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RELATED DOCUMENTATION
General Electrical Safety Guidelines and Warnings | 47
Prevention of Electrostatic Discharge Damage | 49
AC Power Electrical Safety Guidelines | 51
DC Power Electrical Safety Guidelines | 53
DC Power Electrical Safety Guidelines
• A DC-powered device is equipped with a DC terminal block that is rated for the power requirements
of a maximally configured device.
NOTE: To supply sufficient power, terminate the DC input wiring on a facility DC source that
is capable of supplying:
• Minimum of 60 A at –38 VDC
Incorporate an easily accessible disconnect device into the facility wiring. 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 38 VDC.
• A DC-powered device 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
must protect against excess currents, short circuits, and earth grounding faults in accordance
with NEC ANSI/NFPA 70.
• 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 device
and the supply side of the DC wiring.
53
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