Dell ME Serie Instructions page 10

or bus to which the DC supply system earthing electrode conductor is
connected.
• This equipment must be located in the same immediate area (such as adjacent
cabinets) as any other equipment that has a connection between the earthed
conductor of the same DC supply circuit and the earthing conductor, and also
the point of earthing of the DC system. The DC system must not be earthed
elsewhere.
• The DC supply source must be located within the same premises as this
equipment.
• The earthed circuit conductor between the DC power source and the earthing
electrode conductor must not be connected to switching or disconnecting
devices.
Precaution statements
This product is intended for restricted access locations (dedicated equipment rooms,
equipment closet, or the like) in accordance with the National Electrical Code, American
National Standards Institute (ANSI)/National Fire Protection Association (NFPA) 70.
Connect the equipment to a –48 V DC supply source that is electrically isolated from the
AC source (reliably grounded 48 V DC SELV source). Ensure that the –48 V DC source is
secured to earth (ground).
A readily accessible disconnect device that is suitably approved and rated must be
incorporated in the field wiring.
CAUTION: Wire the unit with copper only. Unless otherwise specified, use only 10
American Wire Gauge (AWG) wire rated minimum 90ºC (194ºF) for source and
return. Protect the –(48–60) V DC (one wire) with a branch circuit overcurrent
protection rated 30 A for DC with a high interrupt current rating.
CAUTION: When stranded wiring is required, use approved wiring termination,
such as closed-loop or spade-type with upturned lugs. These terminations are the
appropriate size for the wires and must be double crimped, one on the conductor
and one on the insulation.
CAUTION: When you install the unit, always make the ground connection first,
and disconnect it last to prevent an energy hazard.
CAUTION: 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.
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