Outlet box sizing

[daleuger]

It's been known to happen ...the "props" not being the good stuff for game day, but rather misc. material fashioned in rudimentary game playing tools. :wink:

Ha....been guilty of that more than once.

 

[celtic]

Ha....been guilty of that more than once.

Say it ain't so.... :grin: :grin: :grin:

I think many of us are guilty of "indulging" in a sporting event "during hours".

 

[stars13bars2]

Who said the required volume is 23.5 inches? According to my calculation, 25.75 inches is required.

 

[jumper]

Who said the required volume is 23.5 inches? According to my calculation, 25.75 inches is required.

show your math. i got 23.5.

 

[stars13bars2]

Did you include a ground wire?

 

[JohnJ0906]

2008 NEC. exam. preparation book, pg. #134. Q. What is the minium size square outlet box req'd. for one 14/3 nm. cable that terminates on a 3 way switch, and one 12/2 nm cable that terminates on a receptical? The box has internally installed cable clamps. total volume required is 23.5 ins.
My question is, Why the 4 x 2 1/8 box, (30.3 cu. in. ) and not the 4 11/16 box at 25.5 cu. ins.?

Thanks

Who said the required volume is 23.5 inches? According to my calculation, 25.75 inches is required.

14-3 and 3 way switch = 5 conductors @ 2 cu in = 10 cu in

12-2 and receptacle = 4 conductors @ 2.25 = 9 cu in
EGC = 2.25
cable clamp = 2.25

Total - 23.5 cu in.

 

[stars13bars2]

The box has internally installed cable clamps. copied and pasted from original post.

 

[jumper]

Did you include a ground wire?

here is my math, maybe I am wrong:
3 ccc 14# 3*2=6
1 device on 14# 2*2=4
2 ccc 12# 2*2.25=4.5
1 device on 12# 2*2.25=4.5
clamp fill= 2.25
grounding fill= 2.25
total=23.5
how did you do the calculation?

 

[stars13bars2]

The (s) on the end of clamp causes me to believe there is more than one. My question was where did the 23.5 come from. Was that misinformation just thrown in with the question to leed you to slaughter? If not; why didn't the question just say what min square box is required for 23.5 cu.inches?

 

[infinity]

23.5 is what I got too.

 

[JohnJ0906]

The (s) on the end of clamp causes me to believe there is more than one. My question was where did the 23.5 come from. Was that misinformation just thrown in with the question to leed you to slaughter? If not; why didn't the question just say what min square box is required for 23.5 cu.inches?

314.16(B)(2)

One allowance for clamps, no matter how many.

 

[stars13bars2]

I went back and read the requirement, and I am wrong about my clamps.

 

[celtic]

here is my math, maybe I am wrong:
3 ccc 14# 3*2=6
1 device on 14# 2*2=4
2 ccc 12# 2*2.25=4.5
1 device on 12# 2*2.25=4.5
clamp fill= 2.25
grounding fill= 2.25
total=23.5
how did you do the calculation?

Not correcting any math, just a matter of point:
Box fill does not have any bearing on or from CCC's.
CCC is applicable to derating ~ not fill.

 

[jumper]

Not correcting any math, just a matter of point:
Box fill does not have any bearing on or from CCC's.
CCC is applicable to derating ~ not fill.

Thank you for pointing that out. I appreciate it.:smile: Btw, aren"t you out playing hockey with that other guy?:roll:

 

[celtic]

Thank you for pointing that out. I appreciate it.:smile:

Terminology....we're a little anal about it here

:grin:

Btw, aren"t you out playing hockey with that other guy?:roll:

LOL....funny, I didn't think anyone was watching :smile:

 

[jumper]

Terminology....we're a little anal about it here

:grin:



LOL....funny, I didn't think anyone was watching :smile:

Not a problem, so are the people who give the exams.
Beats working all day.:wink:

 

[daleuger]

LOL....funny, I didn't think anyone was watching :smile:

Bah...told you to be quieter!

 

[kalamazoocarl]

I'm curious if the correct answer was suppose to be 4x4x 1 1/2 box which is 24ci....right?:wink: