q

A 100-A service for a 1,000-square-foot house with 3 bedrooms, an electric stove, an electric dryer, a 2-ton central A/C unit (FLA= 12 amps),and two 1,500-W, 240-volt electric baseboard heaters would be considered

a. clearly inadequate.

b. adequate for no more than two adults.

c. most likely adequate.

d. clearly oversized.

A

C

A 100-amp service in a single family, three-bedroom home with an electric stove and clothes dryer, a two-ton-air-conditioning unit, and two 1,500-watt electric baseboard heaters is probably adequate. Keep in mind that the air-conditioning unit and the electric baseboard heaters would not likely be used at the same time.

118
Q

Most of the knobs and tubes in knob-and-tube wiring systems were made of

a) ceramic

b) wood

c) metal.

d) fiberglass

e) Bakelite (plastic)

A

A@

119
Q

All of these are common lighting problems EXCEPT

a. light fixtures that are damaged.

b. lights above closet shelves.

c. lights that are missing.

d. lights above stairwells.

A

D@

Lights above stairwells are not problems.

120
Q

Knob-and-tube wire buried in insulation

a. is not permitted in some jurisdictions if the insulation is combustible.

b. ensures the wires won’t come in contact with each other.

c. is never permitted.

d. may be more prone to attack by pests than wires above insulation.

A

A@

Knob and tube wiring buried in insulation is not permitted in some jurisdictions if the insulation is combustible.

121
Q

If a panel has a CUAL rating

a) it should be updated to a CO/ALR rated panel if the wiring is all aluminum

b) it should be updated to a CO/ALR rated panel if there is a mix of wire types

c) it should be updated to a CO/ALR rated panel if there is visible overheating

d) it should be updated to a CO/ALR rated panel if the breakers are CO/ALR rated

e) there is no need to update the panel

A

E@

122
Q

If a light is inoperative, the best strategy is

a) try a different light bulb

b) look for another switch

c) check for a tripped breaker

d) look for an obvious loose wire

e) note the condition and move on

A

E@

123
Q

Subpanels are

a. prohibited in bathrooms.

b. prohibited in clothes closets.

c. prohibited on building exteriors.

d. both a and b.

A

D!

Subpanels are prohibited in bathrooms and clothes closets.

124
Q

Which of the following suggests an improperly supported service drop?

a) rusting conduit

b) water in the service panel

c) no seal on meter

d) missing drip loop

e) PVC conduit bulging between the meter and the elbow at the base

A

D!

125
Q

What size aluminum wire would be used in a place of a #14-gauge copper?

a. 8

b. 10

c. 12

d. 14

A

C

126
Q

The outlet that is the least likely to show any sign of overheating is the one that is

a) wired with aluminum

b) used with push-in (backwired) terminals

c) in the bathroom

d) in the living room

e) on the kitchen counter

A

D@

127
Q

If the sheathing on a cable says ALCOA, ALCAN or some other aluminum company

a) the house was likely built in the 1960s

b) the wire will be aluminum

c) the wire could be copper

d) the panel should be checked for compatibility

e) there is a higher possibility of a problem

A

C@

128
Q

A BX cable running from the electrical panel to the furnace would be an example of

a) high voltage wiring

b) low voltage wiring

c) safety wiring

d) distribution wiring

e) critical circuit wiring

A

C@

129
Q

The goal of our electrical inspection is to ensure that

a) the house meets modern codes

b) there are GFCIs everywhere they are called for

c) the electrical system is safe and convenient for modern lifestyles

d) the system has adequate capacity for expansion

e) there are at least 16 branch circuits

A

C

130
Q

Aluminum wiring is still used on

a. 12-guage circuits

b. 8-gauge circuits

c. 10-guage circuits

d. commercial applications only

A

B@

Aluminum wiring is still used on #8-guage circuits. Stranded aluminum wire is still common. That includes wires that are #8-guage and larger.

131
Q

Three slot receptacles on ungrounded circuits are safety hazards because

a. people will use grounded appliances, thinking the receptacle is grounded.

b. people may try to put three appliances, rather than two, into the duplex receptacles.

c. computers may not be able to dissipate static charges.

d. radio devices won’t be able to use the ground wire as an antenna.

A

A@

Ungrounded three-slot receptacles are a problem because people might use grounded appliances and expect the receptacle to be grounded.

132
Q

If you used a multimeter to measure the current in a 3000W electric water heater that uses both of the ungrounded (“hot”) service conductors, it would read

a) 25A

b) 240V

c) 12.5A

d) 120V

e) 1500A

A

C!

133
Q

Which of the following is the accepted way for a home inspector to check for a loose connection of a wire to a fuse or breaker

a) measure the temperature of the bare end of the wire

b) See if the connection screw can be tightened any more

c) Look signs of overheating on the end of the wire and at the connection point

d) Turn the breaker off or remove the fuse to find an outlet that it serves, then turn it back on and measure the voltage at the outlet

A

C

134
Q

The wire that connects the system neutral to the water supply, well casing, or ground rods is called the

a. grounding electrode conductor.

b. grounded conductor.

c. electrode.

d. ground fault interrupter.

A

A

The grounding electrode conductor is the wire that connects the system neutral to the water supply, well casing, or ground rods.

135
Q

Which of the following is a suitable location for a branch circuit wire?

a. Attached to a baseboard with suitable staples every four feet.

b. Under carpets

c. Within one inch of the face of a stud.

d. Stapled to two-by-four studs.

A

D@

Branch circuit wires can be stapled to 2 x 4 studs.

136
Q

Overhead service entrance conductors must:

a. have a min clearance above only the overhanging portion of a roof at least 18 in.

b. Be configured into an effective drip loop at the weather head

c. Not be unduly vulnerable to physical damage by overhanging tree branches

d. Be physically separated from each other at weather head

e. All the above.

A

E

137
Q

Common branch circuit wire materials include all of these EXCEPT

a. copper.

b. aluminum.

c. solder-dipped copper.

d. silver-dipped copper.

A

D@

Silver-dipped copper wires are not made, as far as anyone knows.

138
Q

All of these are common receptacle problems EXCEPT

a. damaged receptacles.

b. loose receptacles.

c. overheated receptacles.

d. GFI receptacles used outdoors.

A

D@

GFI receptacles used outdoors are not problems. In fact, that is the most desirable outdoor receptacle.

139
Q

All of the following are common lighting problems except

A) heat lamps over doors.

B) lights with pull chains with no isolating links.

C) closet lighting located on the wall above the door.

D) conventional lights used in wet areas.

A

C@

140
Q

In a distribution panel, a black wire and a red wire are connected to separate breakers that are four breakers apart, on the same bus bar. Both wires are part of the same cable. The neutral from the cable connects to the neutral bus. The potential problem with this arrangement is that

a. the 240-V appliance may not operate properly.

b. the breakers may not be linked.

c. the neutral wire may overheat.

d. all of the above are true.

A

D!

The problem is that the 240-volt appliance may not operate properly, because both wires are on the black bus. The breakers may not be linked. The neutral may overheat if the black and red wires are on the same bus.

141
Q

Which one does NOT defeat the ground wire connected to a water supply/plumbing system?

a. Connecting to an abandoned pipe

b. A dielectric connector

c. A jumper across the meter

d. Plastic piping

A

C

A jumper across the meter does not defeat the grounding system. It ensures that it is continuous.

142
Q

Supports for branch circuit wires are needed

a. every 3 feet.

b. only where wires may be exposed to mechanical damage.

c. within 12 inches of leaving a box.

d. only where the wires are run horizontally.

A

C@

Branch circuit wires should be supported within 12 inches of leaving a box.

143
Q

A damaged or nicked wire is a safety hazard because

a. the damaged wire may corrode.

b. the effective diameter of the wire has been decreased, thereby decreasing the resistance of the wire.

c. the effective resistance of the wire is increased so the fuse can no longer adequately protect the wire from overheating.

d. the wire is more likely to break.

A

C!

A damaged or nicked wire is a problem because the resistance of the wire is effectively increased where it is nicked. The fuse will not adequately protect that part of the wire from overheating.

144
Q

Plastic sheathing on branch wiring became popular in the

a. 1950s.

b. 1960s.

c. 1970s.

d. 1980s.

A

C@

Plastic sheathing on branch wiring became popular in the 1970s.

145
Q

The best location for an outlet is

a. on a floor.

b. immediately beside a basin in a bathroom.

c. immediately beside a bathtub in a bathroom.

d. 6 inches to 12 inches above a garage floor.

A

B@

Outlets should be immediately beside a basin in a bathroom.

