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DEDUCTIONS 6 7 BOX FILL TABLE 8 9 10 11 12 13 14 as well as clamps, fittings, or devices #18 (1.50) 9.00 10.50 12.00 13.50 15.00 16.50 18.00 19.50 21.00 Volume #16 (1.75) 10.50 12.25 14.00 15.75 17.50 19.25 21.00 22.75 24.50 Required per #14 (2.00) 12.00 14.00 16.00 18.00 20.00 22.00 24.00 26.00 28.00 Conductor #12 (2.25) 13.50 15.75 18.00 20.25 22.50 24.75 27.00 29.25 31.50 Size per #10 (2.50) 15.00 17.50 20.00 22.50 25.00 27.50 30.00 32.50 35.00 Deductions #8 (3.00) 18.00 21.00 24.00 27.00 30.00 33.00 36.00 39.00 42.00 #6 (5.00) 30.00 35.00 40.00 45.00 50.00 55.00 60.00 65.00 70.00 Calculate The Minimum Size Box Points to Remember: Example - Bell® Weatherproof Part (1) of Section 370-16(a) describes 1. No matter how many ground wires Supply power to a single switch with in detail the method of counting wires, come into a box, they only count as #14 conductors. Metal conduit will be as well as clamps, fittings, or devices one conductor within the box. used as the wire way. You must provide (i.e., switches, receptacles, combination space for four conductors and one devices) - by establishing an equivalent 2. Any wire running unbroken through the switch, totaling 6. Read across the line conductor -value for each. These values box counts as one wire. "Deductions" in the Box Fill Table to are added together to get a total number 3. Each wire coming into a splice device column 6, then read down to the mini - of conductors. The minimum size box is (crimp or twist -on type) is counted as mum cubic inches required for #14 con - the smallest one in the Box Fill Table one wire. ductor. This example requires a minimum (shown) that can accommodate that of 12.0 cubic inches. number of conductors. 4. Each wire coming into the box and connecting to a device counts as one wire of that size. 5. Where devices are mounted in the box, the total conductor count must C be increased by two for each P1, E mounting strap. FEB0 62011 LT E:NTAS int DEPARTMENT 183