Sufficient
space for all enclosed conductors [314.16].
In no case
[314.16].
Yes, in
fact you can also count the space provided by domed covers, extension rings, and
anything else that effectively increases the volume of the box
[314.16(A)].
Use the
volume in Table 314.16(A).
Look for
the volume on the box. If the box isn't legibly and durably marked with the
volume, you can't use it [314.16A)].
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