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Instructions for qualified electricians only:
Systems using –(48–60) V DC Power Supplies are intended for restricted access locations in accordance
with Articles 110-5, 110-6, 110-11, 110-14, and 110-17 of the National Electrical Code, American
National Standards Institute (ANSI)/National Fire Protection Association (NFPA) 70.
Before connecting safety ground or power cables, ensure that the power is removed from the DC circuit.
To ensure that the power is off, locate the circuit breaker on the DC source circuit (usually at the power
distribution of the battery distribution fuse bay). Switch the circuit breaker to the off position and, if
available, install an approved safety locking device on the circuit breaker or switch.
While grounding techniques may vary, a positive connection to a safety (earth) ground is a requirement.
When installing the unit, the ground connection must always be made first and disconnected last to
prevent a hazard.
Never defeat the ground conductor or operate the equipment in the absence of a suitably installed
ground conductor. Contact the appropriate electrical inspection authority or an electrician if you are
uncertain that suitable grounding is available.