Length of straight through pullbox...

[Daniel Palmquist]

Answer from 2008 NEC please,Length for straight through pull-box under 600 volts, with 4" conductor on either side? A) Any LengthB) 48"C) 24"D) 32"I have looked at Articles 312 & 314 in the code & handbook for 2008 but only see information about conduit... 314.28 (A) (1) says: Straight Pulls. In straight pulls, the length of the box shall not be less than eight times the metric designator (trade size) of the largest raceway. I don't think this is the answer however if someone can explain how this is done I would really appreciate it. Please provide the article information with the answer to my original question please. Thank you very much!

 

[infinity]

For a straight pull take the trade size of the conduit and multiply by 8. It's that simple. You've included the code reference in your post.

 

[Chamuit]

8 x 4 = 32

So, 32 x W x H

 

[Daniel Palmquist]

Thank you very much infinity! The question had the wrong information for the answer sought. It stated conductor rather than conduit or raceway - per the NEC and yes it is times 8 so a 4" raceway for a straight through pull-box would be 32 or 4" x 8 = 32" according to 314.28(A)(1).

 

[Daniel Palmquist]

The code is confusing when it states 8 times the metric designator which doesn't translate to any particular measurement. The code should instead read eight times the trade size of the largest raceway and omit 'metric designator'.

 

[maghazadeh]

For a straight pull take the trade size of the conduit and multiply by 8. It's that simple. You've included the code reference in your post.

I agree with this, I might just add, besides the example you stated here if there are more than one conduit, then take the trade size of the largest conduit multiply by 8 for straight pull and add the trde size of other conduits.

 

[Hv&Lv]

I was taught a crude way to remember this years ago. "If it dangles it's six, if it's straight it's eight". Crude, but effective...

 

[infinity]

I agree with this, I might just add, besides the example you stated here if there are more than one conduit, then take the trade size of the largest conduit multiply by 8 for straight pull and add the trde size of other conduits.

Adding the other conduits only applies to angle pulls not straight pulls.

 

[Ponchik]

8 x 4 = 32

So, 32 x W x H

What do you mean?

 

[Chamuit]

What do you mean?

Box = L x W X H

The length has to be 32" so a box with 32 by W by H.

 

[infinity]

What do you mean?

He means that the box needs to be 32" in length with the conduits entering opposite each other. 8 * 4" (trade size of conduit)= 32".

 

[Ponchik]

Box = L x W X H

The length has to be 32" so a box with 32 by W by H.

OK. Sorry for some reason i thought you meant 32 x 32 x 32. :slaphead:

Because i have heard of electricians and sometimes inspectors think that for a single straight pull all sides have to be 8 x the largest conduit.

 

[Dennis Alwon]

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