146
Q

An ungrounded receptacle may be replaced by a ground fault circuit interrupter (GFCI) installed

A) on the same phase as the receptacle.

B) upstream from the receptacle.

C) downstream from the receptacle.

D) anywhere in the receptacle branch circuit

A

B

147
Q

If an auxiliary panel has been added, the wires connecting it to the service panel are protected by

a. overcurrent protection provided in the service panel.

b. overcurrent protection provided in the auxiliary panel that is sometimes allowed, so long as the feeder wire is in rigid conduit.

c. a drip loop.

d. both a and b.

A

D!

The protection for wires servicing an auxiliary panel is ideally in the service panel. Fuses or breakers can be in the auxiliary panel as long as the wire powering the auxiliary panel is in rigid conduit and is reasonably short (five feet in some jurisdictions).

148
Q

The primary reason that aluminum wire became more widely used than copper was

a) easy installation

b) availability of aluminum components

c) its wider availability compared to copper

d) its superiority to copper

e) its cost

A

E@

149
Q

One way to identify if a light is suitable for a shower or other wet area is to

a) look for the CSA or UL label that identifies it as such

b) check for the appropriate type of light bulb

c) see if the light is on a GFCI circuit

d) note any rust on the fixture that would indicate it is suitable

e) look for a heavy gasket around the diffuser

A

E@

150
Q

The size of the fuse should be

a) larger than the rating of the wire

b) the same as the rating of the wire

c) smaller than the rating of the wire

d) based on the total load of the circuit

e) the same as the wire rating for 120-volt circuit and twice the rating of the wire for a 240-volt circuit

A

B

151
Q

You notice that the service drop and service entrance conductors are bare at the splice. You should do which of the following?

A) None of these

B) Report this as a safety hazard.

C) Consider this acceptable if the conductors are secure.

D) Wrap them in tape, if you carry any.

A

B

152
Q

Which of the following is not an appropriate place to terminate a grounding system?

a. Buried grounding plates or rings

b. Under ground

c. Metal water supply pipes

d. Metal siding of buildings

A

D

Metal siding on buildings cannot be used to ground an electrical system. Some jurisdictions require that the siding be bonded to the electrical system, but that is different.

153
Q

You observe #6-gauge copper wires entering a service box with two 60 A fuses inside. From the service box, #3 copper conductors lead to a newer combination panel that has a 100 A main breaker. You should report the service size as

a. 100 A.

b. 160 A.

c. 60 A.

d. 120 A.

A

C

This is a 60-amp service, limited by the service entrance conductors and the main fuses. It doesn’t matter what is downstream of that.

154
Q

Can gas piping be used to ground the electrical system?

a. Yes

b. Yes, if there is no other grounding electrode available

c. Only if the main plumbing pipe is plastic

d. No

A

D!

Gas piping cannot be used to ground the electrical system.

155
Q

Loose connections

a. may start fires.

b. are never located in junction boxes.

c. are never found in panels

d. are common only with aluminum wiring.

A

A@

Loose connections may start fires.

156
Q

The biggest issue with recessed lights (potlights) is

a) their potential as a fire hazard

b) even in small numbers they can trip breakers

c) when installed poorly, much heat can escape into the attic

d) that newer halogen units cannot be mixed with older incandescent types

e) their transformers are not compatible with most dimmer switches

A

A@

157
Q

Overhead service wires must

a. be 3 feet away from windows, in most areas.

b. clear a flat roof by 3 feet or. more, in most areas.

c. not be run over decks under any circumstances.

d. be at least 10 feet above a driveway.

A

A!

Overhead service wires roust be 3 feet away from windows.

158
Q

Following the grounded conductor from the service box toward the street, you would find that it connects to

a. the ground rod for the house.

b. the utility’s transformer.

c. the main water pipe.

d. the meter.

A

B!

The grounded or white conductor goes to the utility’s transformer. From there it goes down, typically through a grounding wire at the base of the pole, and into a ground rod located there.

159
Q

Twist-on connectors (wire nuts)

a. replace junction boxes.

b. are not permitted on knob-and-tube wiring.

c. are also called solderless connectors.

d. should be used only on soldered connections.

A

C@

Wire nuts are also called solderless connectors.

160
Q

Putting a penny in a fuse holder is dangerous because

a. the penny will melt, causing a short circuit.

b. the penny will corrode, leading to overheating.

c. the circuit has no overcurrent protection.

d. the fuse receptor will react with the copper in the penny, causing it to degrade.

