If no part of a conductor leaves the box, it shall not be counted. In no case can the volume of the box and its assembled sections be less than the following fill calculations.Įach conductor that originates outside the box and terminates or is spliced within the box must be counted as one conductor.Ĭonductor running through the box Each conductor that runs through the box is counted as one conductor. Table 314.16(A) doesn't take into consideration the fill requirements of clamps, support fittings, devices or equipment grounding conductors within the outlet box. 2: Using Table 314.16(A), how many 14 AWG THHN conductors are permitted in a 4×1.5-inch round box? Note that insulation isn't a factor.Įxample No. This answer comes directly from Table 314.16(A), which permits nine 12 AWG conductors in this size box. The answer is (b), 4×1.5-inch square box. 1: What size outlet box is required for six 12 AWG THHN conductors and three 12 AWG THW conductors?
Let's work through a few examples to clarify the calculation.Įxample No. Note: Table 314.16(A) only applies if the outlet box contains no switches, receptacles, luminaire studs, luminaire hickeys, manufactured cable clamps, or grounding conductors, although this is unlikely. When the conductors running to the box are all the same size (insulation doesn't matter), you can use Table 314.16(A) to determine the number of conductors permitted in the outlet box or the size outlet box required for the given number of conductors. Sizing boxes when all conductors are the same size. The volume of a box includes its assembled parts, including plaster rings, industrial raised covers, and extension rings. The minimum box volume must allow for conductors, devices, and fittings. In fact, Table 314.16(A) tells you the size of the most common standard boxes and how much they can hold.
#One device plaster ring dimensions install#
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