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Electrician Year 1 > NCCR 26106-23 > Flashcards

NCCR 26106-23 Flashcards

Outlet, Device, Pull, and Junction Boxes

1
Q

Define electrical box

A

Metallic or nonmetallic boxes installed in an electrical wiring system to safely house electrical components and/or securely mount devices and electrical cables.

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2
Q

What are the three usual categories of electrical boxes?

A

Pressed steel with knockouts. Cast iron, aluminum, or brass with threaded hubs. Nonmetallic.

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3
Q

What are octagon and round boxes typically used for?

A

To mount luminaires on walls

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4
Q

What is the width of a typical octagon box?

A

4”

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5
Q

What are the typical depths of octagonal boxes?

A

1 1/4”. 1 1/2”. 2 1/8”.

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6
Q

What is the minimum depth of octagonal and round boxes?

A

1/2”

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7
Q

What does AWG stand for?

A

American Wire Gauge

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8
Q

What are the typical sizes for square boxes?

A

4” and 4 11/16”.

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9
Q

what are the typical depths of square boxes?

A

1 1/4”, 1 1/2”, and 2 1/8”

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10
Q

What is a wet location?

A

Any location subject to saturation with water or other liquids.

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11
Q

What is a damp location?

A

Any location subject to some degree of moisture, including partially protected outdoor locations and interior locations subject to a moderate degree of moisture.

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12
Q

How many conductors is a fitting worth?

A

One

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13
Q

How many conductors is a device strap worth?

A

Two

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14
Q

How many conductors is a looped conductor over 12” in the box?

A

Two

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15
Q

Up to how many grounding conductors is worth one conductor?

A

Four

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16
Q

What is the recommended height for wall recepticles?

A

15” from floor to bottom of box

17
Q

What is a pull box (or junction box)?

A

A box-like enclosure made of sheet metal. It is used in conduit runs to make it easier to pull cables from point to point in long runs.

18
Q

What length should a pull box be for a straight pull?

A

8 * the largest trade size of conduit

19
Q

What is the equation to determine the distance of conductors pulled at an angle?

A

6 * the largest conduit + the sum of all the other conduits

20
Q

What do you use to increase the capacity of an electrical box?

A

raised outlet covers

21
Q

Where are the rules for box installations in the NEC?

A

Article 314, Part II

22
Q

How deep does a pull box need to be?

A

Deep enough to allow proper installation of locknuts and bushings

23
Q

When are blank covers to be used?

A

When the box is used as a junction

24
Q

What can be used to increase the amount of usable space in a box?

A

Extension rings and outlet covers

25
Q

How do you determine the maximum number of conductors in a box?

A

Look at NEC Table 314.16(A)

Electrician Year 1 (11 decks)

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