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Why do you have 3 leads in one junction box?

Updated: 8/19/2019
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12y ago

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Junction boxes can have as many leads in them as required by the circuits that need splicing. The only limitations to the amount of wires in the box is the internal cubic inches. Two standard size junctions boxes are , the four inch round (15 cubic in.) deep allows 14 #14s, 12 #12s, 9 #10s, 7 #8s and4 #6s. The four inch square box (30 cubic in.) deep allows 20 #14s, 17 #12s, 13 #10s, 10 #8s and 6 #6s.

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Q: Why do you have 3 leads in one junction box?
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How many junction that transistor have?

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