Final Exam 2 for 2020 Journeyman Electrician

Fill in the blank:

All single-phase, 125-volt 15- and 20-ampere rated receptacles located within ________ of the inside walls of a storable pool, storable spa, or storable hot tub shall be provided with GFCI protection.

20 feet

How well did you know this?

Not at all

Perfectly

What is the MAXIMUM length permitted for flexible cord used to supply an electrically operated in sink kitchen waste disposer?

36 inches

How well did you know this?

Not at all

Perfectly

Fill in the blank:

Type AC cable installed horizontally through wooden or metal framing members is considered supported and secured where such support doesn’t exceed ________ intervals.

4 1⁄2 feet

How well did you know this?

Not at all

Perfectly

Fill in the blank:

At least one 15- or 20-ampere, 125-volt, single-phase receptacle outlet NOT more than ________ above a balcony, deck, or porch walking surface shall be installed at each balcony, deck, or porch that is within 4 in. horizontally or attached to a dwelling and accessible from the dwelling unit.

6 1⁄2 feet

How well did you know this?

Not at all

Perfectly

Fill in the blank:

Where raceways contain ________ or larger insulated circuit conductors and these conductors enter a raceway in a cabinet, the conductors shall be protected from abrasion by a smoothly rounded insulating surface such as a bushing.

4 AWG

How well did you know this?

Not at all

Perfectly

Fill in the blank:

The lightning protection system ground terminals shall be bonded to the building or structure grounding electrode system. The bonding shall be ________ and to all raceways, boxes, and enclosures between the cabinets or equipment and the grounding electrode.

bonded at both ends

How well did you know this?

Not at all

Perfectly

Fill in the blank:

Where the initial protection specified in the NEC® is not sufficient for the starting current of an airconditioner motor-compressor, the rating or setting shall be permitted to be increased, but shall NOT exceed ________ of the motor-compressor rated load current or branch circuit selection.

225%

How well did you know this?

Not at all

Perfectly

Fill in the blank:

The service conductors between the terminals of the service equipment and a point usually outside the building, clear of building walls, where joined by splice or tap to the service drop or overhead service conductors are recognized as ________.

service entrance conductors

How well did you know this?

Not at all

Perfectly

What is the ampacity (current-carrying capacity) of a size 10 AWG, THHN CU conductor when there are a total of four (4) current-carrying conductors in a raceway? Assume all terminations are rated 75°C.

32 amperes

10 AWG THHN ampacity before adjusting (90°C column) = 40 amperes

40 amperes x .8 (adjustment factor) = 32 amperes ampacity
However, according to 240.4(D)(7) the overcurrent
protection is limited to 30 amperes

How well did you know this?

Not at all

Perfectly

Fill in the blank:

Additional services shall be permitted for a single building or other structure sufficiently large to make two (2) or more services necessary if permitted by ________.

special permission

How well did you know this?

Not at all

Perfectly

Fill in the blank:

Branch circuits that supply electric signs shall be considered ________ loads for the purposes of calculations.

continuous

How well did you know this?

Not at all

Perfectly

Fill in the blank:

Where a ground ring is used as a grounding electrode consisting of a size 2 AWG bare copper conductor encircling a building, buried 36 in. deep, in direct contact with the earth, the conductor is required to have a MINIMUM length of ________.

20 feet

How well did you know this?

Not at all

Perfectly

Fill in the blank:

For low voltage lighting systems operating at 30 volts or less, the output circuits of the power supply are to be rated for NOT more than ________ under all load conditions.

25 amperes

How well did you know this?

Not at all

Perfectly

Fill in the blank:

Any connections or splices in an underground installation shall be approved for such locations, and the NEC® defines an underground installation, such as the interior surface of enclosures or raceways that are installed underground are considered a ________ location.

wet

How well did you know this?

Not at all

Perfectly

What is the horsepower rating of a single-phase, 120-volt ac motor that draws 9.8 amperes of current?

1⁄2 hp

How well did you know this?

Not at all

Perfectly

Fill in the blank:

For installations of resistors and reactors, a thermal barrier shall be required if the space between them and any combustible material is LESS than ________.

