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Working on a project where I am planning a 3-gang switch box. The box will be a plastic carlton super blue (53 in³). My fill-math works out fine, but I'm wondering about the practical reality of such a crowded box.

Box will contain:

  • 14/2 inbound power (4 in³)
  • 14/2 outbound switched-power to fixtures (4 in³)
  • 14/2 outbound switched-power to fixtures (4 in³)
  • 12/3 outbound to another switch box (6.75 in³)
  • 12/3 inbound from another switch box (6.75 in³)
  • 2 dimmer switches 14AWG (8 in³)
  • 1 4 way switch 12AWG (9 in³)

Total: 42.5 in³

If I did the math right - it seems to add up - but that's a lot of stuff - plus it seem odd to me that a dimmer that takes up a lot of volume is the same fill as a basic pole switch.

Am I going to have a hard time getting that all in and should I consider breaking up the switch boxes.

Note - that the 12 AWG is putting a 4 way into an existing branch that was wired with 12 AWG. 14 AWG is on a new circuit.

David K
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BlueGoldfish
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1 Answers1

6

Dimmers do tend to be bigger than simple single pole switches. But if the fill calc is correct then it should be manageable— 53 cu in is a lot.

RibaldEddie
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