A

C!

Putting a penny in a fuse holder means that the circuit has no overcurrent protection.

161
Q

Common junction box problems include all of the following EXCEPT

a. wire nuts inside boxes.

b. missing boxes.

c. boxes missing cover plates.

d. overcrowded boxes.

A

A@

Wire nuts should be found inside boxes.

162
Q

How deep should underground service wires be buried?

a. 2 to 3 feet

b. 3 to 4 feet

c. 4 to 5 feet

d. 5 to 6 feet

A

A

163
Q

When looking at a recessed light (potlight) you see the letters IC. This means it is

a. for incandescent bulbs only.

b. to be used on interior ceilings only.

c. for use in insulated ceilings.

d. not designed to be left on continuously, and is designed for intermittent control.

A

C@

A pot light rated IC is intended for use in insulated ceilings.

164
Q

Overheating is commonly caused by any one of these EXCEPT

a. a defective fixture.

b. oversized bulbs.

c. bulbs installed with the base down.

d. a damaged wire.

A

C@

Overheating is not likely to be caused by bulbs installed with base down. This is the optimum arrangement for incandescent bulbs. The fixture and bulb are more likely to overheat if installed with the base at the top.

165
Q

A service box with a black wire, a red wire, a white wire, and two 200A fuses indicates a

A) 120/240V, 400A service.

B) 120/240V, 200A service.

C) 120V, 200A service.

D) 120V, 400A service.

A

B!

166
Q

Three-way switches control

a. lights from three different locations.

b. lights from two different locations.

c. three or more light fixtures.

d. two or more light fixtures.

A

B@

Three-way switches control lights from two different locations.

167
Q

What would two wires entering the service weatherhead indicate to you?

a. A three-phase system

b. An older 120-V system

c. A 100-A service

d. A 240-V system

A

B!

Two wires entering the service head indicates a 120-volt system.

168
Q

What valuable information can be obtained by looking at the electrical meter of the house?

a. The service amperage

b. The maximum service that the house can support

c. None

d. The age of the house

A

C!

No valuable information can be obtained by looking at the meter.

169
Q

Wires should be kept

a. tight against heating ducts or pipes.

b. at least one inch away from heating ducts or pipes

c. at least two inches away from heating ducts or pipes.

d. at least nine inches away from heating ducts or pipes.

A

B@

Wires should be kept at least one inch away from heating ducts or pipes.

170
Q

A good practice when installing wires is to

a) run wires under carpets for protection from foot traffic or vacuums

b) install cables through ductwork when possible for shorter runs

c) keep wires close to ductwork or chimney vents so they remain flexible

d) secure metal plates on stud faces to protect wires from screws or nails

e) surface mount cables to low ceiling joists in basements for easy access

A

D@

171
Q

What size of copper service wires provide a house with 100 amp service?

a. 2

b. 4

c. 6

d. 8

A

B

172
Q

Which of the following aluminum wire installations is most likely to overheat

a) A receptacle that powers a television and a stereo

b) A receptacle with a computer

c) A receptacle with a washing machine

d) A receptacle with an electric heater plugged in

A

D@

173
Q

Common Standards require the inspector to -

a. observe electrical meters

b. measure the service voltage

c. describe the location of the main disconnect

d. observe the service laterals

e. measure the service amperage

A

C!

174
Q

The unit for the measure of electrical power is

a. amps.

b. watts.

c. joules.

d. kWh.

A

B!

The unit for the measure of electrical power is watts.

175
Q

A renovated house with a 100 amp service and 4 circuits will likely require

a) more circuits added

b) the existing circuits to be divided

c) a subpanel

d) larger breakers for the existing circuits

e) a larger service

A

A@

176
Q

To meet common standards, an inspector is required to

a) inspect the wiring in the garage

b) inspect the alarm system and backup

c) inspect low voltage systems

d) report on the presence of #8 gauge aluminum wiring

e) test a sample of GFCIs.

A

A@

177
Q

A fuse and its holder in the panel are hot. The possible cause is that

a. the fuse is the wrong size for the circuit.

b. the fuse was over-tightened.

c. the fuse beside the affected fuse was overtightened, causing the bus bar to bend.

d. both a and c are true.