12 inches

How well did you know this?

Not at all

Perfectly

Given: A trade size 3 in. electrical metallic tubing (EMT) will enter the bottom of a pull box and a trade size 3 in. flexible metal conduit (FMC) will enter the side of the box; the raceways will contain conductors of size 4 AWG or larger. What MINIMUM size pull box is required for this installation?

18 in. x 18 in

3 inches (raceway) x 6 = 18 inches

How well did you know this?

Not at all

Perfectly

Fill in the blank:

The service equipment for a mobile home is not permitted to be located in or on the exterior wall of the mobile home however, the service equipment shall be located in sight and NOT more than ________ from the exterior wall of the mobile home it serves.

30 feet

How well did you know this?

Not at all

Perfectly

Fill in the blank:

Individual unit equipment for legally required standby illumination systems are permitted to have flexible cord-and-plug connections, provided the flexible cord does NOT exceed ________ in length.

3 feet

How well did you know this?

Not at all

Perfectly

A size 10 AWG flexible Type SJ cord shall be permitted for:

a maximum of 300 volts.

How well did you know this?

Not at all

Perfectly

Fill in the blank:

All hydromassage bathtub metal piping systems and all grounded metal parts in contact with the circulating water associated with the bathtub shall be bonded together using a solid copper bonding jumper NOT smaller than ________.

8 AWG

How well did you know this?

Not at all

Perfectly

Fill in the blank:

Where a 125-volt, single-phase, 20-ampere receptacle is install in a residential laundry area, designated for the washing machine, the receptacle must be provided with ________.

both AFCI and GFCI protection

How well did you know this?

Not at all

Perfectly

Fill in the blank:

According to the NEC® the required MINIMUM burial depth of a direct burial cable run of a GFCI protected, 15-ampere, 120-volt circuit, where the cable passes directly under the residential driveway is ________.

12 inches

How well did you know this?

Not at all

Perfectly

Fill in the blank:

Where practical, conductors of dissimilar metals shall ________ in a terminal or splicing connector.

not be intermixed

How well did you know this?

Not at all

Perfectly

# Fill in the blank: Branch circuits that supply electric signs, other than neon signs, shall be rated NOT to exceed \_\_\_\_\_\_\_\_.

20 amperes

# Fill in the blank: Where the design and operation of a generator does not prevent overloading, the ampacity of the conductors from the generator terminals to the first overcurrent protection device shall NOT be less than \_\_\_\_\_\_\_\_ of the nameplate rating of the generator.

115 percent

What is the primary full-load current rating of a 3-phase, 75 kVA, transformer that is 90% efficient, with a 480-volt primary and a 208Y/120-volt secondary?

100.2 amperes ## Footnote (75 kVA x 1,000)/(480 x 1.732 x .9) = 75,000/ 748.22 = 100.2 amperes

# Fill in the blank: Cable splices are permitted in a cable tray, provided \_\_\_\_\_\_\_\_.

the splices are accessible

# Fill in the blank: Where conduit or tubing nipples having length NOT to exceed 24 inches between boxes or enclosures, the nipples shall be permitted to be filled to \_\_\_\_\_\_\_\_ of their total cross-sectional area.

60 percent

# Fill in the blank: Polyvinyl chloride conduit (PVC) larger than trade size \_\_\_\_\_\_\_\_ shall not be used.

6 inches

# Fill in the blank: Given: A 100 kVA, dry-type transformer with a 4,160-volt primary, which may be subject to be close to combustible material, is to be installed indoors. The transformer must have a clearance of at LEAST \_\_\_\_\_\_\_\_ from the combustible material.

12 inches

# Fill in the blank: Underground service conductors that are not encased in concrete and are buried 18 inches or more below grade shall have their location identified by a warning ribbon placed at LEAST \_\_\_\_\_\_\_\_ above the underground installation.

12 inches

# Fill in the blank: Electric signs shall be at LEAST \_\_\_\_\_\_\_\_ above areas accessible to vehicles unless protected from physical damage.

