BASIC NEC CODE RULES AND DESIGN PRACTICE

All power must be shut off with a maximum of 6 hand movements. The main breakers in Panels A and B, plus the individually mounted breaker for panels C and D, can be shut off with 4 hand movements. Panels C and D require ungrounded neutrals, and separate grounding bars. A separate grounding wire must be run from the wire gutter to each subpanel ... ................
................