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7705 SAR-M Chassis Installation Guide 77
DC Power Requirements
• A means of disconnect must be provided within 10 ft (3 m) of the 7705 SAR-M.
• A circuit breaker or fuse with recommended current rating 5 A (minimum) to 10 A
(maximum) must be provided (applies to both –48 VDC and +24 VDC installations).
• The minimum AWG power conductor for the DC input connections must be based
on the application, and on the local codes, practices, and regulations applicable for
the region.
• All power cables used on the 7705 SAR-M chassis must meet local safety codes.
AC Power Requirements
• A standard 120 or 240 VAC outlet is required.
• All power cords used on the 7705 SAR-M chassis must meet local safety codes.
Cabling Requirements
Warning:
• To meet surge protection requirements, the shield on any open-ended cable must be
grounded by attaching the shield to a convenient chassis ground point, using hardware
suitable to provide a solid electrical and mechanical connection. In addition, ensure that
there is sufficient strain relief to remove any mechanical strain on the ground connection
due to cable movement.
• The intra-building port(s) of the equipment or sub-assembly is suitable for connection to
intra-building or unexposed wiring or cabling only. The intra-building port(s) of the
equipment or sub-assembly must not be metallically connected to interfaces that
connect to the Outside Plant (OSP) or its wiring. These interfaces are designed for use
as intra-building interfaces only (Type 2 ports as described in GR-1089-CORE) and
require isolation from the exposed OSP cabling. The addition of primary protectors is
not sufficient protection in order to connect these interfaces metallically to OSP wiring.
Connection to external OSP wiring must be made through an external CSU prior to
exiting the building.
• Bare conductors must be coated with an appropriate antioxidant compound before
crimp connections are made. All unplated connectors, braided straps, and bus bars
must be brought to a bright finish and then coated with an antioxidant before they are
connected.
• The 7705 SAR-M is suitable for both DC-I, DC-C, and AC power configurations.
However, when used in a DC-I configuration, the battery returns must remain isolated
until they reach the main power bus.
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