In an industrial plant, a 600V, 3-phase feeder is to be installed in a raceway. What is the minimum size of the raceway required according to 318.30(A)?
- AAlways 1.5 inches
- BAlways 2 inches
- Insufficient information to determine a minimum raceway size
- DAlways 3 inches
Where to look it up
Explicit exercise assumptions; not a universal code requirement.
Why C is correct
Voltage and phase count alone do not establish the required raceway size. Selection needs the actual conductors, their dimensions and arrangement, the raceway type and applicable installation requirements. The stem omits those details, so a fixed minimum cannot be selected.