A

C

If the fuse is hot, it may be because of a poor connection to the bus bar. This is often because the adjacent fuse was over tightened.

178
Q

Knob and tube wiring was used commonly from

a) 1920 to 1950

b) 1850 to 1880

c) 1950 to 1960

d) 1940 to 1970

e) 1890 to 1910

A

A!

179
Q

If a bathroom outlet in a newer house has no power, there is a good chance that

a) a circuit breaker has tripped

b) there is a tripped GFI upstream

c) there is a tripped GFI downstream

d) the outlet is miswired

e) the outlet is on a switch

A

B@

180
Q

Cables within six feet of an access attic hatch should be

A) rated CUAL

B) concealed below insulation

C) knob-and-tube wiring

D) protected from mechanical damage

A

D

181
Q

If polarity was important to an appliance but grounding was not, the blades on its plug

a) would be equal in width

b) the hot blade would be wider

c) the hot blade would be narrower

d) the hot blade would be thicker

e) the hot blade would be shorter

A

C@

182
Q

Light fixtures are needed in all the following locations except

A) stairwells with more than six treads.

B) on the outside of the home near every exterior door.

C) in clothes closets.

D) each room.

A

C@

183
Q

Overfusing is

a. the clipping of breaker handles so that they operate together.

b. installing too many fuse receptors into a panel, causing a potential overload.

c. installing fuses in a holder that requires two to be removed at once.

d. installing a fuse or breaker that is rated too big for the conductor.

A

D!

Overfusing is installing a fuse or breaker that is too big for the conductor.

184
Q

How much current does a 120V, 1200W hair dryer draw?

a) 144kA

b) 10A

c) 144A

d) 10W

e) 0.10A

A

B!

185
Q

Approximately what year was grounding introduced on electrical branch circuits in the home?

a. 1920

b. 1940

c. 1950

d. 1960

A

D

186
Q

The maximum number of lights and/or outlets on a 15 amp circuit is usually

a) 6

b) 8

c) 10

d) 12

e) 15

A

D@

187
Q

Double tapping is

a) an approved method of extending a service panel’s capacity

b) the term for attaching two wires to a single fuse or breaker terminal

c) the certified approach to take when installing a subpanel

d) the term for connecting two wires in a wire nut before connecting them to a fuse or breaker

e) not acceptable unless the same number of taps occur on one bus as the other

A

B!

188
Q

Which one of the following is a reliable indicator of service amperage?

A) The rating of the meter

B) The rating of the distribution panel

C) The size of the service entrance conductors

D) The size of the service drop wires

A

C!

189
Q

A 60A service

A) an be adequate in some cases.

B) is not allowed in new construction in North America.

C) is not suitable for a 240V service.

D) requires a minimum #3 awg copper wire.

A

A!

190
Q

Fused neutrals

a) should not be used in damp locations

b) should be checked by an electrician

c) cannot be used with knob-and-tube systems

d) only run on 240 volt circuits

e) should be replaced

A

E@

191
Q

In the service box, the ungrounded service entrance wires should be connected

a) to the “load” side of the main switch

b) to power the fuses first, then the switch

c) to the “line” side of the main switch

d) one to the switch, and the other to the grounding terminal

e) one to the switch, and the other to the neutral

A

C!

192
Q

On a properly wired receptacle

a) the silver screw is for the hot wire

b) there are two hot screws and one neutral screw

c) the wide slot will be live

d) the brass screws will have white wires

e) the green screw will have a bare wire

A

E@

193
Q

A GFCI is designed to trip when

a) electricity is flowing through the ground slot

b) there is an unbalanced current flow

c) there is a loose wire on the circuit

d) a circuit is overloaded

e) a damaged wire produces an arc

A

B@

194
Q

Electrical current is measured in -

a. amps

b. watts

c. joules

d. kWh

e. ohms

A

A

195
Q

You notice a wooden post as the support for the service drop. You should

A) tug on the service drop wires to make sure the mast doesn’t give.

B) check for rot, damage, or movement.

C) recommend replacing it right away with a steel mast.

D) assume that you’ll find obsolete equipment inside the house.

A

B

196
Q

Obsolete service boxes typically have

a) rusted covers

b) black covers

c) exposed terminals

d) undersized fuses

A

C

197
Q

How hot is the surface of a 100-watt incandescent bulb, typically?

a. 280°F (138 C)

b. 380°F (193 C)

c. 480°F (249 C)

d. 580°F (304 C)

A

B@

The surface temperature Of a 100-watt bulb might be 380°.

