Electrical Flashcards

0
Q

How many wire are there from the street into a house In a 240 volt system?

A

Three wires

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1
Q

What determines the amount of electricity ( amperage) a wire can carry ?

A

Size( diameter)

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2
Q

The size of the fuses or breakers at the main disconnect will always tell you how much electricity is available to the house ?T/F

A

False

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3
Q

What Size service wire (minimum ) would be required to provide a house with 60 amp service ?

A

6 Cu

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4
Q

How is the electrical system in most older homes grounded?

A

Water supply piping

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5
Q

The ground wire should always be clamped upstream of the water Meter? T/F

A

True

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6
Q

How are the electrical systems grounded in rural properties where the well supply piping into the house is plastic?

A

Ground rods

Metal well casing

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7
Q

Breakers are safer than fuses . Any house with fuses should be upgraded to breakers. T/F

A

False

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8
Q

Fuses are more prone to be improperly sized and overloaded.

T/F

A

True

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9
Q

What is/are the most common reason for replacement of knob-and- tube wiring ?

A
  • Breakdown of the cloth covering(insulation)
  • buried in thermal insulation
  • homeowner splices and repairs
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10
Q

Name an important improvement between knob-and-tube wiring and modern cable

A

Use of grounding

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11
Q

Where are GFCI’s required in newer houses ?

A

Kitchen counters
Bathrooms
Unfinished basements
Outdoors

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12
Q

In most cases,three distribution wires connected to one fuse or breaker is acceptable. T/F

A

False

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13
Q

What is the most common electrical flaw found residentially?

A

Over fusing

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14
Q

A non- grounded receptacle within 6” of water should be replaced with?

A

GFCI
GFCI upstream from receptacle
Single pole GFCI breaker

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15
Q

Maximum number if disconnects to shut off the main panel is/are?

A

Six

16
Q

What is the correct Cu wire size for a 20 amp breaker ?

A

12

17
Q

Non- metallic sheathed cable in a attic on top of joist must be?

A

Protected within 6 feet of scuttle

Must be fastened every 4 1/2 feet

18
Q

Clothes closet -bulb ok or not ok-new construction?

A
  • Surface-mounted or recessed incandescent fixtures with completely enclosed lamps
  • surface- mounted or recessed fluorescent fixtures
  • surface-mounted incandescent fixtures can be mounted in ceiling with 12” clearance
19
Q

Sub panel requirements

A
  • Neutral and ground must be separated
  • must be bonded
  • must be isolated
20
Q

Grounding rod must be driven?

A

8 feet

21
Q

A fused neutral (neutral wire runs to a fuse) is?

A

Unsafe

22
Q

Two- conductor wiring can be used with a GFCI ? T/F

A

True

23
Q

Does a sump Pump require a GFCI ?

A

No,if it is a dedicated receptacle

24
Q

What is the minimum required clearance in front of the main electrical panel box?

A

30” wide x 36” front

25
Q

AC cable, commonly known as BX, often contains a bare aluminum wire. Which of the following statements is true regarding the wire?

A

The wire is a bonding wire and should not be connected or brought into the interior of boxes.

26
Q

When a GFCI is installed on a two- wire non- grounded system, it provides?

A

Fault protection, but not grounding protection