Pull box

A

anbm

Senior Member
Location
TX
Occupation
Designer
Is pull box typically sized by contractor? i.e. underground or overhead pull box for large conduits (6 - 8 of 4"C)
hit and turn...
 
Can be but large pull boxes are usually sized on the drawings.
 
anbm said:
Is pull box typically sized by contractor? i.e. underground or overhead pull box for large conduits (6 - 8 of 4"C)
hit and turn...
Click to expand...
In most states you have to know how to size one correctly in order to get an electrical contractors license. As a designer, you know there is a foot note at the bottom of the blue prints stating everything should be done by the NEC. So if we (electricians) happen to catch one on the prints that is to small we can get a bigger one.
Or maybe we have a stack at the warehouse of a different size then the designer picked. We would have to know if it would work. (y)
 
anbm said:
Is pull box typically sized by contractor? i.e. underground or overhead pull box for large conduits (6 - 8 of 4"C)
hit and turn...
Click to expand...
For a large job where the conduit runs are designed by the engineer we typically would have our own shop drawings with the box sizes. Otherwise the guys in the field size the junction boxes. I would prefer to size my own. Often the penny pinchers use the 8X calculation to size the boxes and they're too small.
 
I saw NEC has rule to size box vertical and horizontal dimension, what's about box height? any rules?
 
raberding said:
hi - EE here. Doing retail CDs. I never put pullbox or JB sizes on drawings. Don't want to get in the way of the EC's methodology.
Click to expand...
Same here. That is means and methods. Hardly ever see a contractor run the conduits exactly as shown on plans. If the entry and exits change because of the way the EC wants or needs to run the conduits or sizing could be wrong.
 
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