# Electrical Flashcards

1
Q

Service cable over public streets, roads, alleys, and parking areas with truck traffic should be what height?

A

18 feet

2
Q

If one of the the hot wires on the service is tide back, the report should state that the service is only what?

A

120 volt

3
Q

Service cable’s height over residential properties, yards, driveways, and any other parking areas should be?

A

12 feet

4
Q

A mast in excess of 3 feet above a roof surface may require?

A

Support

5
Q

A service cable going over a roof of less than 4:12 with no pedestrian traffic should be at what height?

A

8 feet, maintained for a distance of at least 3 feet in all directions from the edge of the roof

6
Q

Square meter bases: Typically found on homes from the 1950s to 1970s are rated for how many amps?

A

100-125 amps

7
Q

A service cable of 300v or less crossing over a roof surfaces area that is guarded or isolated should be what height?

A

3 feet

8
Q

A service cable’s vertical clearance to a through-the-roof raceway or approved support above the overhanging portion of the roof that is less than 4 feet measured horizontally should be what?

A

18 inches

9
Q

Service cable’s height over all walking areas, sidewalks, decks, roof surfaces and patios used by pedestrians only, measured from final grade or other accessible surfaces?

A

10 feet at the electrical service entrance, at the lowest point of the drip loop

10
Q

For a 3-phase power supply, the inspector needs to defer to?

A

A Qualified industrial or commercial electrical contractor.

11
Q

Service drop’s height over commercial parking areas?

A

18 feet

12
Q

Rigid conduit should be attached to the structure every ______ from both sides of the meter base and 5 to 6 feet along its length.

A

12 inches

13
Q

SE cable not in conduit should be attached to the building every _______ along its length and within a foot of its top and any meter can.

A

30 inches

14
Q

Type UF cable must be buried to a depth of ?

A

18 to 24 inches

15
Q

Round meter bases were common in the 1920s and 1950s are rated for how many amps?

A

60 amps

16
Q

Service drop’s height over roofs surfaces having a slope of 4:12 or greater

A

3 feet

17
Q

Rectangular meter bases are the current minimum on single-family homes and are rated?

A

200 amps and typically bear the marking “200CL.”

18
Q

SEC’s vertical clearance from sides of doors, porches, decks, stairs, ladders, fire escapes and balconies, and from the sides and bottom of windows that open

A

3 feet from the bottom, sides and front

19
Q

Which branch circuit conductors should be sized one to two sizes larger than copper?

A

Aluminum

20
Q

If a service entrance has a 200-amp supply, the minimum cable size should be what?

A

2/0 copper or 4/0 aluminum

21
Q

The maximum breaker rating ______ exceed the allowable ampacity of the conductor.

A

must not

22
Q

A service drop should be at least _______ away from any nearby trees.

A

5 to 6 feet

23
Q

An electrical service mast that extends _________ above the roof surface needs to be supported separately.

A

5 feet or more

24
Q

Rigid service masts should be secured to the structure every ________.

A

5 to 6 feet

25
Q

The typical supply for a Square brand electric meter is what?

A

100 amps

26
Q

The minimum conductor size for a 100-amp service is what?

A

4-awg copper or 2-awg aluminum

27
Q

Most areas require how many means of separate grounding?

A

2

28
Q

The minimum size for a listed, stainless steel, driven grounding rod is what?

A

5/8-inch diameter and 8 feet long.

29
Q

Which supply piping cannot be used as a grounding means?

A

Gas

30
Q

Which panel enclosures need to be bonded to ground?

A

All of them

31
Q

The grounded and grounding conductors can share a common bus in which panel?

A

The service panel.

32
Q

You can bond a remote distribution panel by connecting the enclosure to what?

A

The grounding bus

33
Q

A split-bus electrical panel uses a double-pole breaker to _____ the 120-volt circuits.

A

Isolate

34
Q

The minimum service required for a new single family home is what?

A

100 amps

35
Q

What size wire would be used for 200 amps?

A

36
Q

Most homes constructed between 1930 and 1950 originally had what size service?

A

60-amp

37
Q

Are wire splices an electrical panel defect?

A

No

38
Q

What size wire would be used for 150 amps?

A

39
Q

The available service amperage is based on what?

A

The lowest rated component.

40
Q

What size wire would be used for 100 amps?

A

41
Q

Where is a service panel not allowed?

A

Inside a bathroom, over stairs, or inside a clothes closet.

42
Q

What size wire would be used for 125 amps?

A

43
Q

Electrical service panels should be in a clear space measuring what?

A

30” wide by 78” high by 36” deep.

44
Q

What type of screws are not allowed for grounding connections?

A

Sheet metal screws

45
Q

Correct breaker types should be used for each panel-board, according to what?

A

The manufacturer’s label.

46
Q

No circuit should be identified in a way that may be subject to change with?

A

Occupancy.

47
Q

All 15- and 20-amp 120-volt circuits for dining rooms, living rooms, bedrooms, sun rooms, closets, hallways, or similar areas must be protected by?

A

AFCI

48
Q

All unused holes in the panel should be?

A

Closed.

49
Q

To isolate grounds and neutrals, subpanels should be supplied with a conductor with how many wires?

A

4

50
Q

If they are the same size, and the maximum number of conductors does not exceed the recommendations of the panel manufacturer, multiple what may be installed under the same terminal?

A

Multiple grounding conductors or “grounding wires”.

51
Q

If over-current protection is provided for the feeder conductors, the subpanel does not require a what?

A

A main breaker.

52
Q

In a subpanel, what must not be installed to the neutral bar?

A

A bonding jumper

53
Q

How many amps would a typical subpanel supplied by a feeder using #2 AL SEC cable or #4 CU SEC cable be?

A

100-amps

54
Q

Unless identified by the manufacture, how many neutral wires should be on a single terminal?

A

One.