Help us improve your experience.

Let us know what you think.

Do you have time for a two-minute survey?

 
 

DC Power Electrical Safety Guidelines for EX4400 Switches

  • For permanently connected equipment, a readily accessible disconnect device shall be incorporated external to the equipment.

  • For pluggable equipment, the socket-outlet shall be installed near the equipment and shall be easily accessible.

  • Be sure to connect the ground wire or conduit to a solid central office earth ground.

  • A closed loop ring is recommended for terminating the ground conductor at the ground stud.

  • Run two wires from the circuit breaker box to a source of 48 VDC.

  • Ensure that the polarity of the DC input wiring is correct. Under certain conditions, connections with reversed polarity might trip the primary circuit breaker or damage the equipment.

  • Provide a 20 A 2-pole breaker or a circuit breaker as per local electrical code.

    Note:

    Primary overcurrent protection is provided by the building circuit breaker. This breaker must protect against excess currents, short circuits, and earth grounding faults in accordance with NEC ANSI/NFPA 70.