# Number of wires per box?

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

WHY are you using #10, and why are there so many?
using 10 gauge for a run of 350 ft. with 5 receptacles. Using a carlon fs box E979DFN.
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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.
what size box would i need for 9 10-gauge wires plus receptacle?
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.
1
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
350' is a loooong run- your wire is sized too small, even for a 5 amp load
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