14 feet

# Fill in the blank: For a one-family dwelling unit, the service disconnecting means shall have a rating of NOT less than \_\_\_\_\_\_\_\_ when provided with a 240/240-volt, single-phase electrical system.

100 amperes

# Fill in the blank: Unless adequate protection such as a steel plate is provided where a cable or raceway is installed through bored holes in wood members, holes shall be bored so that the edge of the hole is NOT less than \_\_\_\_\_\_\_\_ from the nearest edge of the wood member.

1 1⁄4 inches

# Fill in the blank: Where a conduit longer than 24 inches contains two (2) ungrounded conductors, one (1) grounded conductor and one (1) equipment grounding conductor, the conduit may be filled to a MAXIMUM of \_\_\_\_\_\_\_\_ of its cross-sectional area.

40 percent

Given: Four (4) size 2/0 AWG conductors contained in a trade size 2 in. conduit enter a pull box on the “east” side. The conductors then make a U turn and exit in a trade size 21⁄2 in. conduit on the same side. What is the MINIMUM distance required, in inches, from the “east” side of the box to the opposite “west” side of the box?

17 inches ## Footnote 2.5 in. (largest conduit) x 6 = 15 in. + 2 in. (additional conduit) = 17 inches

# Fill in the blank: At LEAST \_\_\_\_\_\_\_\_ of free conductor, measured from the point in the box where it emerges from its raceway, shall be left at each junction box or outlet box for splices or connection to devices.

6 inches

# Fill in the blank: Where heating elements of electric space-heating cables are installed in ceilings they shall be separated at LEAST \_\_\_\_\_\_\_\_ from the edge of outlet boxes and junction boxes that are to be used for mounting surface luminaires.

8 in.

# Fill in the blank: A metal underground water pipe is permitted for use as a grounding electrode where the water pipe is in direct contact with the earth for at LEAST \_\_\_\_\_\_\_\_ or more.

10 feet

# Fill in the blank: Overhead spans of open conductors of not over 300 volts to ground shall have a clearance of NOT less than \_\_\_\_\_\_\_\_ over residential driveways.

12 feet

# Fill in the blank: Single-phase, 125-volt, 15- and 20-ampere, receptacle outlets installed in floors of dwelling units shall not be counted as part of the required number of receptacle outlets, if they are MORE than \_\_\_\_\_\_\_\_ from the wall.

18 inches

# Fill in the blank: Where applying the general method of calculation for dwelling units, the load for household electric clothes dryer shall be a MINIMUM of \_\_\_\_\_\_\_\_ or the nameplate rating, whichever is larger, for each dryer served.

5000 watts

# Fill in the blank: A transformer vault is required to be provided with a door sill or curb with a height of NOT less than \_\_\_\_\_\_\_\_.

4 inches

# Fill in the blank: A hazardous location where easily ignitable fibers or materials producing combustible flyings are handled, manufactured, or used, but where they are not likely to be in suspension in the air in quantities sufficient to produce ignitible mixtures is a \_\_\_\_\_\_\_\_ location.

Class III

Given: A dairy farm with a 120/240-volt, single-phase electrical system will have the following three (3) loads supplied by a common service: one 18,000 VA, one 16,000 VA and one 10,000 VA. What is the demand load, in amperes, on the ungrounded (phase) service-entrance conductors?

152 amperes ## Footnote 18,000 VA x 100% = 18,000 VA 16,000 VA x 75% = 12,000 VA 10,000 VA x 65% = 6,500 VA Total = 36,500 VA I = VA ÷ volts I = 36,500/ 240 = 152 amperes

What is the MINIMUM general lighting demand load, in VA, of an office building consisting of four (4) offices having a floor space of 20 feet x 30 feet each?

3,120 VA ## Footnote 20 ft. x 30 ft. = 600 sq. ft. per office x 1.3 VA = 780 VA 780 VA x 4 offices = 3,120 VA demand load Comment: The note directly below Table 220.12 clarifies that the 125% multiplier for a continuous load as specified in Section 210.20(A) is already included in the unit load values in the table when calculating the minimum lighting load for a specified non-dwelling occupancy.

