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    Junos Pulse Gateway Electrical Safety Guidelines and Warnings

    In Case of Electrical Accident

    If an electrical accident results in an injury, take the following actions in this order:

    1. Use caution. Be aware of potentially hazardous conditions that could cause further injury.
    2. Disconnect power from the Junos Pulse Gateway.
    3. If possible, send another person to get medical aid. Otherwise, assess the condition of the victim, then call for help.

    General Electrical Safety Guidelines and Warnings

    • Install the Junos Pulse Gateway in compliance with the following local, national, or international electrical codes:
      • United States—National Fire Protection Association (NFPA 70), United States National Electrical Code
      • Canada—Canadian Electrical Code, Part 1, CSA C22.1
      • Other countries—International Electromechanical Commission (IEC) 60364, Part 1 through Part 7
      • Evaluated to the TN power system
    • Locate the emergency power-off switch for the room in which you are working so that if an electrical accident occurs, you can quickly turn off the power.
    • Do not work alone if potentially hazardous conditions exist anywhere in your workspace.
    • Never assume that power is disconnected from a circuit. Always check the circuit before starting to work.
    • Carefully look for possible hazards in your work area, such as moist floors, ungrounded power extension cords, and missing safety grounds.
    • Operate the Junos Pulse Gateway within marked electrical ratings and product usage instructions.
    • For the Junos Pulse Gateway and peripheral equipment to function safely and correctly, use the cables and connectors specified for the attached peripheral equipment, and make certain they are in good condition.

    Grounded Equipment Warning

    Warning: The Junos Pulse Gateway is intended to be grounded. Ensure that the Junos Pulse Gateway is connected to earth ground during normal use.

    Midplane Energy Hazard Warning

    Warning: High levels of electrical energy are distributed across the Junos Pulse Gateway midplane. Be careful not to contact the midplane connectors, or any component connected to the midplane, with any metallic object while servicing components installed in the Junos Pulse Gateway.

    Multiple Power Supplies Disconnection Warning

    Warning: The Junos Pulse Gateway has more than one power supply connection. All connections must be removed completely to remove power from the unit completely.

    Power Disconnection Warning

    Warning: Before working on the Junos Pulse Gateway or near power supplies, unplug the power cord from an AC-powered Junos Pulse Gateway; switch off the power at the circuit breaker on a DC-powered Junos Pulse Gateway.

    TN Power Warning

    Warning: The Junos Pulse Gateway is designed to work with TN power systems.

    Copper Conductors Warning

    Warning: Use copper conductors only.

    DC Power Electrical Safety Guidelines and Warnings

    When working with DC-powered equipment, observe the following guidelines and warnings:

    • DC Power Electrical Safety Guidelines
    • DC Power Disconnection Warning
    • DC Power Grounding Requirements and Warning
    • DC Power Wiring Sequence Warning
    • DC Power Wiring Terminations Warning

    DC Power Electrical Safety Guidelines

    The following electrical safety guidelines apply to a DC-powered Junos Pulse Gateway:

    • A DC-powered Junos Pulse Gateway is equipped with a DC terminal block that is rated for the power requirements of a maximally configured Junos Pulse Gateway. To supply sufficient power, terminate the DC input wiring on a facility DC source capable of supplying at least 65 A @ –48 VDC for the system, or at least 48 A @ –48 VDC for each power supply. We recommend that the 48 VDC facility DC source be equipped with a circuit breaker rated at 60 A (–48 VDC) minimum, or as required by local code. 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. 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.
    • Run two wires from the circuit breaker box to a source of 48 VDC. Use appropriate gauge wire to handle up to 60 A.
    • A DC-powered Junos Pulse Gateway 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.

      Note: 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 Junos Pulse Gateway and the supply side of the DC wiring.
    • The marked input voltage of –48 VDC for a DC-powered Junos Pulse Gateway 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 Junos Pulse Gateway is a positive ground system, you must connect the positive lead to the terminal labeled RETURN, the negative lead to the terminal labeled –48V, and the earth ground to the chassis grounding points.

    DC Power Disconnection Warning

    Warning: Before performing any of the following procedures, ensure that power is removed from the DC circuit. To ensure that all power is off, locate the circuit breaker on the panel board that services the DC circuit, switch the circuit breaker to the OFF position, and tape the switch handle of the circuit breaker in the OFF position.

    DC Power Grounding Requirements and Warning

    An insulated grounding conductor that is identical in size to the grounded and ungrounded branch circuit supply conductors, but is identifiable by green and yellow stripes, is installed as part of the branch circuit that supplies the unit. The grounding conductor is a separately derived system at the supply transformer or motor generator set.

    Warning: When installing the Junos Pulse Gateway, the ground connection must always be made first and disconnected last.

    DC Power Wiring Sequence Warning

    Warning: Wire the DC power supply using the appropriate lugs. When connecting power, the proper wiring sequence is ground to ground, +RTN to +RTN, then –48 V to –48 V. When disconnecting power, the proper wiring sequence is –48 V to –48 V, +RTN to +RTN, then ground to ground. Note that the ground wire should always be connected first and disconnected last.

    DC Power Wiring Terminations Warning

    Warning: When stranded wiring is required, use approved wiring terminations, such as closed-loop or spade-type with upturned lugs. These terminations should be the appropriate size for the wires and should clamp both the insulation and conductor.

    Published: 2011-07-25