198
Q

Four service entrance conductors indicate

a. a 240-V service.

b. a three-phase service.

c. a 120-V service.

d. a 400-A service.

A

B!

Four service entrance conductors indicate a three-phase service which is beyond our scope.

199
Q

With respect to amperage ratings, the main fuses or breaker

a. must be greater than the service box rating.

b. should be sized to adequately protect the service entrance wires.

c. should be no larger than the rating of the service box.

d. must be both b and c.

A

D!

The main fuses or breakers should be sized to adequately protect the service entrance wires and should be no bigger than the rating of the service box.

200
Q

A Ground fault circuit interrupter (GFCI) is a safety device that

A) disconnects power when the grounding to the outlet is faulty.

B) detects moisture and disconnects power in wet locations.

C) disconnects the power when sensing current leakage to ground.

D) protects against electrical surges and voltage spikes.

A

C

201
Q

You see two circuit breakers linked together in a panel. One has a black wire attached to it and the other has a red wire attached to it. The cable has no white (neutral) wire. Assuming a proper installation, you are most likely seeing

a. an electric dryer circuit.

b. a 120-V dedicated microwave circuit.

c. a furnace circuit.

d. a 240-V balanced load, such as a baseboard heater.

A

D!

This is 240-volt balanced load, often an electric baseboard heater.

202
Q

What happens if the neutral wire bypasses the service box?

a. The house electrical system won’t work properly.

b. The grounding electrode conductor can’t get to the water piping and/or ground rods.

c. The neutral and grounding system will not be properly connected.

d. The ground wire will carry electricity under normal conditions.

A

C

If the neutral wire bypasses the service box, the neutral and grounding system will not be properly connected to each other.

203
Q

A 14-gauge copper wire is protected by a 20-amp fuse. You should report that

a. this is a defect, and recommend improvement.

b. this is always allowable.

c. this indicates poor wiring.

d. this may be acceptable, depending on what the circuit load is.

A

A!

A 14-guage copper wire is usually not permitted on a 25-amp fuse.

204
Q

If a knob-and-tube circuit has been extended, it is common to see

a) cloth electrical tape

b) plastic electrical tape

c) two junction boxes

d) soldered connections

e) replacement knob-and-tube wires

A

C@

205
Q

Where would a CO/ALR component most likely be required by the local electrical authority?

a) the service panel

b) a breaker

c) a 120 volt outlet

d) a120 volt light switch

e) a 240 volt outlet.

A

D@

206
Q

Openings in panels and boxes should be sealed so that people don’t inadvertently touch live electrical systems. There is another reason to keep these openings sealed. What is it?

a. To prevent insects and other pests from nesting in the panel

b. To help contain a fire inside the panel

c. To keep the panel rigid so it won’t rack – too many openings in the panel will cause it to lose rigidity.

d. Condensation is more likely to form in the panel.

A

B

Openings in panels whould be kept sealed to help keep fire inside the panel.

207
Q

Low voltage and ancillary items we don’t have to inspect include all of the following EXCEPT?

a) telephones

b) cable TV

c) washing machines

d) intercoms.

e) stereos.

A

C@

208
Q

In most areas, for what distance can service entrance wires run inside the building before going into the service box, without special permission?

a. 5 feet

b. 10 feet, if in

c. 0 feet, or as short as possible

d. Maximum of 3 feet

A

C!

Service entrance wires should not run inside the building. Some rules say no distance is permitted. Other rules indicate that they should ba as-short-as-possible.

209
Q

The wire size used in household circuits fused at 15 amps is

a. #14-gauge copper.

b. #12-gauge aluminum.

c. #10-gauge tinned copper.

d. both a and b.

A

D!

Typically household circuits are 14-guage copper or 12-guage aluminum.

210
Q

The main service fuses have been installed with the labels facing backward, not allowing you to read their rating. No other markings are visible. You should

a) turn off the house power and remove a fuse to check its rating

b) measure the diameter of the fuse body to determine its rating

c) report that the main service fuse rating was not determinable

d) carefully insert your inspection mirror until the label is visible, then read the rating from the label

e) report that this is a defect and recommend immediate repair

A

C!

