Raceway and Box Calculations Flashcards

1
Q

Primary references in the NEC for determining raceway size and conduit fill

A

Chapter 9 and Annex C

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2
Q

Reference for when multiple conductors of the same size will be installed in a raceway

A

Annex C

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3
Q

Reference for calculating raceway size based on different wires

A

Chapter 9

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4
Q

Fill percentage of a raceway when one conductor is installed

A

53%

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5
Q

Fill percentage of a raceway when two conductors are installed

A

31%

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6
Q

Fill percentage of a raceway when three or more conductors are installed

A

40%

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7
Q

Fill percentage of a nipple (>24”) long when conductors are installed

A

60%

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8
Q

Wire jamming can occur when the ration of wire size to open space in a raceway is

A

2.80 and 3.20

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9
Q

The maximum number of wires allowed into a metal wireway is limited to ____ % of the _____

A

20% of the cross sectional area

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10
Q

Table for sizing boxes with wire sizes 6awg - 18awg

A

314.16(A)

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11
Q

Table for determing volume required for wire sizes 6awg - 18awg

A

314.16(B)

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12
Q

For box fill calculations, each conductor that is spliced is counted as

A

One

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13
Q

For box fill calculations, each conductor that terminates is counted as

A

One

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14
Q

For box fill calculations, each conductor that passes through the box without a 12” loop is counted as

A

One

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15
Q

For box fill calculations, each conductor that passes through the box with a 12” loop is counted as

A

Two

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16
Q

For box fill calculations, each conductor that originates in the box, and terminates in the box is counted as

A

Zero

17
Q

For box fill calculations, one or more clamps counts as ____ and is sized based on the ____

A

One

Largest conductor entering the box

18
Q

For box fill calculations, each luminaire hickey counts as ____ and is sized based on the ____

A

One

Largest conductor entering the box

19
Q

For box fill calculations, each yoke in the boxx counts as ___ and is based on the ___

A

Two

Largest conductor terminating on the device

20
Q

For box fill calculations, each multigang yoke count as ___ per gang, and is based on the ___

A

Two

Largest conductor terminating on the device

21
Q

For box fill calculations, all EGC’s entering a box count as ___ and is based on the ___

A

One

Largest EGC entering the box

22
Q

For box fill calculations, and isolated EGC counts as ___

A

One additional

23
Q

For box fill calculations involving wire sizes 4awg and larger, Table ____ must be used

A

314.28

24
Q

For straight pulls through a junction box, the size of the junction box must not be less than ___ times the size of the largest raceway entering the box

A

8

25
Q

For angle pulls through a junction box, the size of the junction box must not be less than ___ times the size of the largest raceway plus the sum of the trade sizes of the raceway(s) on the ___

A

6

Same row/side

26
Q

For U pulls through a junction box, the size of the junction box must not be less than ___ times the size of the largest raceway plus the sum of the trade sizes of the raceway(s) on the ___

A

6

Same row/side

27
Q

For splices pulls in a junction box, the size of the junction box must not be less than ___ times the size of the largest raceway plus the sum of the trade sizes of the raceway(s) on the ___

A

6

Same row/side