Site Preparation
7750 SR-a4 and SR-a8 Installation Guide 63
For information about grounding the chassis and connecting the AC or DC supply, see
Chassis Ground Wiring on page 85; Installing, Wiring, and Connecting an AC PSU on page
94; and Installing, Wiring, and Connecting a –48 VDC PSU on page 98.
Cabling
Warning:
• To comply with the GR-1089-CORE, Issue 06, 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.
• Intrabuilding ports of the equipment or subassembly are suitable for connection to
intrabuilding or unexposed wiring or cabling only. Intrabuilding ports of the equipment
or subassembly must not be metallically connected to interfaces that connect to the
Outside Plant (OSP) or its wiring or to equipment in an Isolated Bonding Network (IBN)
unless the wiring passes through an SPCW as defined in GR-295. These interfaces are
designed for use as intrabuilding interfaces only (Type 2 or Type 4 ports as described
in GR-1089-CORE, Issue 06) 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. For equipment installed in an IBN, use Mesh-BN,
Mesh-IBN, or Chain-IBN. Equipment rearrangements shall maintain the existing
bonding topology.
• Bare conductors must be coated with an appropriate antioxidant compound before
crimp connections are made. All unplated connectors, braided strap, and bus bars must
be brought to a bright finish, then coated with an antioxidant before they are connected.
• The 7750 SR-a is suitable for use in DC-I, DC-C, or AC powered installations. There are
no connections between the battery returns and the chassis ground within the
7750 SR-a.
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