Electrical
Box Fill
Verify junction or device box volume against NEC 314.16 requirements. Counts current-carrying conductors, grounding conductors, internal clamps, and device yokes using Table 314.16(B) allowances.
Safety/code-sensitive estimate. This calculator is not a substitute for licensed professional review, applicable code requirements, manufacturer instructions, field verification, permits, or inspections. Do not rely on this result as the sole basis for work that could affect life safety, fire safety, electrical safety, structural safety, public safety, property damage, code compliance, or required licensure.
Formula: Required volume = total unit count × per-conductor allowance — NEC 314.16(B), Table 314.16(B)