# Fill in the blank: A circuit breaker protecting a single non-motor-operated appliance shall not exceed 20 amperes if the overcurrent rating is not marked and the appliance is rated \_\_\_\_\_\_\_\_ or less.

13.3 amperes

# Fill in the blank: Where two (2) or more single-phase household electric ranges used in an instructional program, are supplied by a 3-phase, 4-wire feeder or service, the total load shall be calculated on the basis of \_\_\_\_\_\_\_\_ the MAXIMUM number connected between any two (2) phases.

twice

# Fill in the blank: As a general rule, receptacle outlets provided for the small appliance countertop circuits in the kitchen of a dwelling, shall be located above the countertop or work surface, but NOT more than \_\_\_\_\_\_\_\_ above the countertop or work surface.

20 inches

# Fill in the blank: Outside open overhead individual conductors over 1000 volts shall be a MINIMUM size of \_\_\_\_\_\_\_\_ copper where not supported by a messenger wire when the conductor span is 60 feet in length.

6 AWG

# Fill in the blank: A hermetic motor-compressor that is protected against overloads by an inverse-time circuit breaker, shall be rated at NOT more than \_\_\_\_\_\_\_\_ of the motor-compressor full-load current.

125%

What is the MAXIMUM standard size inverse-time circuit breaker that may be used for overcurrent protection for a branch-circuit supplying a 4.5 kW, 240-volt, single phase, 30 gallon storage-type water heater?

30 amperes ## Footnote I = (4.5 kW x 1000)/ 240 volts I = 4,500/ 240 = 18.75 amperes x 150% = 28 amperes The next standard size OCP with a rating of 30 amperes should be selected

# Fill in the blank: For 120-volt, 15- and 20 ampere branch circuits, the rating of any one (1) cord-and-plug connected utilization equipment not fastened in place shall NOT exceed \_\_\_\_\_\_\_\_ of the branch circuit ampere rating.

80 percent

# Fill in the blank: Generally, where installed on the outside of a raceway, the length of the equipment bonding jumper shall NOT exceed \_\_\_\_\_\_\_\_ and shall be routed with the raceway.

6 feet

# Fill in the blank: Where abandoned communications cables are identified for future use with a tag, the tag shall be \_\_\_\_\_\_\_\_.

of sufficient durability to withstand the environment involved

# Fill in the blank: When exceptions to the NEC® are not a consideration, battery back-up exit luminaires (unit equipment) of emergency systems shall receive power from \_\_\_\_\_\_\_\_.

the same branch circuit serving the normal lighting in the area

# Fill in the blank: Unless approved for a higher voltage, surface nonmetallic raceways are NOT approved for use where the voltage is \_\_\_\_\_\_\_\_ or more between conductors.

300 volts

# Fill in the blank: Circuit breakers shall be permitted to be connected in parallel \_\_\_\_\_\_\_\_.

where factory assembled

One- and two-family dwelling unit services are required to be provided with: I. an emergency service disconnect. II. a surge-protective device (SPD).

I only

Where a device box having dimensions of 3 in. x 2 in. x 23⁄4 in. contains a receptacle outlet, how may size 12 AWG conductors are permitted to be installed in the box?

Four ## Footnote 6 size 12 AWG permitted in the box – 2 (device) = 4 size 12 AWG permitted

Given: An underground run of PVC with size 6 AWG conductors is the wiring method used to supply an air-conditioning unit that is protected by an overcurrent protective device rated 60 amperes. What is the MINIMUM size wire-type copper equipment grounding conductor that must be installed in the conduit?

10 AWG

# Fill in the blank: In compliance with the NEC®, a trade size 11⁄4 in. electrical metallic tubing (EMT) may contain a MAXIMUM of \_\_\_\_\_\_\_\_ size 4 AWG copper THWN conductors where the tubing is more than 24 inches in length.

six

# Fill in the blank: A one-family dwelling unit is to have the following fastened in place appliances installed: 1,200 VA dishwasher 4,000 VA water heater 1,150 VA garbage disposer 700 VA attic fan 1,920 VA garage door opener The demand load, in VA, on the ungrounded service-entrance conductors for the listed appliances is \_\_\_\_\_\_\_\_ when using the general method of calculations for dwelling units.

