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T1600 DC Power Electrical Safety Guidelines


The following electrical safety guidelines apply to a DC-powered router:

  • 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.

  • 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 capable of supplying at least 67 A @ –48 VDC per input for the three-input 240-A DC power supply, 48 A @ –48 VDC per input for the four-input 240-A DC power supply, or 56 A @ –48 VDC per input for the six-input DC power supply.

  • 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 rated a minimum of 125% of the power provisioned for the input in accordance with the National Electrical Code in the US and the Canadian Electrical Code in Canada.


    For the six-input DC power supply, failure to provide the required circuit breaker or current-limiting fuse for each DC power cable can cause injury or damage to equipment.

    For the six-input DC power supply, each 48 VDC facility DC source input power cable must be equipped with a current-limiting fuse or circuit breaker external to the Juniper Networks equipment rated at 80 A (–48 VDC) maximum. The voltage rating of the facility DC source circuit breaker must be 80 V minimum. We recommend an 80 A circuit breaker or current-limiting fuse rated for each 60 A DC power cable.

    We recommend that the 48 VDC facility DC source be equipped with a circuit breaker rated at 80 A (–48 VDC) minimum for the three-input 240-A DC power supply or 60 A (–48 VDC) minimum for the four-input 240-A power supply, or as required by local code.

  • Run two wires from the circuit breaker box to a source of 48 VDC. Use appropriate gauge wire to handle up to 80 A for a three-input 240-A DC power supply or 60 A for a four-input 240-A power supply.

  • A DC-powered router that is equipped with a DC terminal block is intended only for installation 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.

  • 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.

  • For personal safety, connect the green and yellow wire to safety (earth) ground at both the router and the supply side of the DC wiring.

  • The marked input voltage of –48 VDC for a DC-powered router is the nominal voltage associated with the battery circuit, and any higher voltages are only to be associated with float voltages for the charging function.

  • Because the router is a positive ground system, you must connect the positive lead to the terminal labeled RTN, the negative lead to the terminal labeled –48V, and the earth ground to the chassis grounding points.