Junction Box Straight Pull
Junction Box Pull Box Straight Pull
The dimension of a pull box required for various types of pulls is covered
in the National Electrical Code.
A straight pull is one where conductors enter a box on one side, then exit
through the opposite side without a splice. The raceway enclosing the conductors
do not need to line up in a straight line, or any other way. Here are three
examples of straight pulls:
The distance from one side of the box to the other side of the box must be
at least eight times the trade diameter of the largest raceway containing these
conductors. Where more than one raceway is on one side of a box, the box is
sized on the basis of eight times the largest raceway on that wall plus the
trade size of any other raceways on that same wall. Which ever side ends up with
the larger calculated value prevails to determine the eight times minimum
Note: There is no stipulation in the NEC about the other dimensions of the
box. So looking at the below diagram, here are the rules:
a dimension (left to right) eight times largest raceway containing same
b dimension (top to bottom) no requirement except to accommodate locknuts or
c dimension (front-to-back) depth) no requirement except to accommodate
locknuts and hubs.
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Note the audio support relates to the practice problems just above this line.
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