6,728 VA ## Footnote 1,200 VA dishwasher 4,000 VA water heater 1,150 VA garbage disposer 700 VA attic fan 1,920 VA garage door opener 8,970 VA connected load x 75% (demand factor) = 6,728 VA demand load

# Fill in the blank: Generally, where switches or circuit breakers are used as the main disconnecting means for a building service, they shall be installed such that the center of the grip of the operating handle of the switch or circuit breaker, when in its highest position, is NOT more than \_\_\_\_\_\_\_\_ above the floor or working platform.

6 feet, 7 inches

# Fill in the blank: A single-phase, 125-volt, 15- or 20-ampere receptacle outlet shall be installed at each residential kitchen countertop and work surface that is at LEAST \_\_\_\_\_\_\_\_ or wider.

12 inches

What is the MAXIMUM standard size overcurrent protection permitted for the protection of resistance-type fixed electric space heating equipment?

60 amperes

# Fill in the blank: Where exceptions are not a consideration, a multiwire branch circuit may supply only \_\_\_\_\_\_\_\_.

Line to neutral

# True or False: An intersystem bonding termination is NOT required to be connected to the meter enclosure only with a minimum size 8 AWG conductor.

TRUE

# Fill in the blank: The service equipment for a mobile home shall have an ampere rating of NOT less than \_\_\_\_\_\_\_\_ at 120/240-volts, single-phase.

100 amperes

# Fill in the blank: Given: A commercial building provided with a 208Y/120-volt, 3-phase, electrical system has a calculated demand load of 72,000 VA; the ungrounded service-entrance conductors must have an ampacity of at LEAST \_\_\_\_\_\_\_\_.

200 amperes ## Footnote I = 72,000/ (208 x 1.732) I = 72,000/ 360.25 I = 200 amperes

# Fill in the blank: For emergency systems, where internal combustion engines are used as the prime mover, an on-site fuel supply shall be provided with an on-premises fuel supply sufficient for NOT less than \_\_\_\_\_\_\_\_ full demand operation of the system.

2 hours

Which one of the following wiring methods is NOT approved for use in assembly locations, unless encased in concrete?

Schedule 80 PVC

In an industrial establishment, what is the MAXIMUM length of 200 ampere rated busway that may be tapped to 600 ampere rated busway, without additional overcurrent protection?

50 feet ## Footnote 600 amperes/ 3 = 200 amperes Therefore, the length of the 200 ampere busway may be 50 feet.

# Fill in the blank: Thermal insulation shall not be installed above a recessed luminaire or within \_\_\_\_\_\_\_\_ of the recessed luminaire’s enclosure unless, the luminaire is identified as Type IC for insulation contact.

3 in.

# True or False: A grain storage silo is considered a Class III, Division 2 location.

TRUE

# Fill in the blank: Where the heating, air-conditioning or refrigeration equipment is installed on the roof of a commercial, industrial, or an apartment building, a single-phase, 125-volt, 15- or 20-ampere receptacle outlet \_\_\_\_\_\_\_\_.

shall be located on the same level and within 25 ft. of the equipment

# Fill in the blank: In Class II, Division 1 locations, where pendant mounted luminaires are suspended by rigid metal conduit (RMC) or intermediate metal conduit (IMC) and a means for flexibility is not provided, the conduit stems shall have a length of NOT more than \_\_\_\_\_\_\_\_.

12 inches

# Fill in the blank: In a dwelling unit bedroom, any wall space that is at LEAST \_\_\_\_\_\_\_\_ or more in width must be provided with a general-use 15- or 20-ampere, 125-volt, single-phase receptacle outlet.

2 feet

# Fill in the blank: Where a receptacle outlet is installed on an island in the kitchen of a dwelling unit, the receptacle is required to be located NOT more than \_\_\_\_\_\_\_\_ below the work surface of the island.

12 inches

Final Exam 2 Flashcards

A second comprehensive assessment testing proficiency in NEC® codes, electrical calculations, and installation standards to ensure mastery and preparedness for the Master Electrician 2020 exam.