Thread: 15 vs 20 amp circuits
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Chris Friesen Chris Friesen is offline
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Default 15 vs 20 amp circuits
wrote:

One 14/3 in - 3 allowances
One 14/3 out - 3 allowances
All grounds in box - 1 allowance
One device - 2 allowances
Internal cable clamps - 1 allowance

Total 10 x 2.00 cu in for 14 AWG = 20 cu in.

Ah...I think this is a CEC vs NEC difference. For us in Canada each #14
insulated conductor counts as 1.5 cu in, the device counts as two
insulated conductors. Pigtails, bare grounds, and cable clamps don't
count, but we have to count the number of insulated twist caps separately.

With one device, 6 insulated conductors and 4 insulated caps (one for
the ground) we're allowed to use a 15 cu in box.

Chris
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