PTX5000 DC Power Electrical Safety Guidelines
The following electrical safety guidelines apply to a DC-powered router:
A DC-powered router that is equipped with a DC terminal block is intended for installation only in a restricted access location. In the United States, a restricted access area is one in accordance with Articles 110-16, 110-17, and 110-18 of the National Electrical Code ANSI/NFPA 70.
Primary overcurrent protection is provided by the building circuit breaker. This breaker should protect against excess currents, short circuits, and earth faults in accordance with NEC ANSI/NFPA70.
Incorporate an easily accessible disconnect device into the facility wiring. In the United States and Canada, the –48 VDC facility should be equipped with a circuit breaker (see PTX5000 AC and DC PDU Electrical and External Circuit Breaker Specifications for details) in accordance with the National Electrical Code in the US and the Canadian Electrical Code in Canada. Be sure to connect the ground wire or conduit to a solid office (earth) ground. A closed loop ring is recommended for terminating the ground conductor at the ground stud.
Each –48-VDC facility DC source input power cable connected to a 60-A DC PDU must be equipped with a current-limiting fuse or circuit breaker (see, PTX5000 AC and DC PDU Electrical and External Circuit Breaker Specifications or as required by local code). The voltage rating of the facility DC source circuit breaker must be 80 V minimum. We recommend an 80 A–rated circuit breaker or current-limiting fuse for each 60-A DC power cable.
A DC-powered router is equipped with a DC terminal block that is rated for the power requirements of a maximally configured router. To supply sufficient power, terminate the DC input wiring on a facility DC source (see PTX5000 AC and DC PDU Electrical and External Circuit Breaker Specifications for details) for the 60-A DC PDU.
Run two wires from the circuit breaker box to a source of 48 VDC. Use appropriate gauge wire (see PTX5000 AC and DC PDU Electrical and External Circuit Breaker Specifications for details).