Sizing depth of pull boxes

J

JKemp22

Member
Location
Wisconsin
Occupation
Electrical Engineer
Hello all, I am a new engineer. I am looking to size a pull box with a straight pull and was wondering about sizing the depth of the box. I understand the calculation for sizing the length and depth of the box as laid out in 314.28(A)(1), however, I was wondering if there is a code reference for calculating the depth of the box.
 
There is no calculation when using the 8X straight pull rule. The box only needs to be deep enough to enter the raceway and install the locknuts and bushings if applicable. For example a 6" deep box could just fit a 4" raceway (OD 4½") in it.

Welcome to the Forum.
 
It's probably a case of semantics but if it's simply a straight pull we normally used a "wireway" vs a "pull box" since depth and width were governed only by the conduit size.
 
augie47 said:
It's probably a case of semantics but if it's simply a straight pull we normally used a "wireway" vs a "pull box" since depth and width were governed only by the conduit size.
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Funny you mentioned that. :cool:
I was going to say something about a wireway but we always used pull boxes even in standard wireway sizes. Custom welded pull boxes are much stronger than wireways. I've seen wireways get crushed when using a pulling machine.
 
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