211
Q

The service drop wires

a. are a reliable indicator of service size.

b. are usually the homeowner’s responsibility.

c. connect to the house at the drip loop.

d. must always be in conduit.

A

C!

Service drop wires join the house at the drip loop.

212
Q

What size of copper service wires provide a house with 200 amp service?

a. 4

b. 2

c. 1

d. 2/0

A

D

213
Q

If a house has cloth-sheathed cables with a ground wire, it may have been built in

a) 1949

b) 1959

c) 1969

d) 1979

e) 1989

A

C@

214
Q

What is the main purpose of the fuses and/or circuit breakers?

a. To allow lights to be controlled from two different locations

b. To shut-off the circuit when too much current is flowing

c. To provide grounding from the main panel

d. To indicate the size of the wire to the fuse/breaker

A

B

215
Q

Which of the following is not a common service amperage?

A) 100A

B) 175A

C) 60A

D) 400A

A

B!

216
Q

Aluminum branch circuit wiring was commonly used from

a) 1920 to 1950

b) 1980 to 1988

c) 1965 to 1978

d) 1940 to 1958

e) 1950 to 1968

A

C!

217
Q

All of these are functions of grounding systems EXCEPT

a. protection of homeowners.

b. providing an emergency path for electricity to escape.

c. dissipation of static charges.

d. prevention of short circuits.

A

D

Grounding does not prevent short circuits.

218
Q

Why are some main switches sealed by the utility?

a. For safety

b. To prevent air leakage

c. To· prevent tapping of power prior to the meter

d. Both a and c.

A

D

Switches are sealed by the utility company to ensure safety, to prevent tampering, and to stop people stealing electricity upstream of the meter.

219
Q

Which statement is correct?

A) Neutral and ground wires should be connected at the main panel and separate at subpanels.

B) Hot and neutral wires should always be the same color.

C) Ground and neutral wires should always be connected.

D) Neutral and ground wires should be connected at subpanels and separate at the main panel.

A

A!

220
Q

What do you call the wire that connects the system neutral to the water supply, well casing or ground rods?

a) the grounded conductor

b) the grounding electrode conductor

c) the electrode

d) the ground fault interrupter

e) the UFER

A

B!

221
Q

Assuming copper, standard wire type, and normal temperature rating, what is the typical conductor size (in awg) for a 125A service?

a. #3

b. #2

c. 1/0

d. 2/0

e. 3/0

A

B

222
Q

A subpanel is supplying a 3-ton air conditioner (running load amps = 18A) and an electric dryer (5000W). The 10 gauge copper subpanel feed wire is connected to a 60A breaker in the main panel. You should

A) recommend changing the size of the feed wire to match the breaker.

B) recommend changing the size of the breaker to match the feed wire.

C) recommend switching to a gas dryer.

D) report the installation as okay.

A

A!

223
Q

Fused neutrals

a. provide enhanced protection for the neutral wire.

b. will never trip because the voltage drop across a neutral wire is negligible.

c. are required on multiwire branch circuits.

d. are dangerous.

A

D@

Fused neutrals are dangerously poor practice.

224
Q

GFCIs are commonly found in all of these areas, EXCEPT:

a. Bedrooms

b. Bathrooms

c. Kitchens

d. Exterior

A

A

225
Q

Grounded and grounding conductors must be connected at

A) all subpanels.

B) the service panel only.

C) all possible locations.

D) all boxes and panels.

A

B!

226
Q

An overcurrent protection device

a. can be a fuse or breaker.

b. regulates voltage in a circuit

c. usually indicates an obsolete panel.

d. refers to the plastic washers installed in fuse sockets.

A

A

An over-current protection, device can be a fuse or breaker.

227
Q

Original knob-and-tube connections

a. were always in metal junction boxes.

b. employed solder.

c. should all be replaced.

d. were always concealed.

A

B@

Original knob and lube connections employed solder.

228
Q

An electrical system with a fuse on the neutral conductor and on the energized (hot) conductors

A) is twice as safe as a system where only the energized (hot) conductors are fused.

B) should have the neutral conductor fuse sized to one half the normal ampacity for the circuit.

C) is overfused up to 50% if used only for lighting.

D) is hazardous and should be corrected

A

D

229
Q

Abandoned wires should be

a) terminated in junction boxes

b) secured tightly against joists or studs

c) capped with wire nuts and tape

d) removed

A

D@

Insulation (12 decks)

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