Why must device yokes and internal clamps be included in box fill?
- AThey eliminate grounding
- They occupy specified conductor-volume allowances
- CThey change circuit voltage
- DThey increase breaker poles
Why B is correct
The box-fill rule accounts for items that consume wiring space or crowd conductors, including yokes, clamps, and grouped equipment grounds. Counting insulated conductors alone can overfill the box.