DIY Builds
DIY Builds
Photo: Laura James
As a rule of thumb, pull boxes are used when conductors are pulled straight through a box and terminated down-stream. On the other hand, junction boxes can be used for splicing or tapping conductors. Field experience has taught electricians that it is not wise to skimp on the size or number of boxes needed in a run.
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You’re reading an outdated article. Please go to the recent issues to find up-to-date content. An electrician asked me a very interesting question concerning the sizing of a junction or pull box and the difference between the two. They are basically the same. Electricians use junction and pull boxes as access points for pulling and feeding conductors through raceway systems. In many installations, use of boxes is necessary, or there would be a greater number of offsets, saddles and bends between outlets or fittings than are permitted per the National Electrical Code (NEC).
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Learn More »Angle pulls consist of conductors entering one side and leaving from any side other than the opposite. Angle pulls are determined in a different manner than straight pulls. Section 370.28(A)(2) requires the width of a pull or junction box to be at least six times the trade diameter of the largest raceway plus the sum of the remaining raceways on the same wall. Be careful, the dimensions of the locknuts or locknuts of fittings plus the bushing of the connected raceways involved should determine the depth of the box. Considering an angle pull, if the enter and exit walls contain raceways of 3, 2 and 1 in. respectively, multiply 3 inches by 6, and add 2 inches and 1 inch. That equals 21 inches. Therefore, the size box for an angle pull is 21 inches by 21 inches. As another rule of thumb to size a box for an angle pull, multiply the largest of the raceways by 10. Doing this will provide the extra space needed for the fittings connecting raceways to the wall of the box. When calculating the size pull or junction box for different size conductors rated 6 AWG or smaller, the cubic inch rating of each conductor from Table 370.16(B) must be selected and multiplied by the number of conductors based on each cubic inch rating. This total cubic inch rating is then used to size the box. For example, an 8-by-8-by-4-inch box is capable of housing conductors (combination of conductors 6 AWG or smaller) with a calculated cubic inch rating of 256.
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