Number of wires per box?

899 Views 7 Replies 4 Participants Last post by mm11, Apr 14, 2016

baseballbuzz

Discussion Starter · Apr 10, 2016

How many 10 gauge wires can go into a standard size outdoor single receptacle box? I was trying to put 3 in and 6 out.

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Speedy Petey

· #2 · Apr 10, 2016

There is NO "standard" size. Exactly what box are you using.

WHY are you using #10, and why are there so many?

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baseballbuzz

Discussion Starter · #3 · Apr 10, 2016

using 10 gauge for a run of 350 ft. with 5 receptacles. Using a carlon fs box E979DFN.

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rjniles

· #4 · Apr 10, 2016

baseballbuzz said:
using 10 gauge for a run of 350 ft. with 5 receptacles. Using a carlon fs box E979DFN.

That box is not large enough, it is 19 Cu in.

For 9 #6 you need a minimum of 22.5 cu in plus 5 cu in more if the box has a receptacle.

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baseballbuzz

Discussion Starter · #5 · Apr 10, 2016

what size box would i need for 9 10-gauge wires plus receptacle?

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rjniles

· #6 · Apr 10, 2016

baseballbuzz said:
what size box would i need for 9 10-gauge wires plus receptacle?

22.5 plus 5 is 27.5 cu in.

You need 2.5 cu in for each #10 plus the receptacle counts as 2 more conductors.

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So, is this correct for box fill calculations?

Each 10 ga wire counts as one or 2.5 cubic inches
Multiple ground wires only count as one or 2.5 cubic inches
Each single outlet counts as two or 5.0 cubic inches

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mm11

· #8 · Apr 14, 2016

350' is a loooong run- your wire is sized too small, even for a 5 amp load

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