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Warning:
• Do not install equipment that appears to be damaged.
• The chassis and equipment rack must be properly grounded. Electrostatic discharge (ESD)
damage can occur if components are mishandled. Always wear an ESD-preventive wrist or ankle
strap and always connect an ESD strap (with banana jack) to the ESD connection socket
(grounding plug) on the front of the chassis.
• If your disconnect device is not permanently incorporated, a readily accessible disconnect device
to shut off power during servicing must be incorporated in your building's branch circuit.
Notes:
• The 7450 ESS-1 requires a minimum of one power connection to operate, but using both
connections in the AC/DC or dual DC models are recommended for redundancy.
• A 20A (max.) circuit breaker is recommended for AC power.
• In the event of a power supply failure, the entire 7450 ESS-1 chassis must be repaired or
replaced. There are no field serviceable parts.
• The equipment under test (EUT) is specified for DC-I power configurations. The battery returns
must remain isolated until they reach the main power buss.
• All bare conductors must be coated with an appropriate antioxidant compound before crimp
connections are made. All unplated connectors, braided strap, and bus bars are to be brought to a
bright finish and then coated with an antioxidant before connecting them.
• All surfaces that are used for intentionally grounding the EUT shall be brought to a bright finish
and an anti oxidant solution must be applied to the surfaces being joined.
• Non-conductive coatings (such as lacquer and enamel) must be removed from threads and other
contact surfaces to assure electrical conductivity. (Thread forming screws with paint piercing
washers may be used for this purpose during installation)
• To comply with the GR-1089-CORE, Issue 03, requirement R4-9 [31] standard for
electromagnetic compatibility and safety, all intra-building ports are specified for use with
shielded and grounded cables at both ends.
• 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
subassembly 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 or Type 4 ports as described in GR-1089-CORE, Issue 4) 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.
7450 ESS-1
AC and DC Power Connections
Page 51
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