R621       *Protect circuits with appropriate circuit breakers. Each branch circuit must be protected by 1 and only 1 circuit breaker or fuse on the PDP/PDH per Table 9‑3. No other electrical load can be connected to the breaker or fuse supplying this circuit.

R624       *Use specified wire colors (mostly). All non-Signal Level wiring with a constant polarity (i.e., except for outputs of relay modules, motor controllers, or sensors) shall be color-coded along their entire length from the manufacturer as follows:

R618       *Use PDP/PDH terminals as designed. Only 1 wire shall be connected to each terminal on the PDP/PDH.

R620       *Only use specified fuses in PDP/PDH. The only fuses permitted for use in the PDP/PDH are mini automotive blade fuses (ATM style) with the following values: