confused on box fill

[bigbird2]

i need an answer to a test question that i didn`t understand.---------question------the cubic inch of a outlet box with 1 hickey + 2 straps is decreased by-------A) 2 --- B) 3 --- C) 4 --- D) amount of conductors intering box. hope someone can help-----DECREASED has me stumped.

 

[augie47]

314.16(B)(2) says one or more internal clamps requires a single volume allowance
314.16(B)(3) says one or more hickeys are preasent, a single volume allownace is required

1 single + 1 single= 2

 

[Dennis Alwon]

when you deal with box fill you have to deal with the volume. If the volume of the box is 22 cu. in athen 11 #14 can enter the box because you must use 2.0 cu.in for each wire. 2.0*11= 22 cu.in.

Now if there is a device in the box then the volume must be decrease by 2 #14. If there is a clamp you must decrease by another #14 and so on. Thus with a device and a clamp the total # of 14 gauge wires has been reduce by 3 . This leaves 8 #14 wires (11-3=8)

 

[infinity]

What is a strap?

 

[1793]

What is a strap?

I'm thinking a device of some sort.

 

[480sparky]

What is a strap?

The metal strap that a device is held to the box with. AKA yoke.

This may help.

 

[Dennis Alwon]

What is a strap?

I was thinking clamp....

 

[infinity]

The metal strap that a device is held to the box with. AKA yoke.

This may help.

If it's really a yoke then that would require a 2 conductor deduction not one. So all of the previous calculations are incorrect.

 

[480sparky]

This is what I call a strap.

 

[infinity]

This is what I call a strap.

Does article 314 recognize the word strap when referencing conductor deductions in boxes?

 

[480sparky]

does article 314 recognize the word strap when referencing conductor deductions in boxes?

314.15(b)(4).

 

[Dennis Alwon]

Its a bad question. If it were a strap for a device then the answer would be 5 but there is no choice for that answer. My guess is A) 2.

 

[infinity]

314.15(b)(4).

Thanks, I didn't have the book in front of me and didn't remember if it actually used the word "strap". So I agree that since it's 2-straps and one hickey the reduction is 5 conductors.

 

[joebell]

Trick ?

Trick ?

Could it be a trick question? 314.15(B)(4) says "For each yoke or strap containing one or more devices or equipment". The question in the OP mentions nothing about a device associated with the strap ie receptacle or switch.

Joe

 

[joebell]

BTW welcome to the forum


Joe

 

[wirebender]

314.15(b)(4).

In 2005 and 2008 it is 314.16(B)(4).
Yabba-Dabba-Doo

 

[480sparky]

In 2005 and 2008 it is 314.16(B)(4).
Yabba-Dabba-Doo

You are correct. My keyboard can't read the codebook very well.:wink: