Chapter 39 Hardware procedures 229
Multiservice Switch 7400 Hardware Installation, Maintenance, and Upgrade 6.1S2
Grounding a dc-powered Multiservice Switch 7460
Ground Nortel Networks Multiservice Switch equipment to protect both
personnel and equipment.
Prerequisites
• Ensure that you have read and fully understood the grounding
requirements, as described in NN10600-170 Nortel Networks
Multiservice Switch 7400 Hardware Description. If you use a terminal in
your installation, you must ground both the outlet that provides power to
the terminal and the cabinet or rack to the same distribution panel.
• The remote alarm panel and any termination panels (sparing panel or
fanout panel) must share the same site ground window as the device.
• Have an antistatic wrist strap available so that it can be worn to protect
processor cards as soon as the device is grounded.
Procedure steps
1 Connect the green/yellow ground lead (NTBP63) to the stud located
beside the power input terminal block on the rear of the shelf assembly.
The nut on the stud is a #8-32. See the figure
“Grounding a dc-powered
Multiservice Switch 7460” (page 229).
This wire must be the only wire secured by the nut provided. If you require
other grounds, attach the wires above the first ground nut and add another
nut to secure them.
2 If the device is in a cabinet, connect the other end of the grounding lead
to a grounding nut on the cabinet. See the figure “Grounding a
Multiservice Switch 7460 to the site ground window” (page 230).
If the device is or will be in a standard 19” rack, connect the other end of
the grounding lead to a ground point on the rack provided the rack is also
grounded to the site’s dc ground window. Ensure that bare metal contacts
the lug of the grounding cable.
3 Dress the cable with tie-wraps to keep it away from servicing equipment,
for example, termination panels that are mounted at the rear of a cabinet.
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