scnkapc
Member
- Location
- Northern Kentucky
First, picture this: 1000 amp main switch gear. Breaker in that gear feeding and panel. Panel feeding and disconnect mounted to the RTU on the roof of a gymnasium.
Name plate on RTU states: Maximun Fuse or HACR Breaker size: 30.
Now here is the question:
The breaker in the gear protects the feeder going to the panel, right?
The breaker in the panel protects the feeder going to the disconnect mounted on the RTU, right?
The disconnect mounted to the RTU protects the circuit wires to the components within the RTU itself, right?
So when the Unit Name Plate states that this RTU must be protected with : Max. Fuse Size or HACR breaker 30 amp, does the disconnect on the RTU have to be a fusible disconnect? Or does the breaker that is in the panel feeding the disconnect, that has HACR rating, sufficient?
It is my understanding the the disconnect mounted on or adjacent to must have fuses or house the HACR breaker. Not the remote location panel 2-stories down inside a closed.
Please clarify with code references.
Name plate on RTU states: Maximun Fuse or HACR Breaker size: 30.
Now here is the question:
The breaker in the gear protects the feeder going to the panel, right?
The breaker in the panel protects the feeder going to the disconnect mounted on the RTU, right?
The disconnect mounted to the RTU protects the circuit wires to the components within the RTU itself, right?
So when the Unit Name Plate states that this RTU must be protected with : Max. Fuse Size or HACR breaker 30 amp, does the disconnect on the RTU have to be a fusible disconnect? Or does the breaker that is in the panel feeding the disconnect, that has HACR rating, sufficient?
It is my understanding the the disconnect mounted on or adjacent to must have fuses or house the HACR breaker. Not the remote location panel 2-stories down inside a closed.
Please clarify with code references.