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EBK ELECTRICAL WIRING RESIDENTIAL

19th Edition
Simmons
ISBN: 9781337516549

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EBK ELECTRICAL WIRING RESIDENTIAL

19th Edition
Simmons
ISBN: 9781337516549
Textbook Problem

Two 12-2 AWG and two 14-2 AWG nonmetallic-sheathed cables enter a box. Each cable has an equipment grounding conductor. The 12 AWG conductors are connected to a receptacle. Two of the 14 AWG conductors are connected to a toggle switch. The other two 14 AWG conductors are spliced together because they serve as a switch loop. The box contains two cable clamps. Calculate the minimum cubic-inch volume required for the box.

To determine

Find the required minimum volume of a box in cubic-inch.

Explanation

Given data:

Consider that four 12 AWG conductors, four 14 AWG conductors, two receptacles, and two switches are located in the box.

Consider two equipment grounding conductors and the box that contains two clamps.

Calculation:

Consider that 12 AWG and 14 AWG conductors require 2.25 cu.in. and 2.00 cu.in., respectively.

Receptacle and the switch require a space of 2.25 cu.in. and 2.00 cu.in., respectively.

Calculate the total cubic inches needed.

Four 12 AWG conductors require a volume of 4×2.25cu.in.=9.00cu.in..

Four 14 AWG conductors require a volume of 4×2.00cu.in.=8.00cu.in..

Four equipment grounding conductors, count as one, it requires a volume of 1×2.25cu.in.=2.25cu.in..

Two clamps, count as one, it requires a volume of 1×2.25cu.in.=2.25cu.in..

Two receptacles require a volume of 2×2.25cu.in.=4.50cu.in.

Two switches require a volume of 2×2.00cu.in.=4.00cu.in.

Therefore, the total required volume of the box is,

9.00cu.in

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