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.
Table 9‑3 Branch circuit protection requirements
|
Branch Circuit |
Circuit Breaker Value |
Quantity Allowed Per Breaker |
|
Motor Controller |
Up to 40A |
1 |
|
Custom Circuit |
Up to 40A |
No limit |
|
Automation Direct Relay 40A (*6M40*) |
Up to 40A |
1 |
|
Fans permitted per R501 and not already part of COTS computing devices |
Up to 20A |
No limit |
|
Spike Relay Module |
Up to 20A |
1 |
|
Automation Direct Relay 25A (*6M25*) |
Up to 20A |
1 |
|
PCM/PH with compressor |
Up to 20A |
1 |
|
Additional VRM (non-radio)/Additional PCM/PH (non-compressor) |
Up to 20A |
3 total |
|
Automation Direct Relay 12A (*6M12*) |
Up to 10A |
1 |
This rule does not prohibit the use of smaller value breakers in the PDP/PDH or any fuses or breakers within Custom Circuits for additional protection.