Electrical Calculators
Box Fill
Organize conductor, clamp, device, and grounding allowances.
01
Inputs
02
Result & worksheet
22.50 in³ required — fits
Recorded summary
- Required: 22.50 in³
- Available: 22.5 in³
- Margin: 0.00 in³
Formula used
Required volume = conductor allowances + yoke allowances + internal clamp/support allowance + grounding allowanceCalculation steps
- 6 × 2.25 = 13.50 in³ conductors
- 1 × 4.5 = 4.50 in³ yokes
- + 2.25 clamps/support + 2.25 grounding = 22.50 in³
Assumptions
- Counts and allowances were determined using the adopted edition
- Pass-through, looped, spliced, and equipment grounding conductors were counted correctly
- Box volume is marked by the manufacturer or otherwise verified
Verify before use
- NEC 314.16 and the applicable volume-allowance table
- Rules for clamps, support fittings, devices, grounding conductors, barriers, and fittings
- Manufacturer box markings and listed extensions
- Special treatment for large conductors or cable assemblies