Chapter 39 Hardware procedures 337
Multiservice Switch 7400 Hardware Installation, Maintenance, and Upgrade 6.1S2
Installing dc power cables onto a Multiservice Switch 7440
Install dc power cables onto a Nortel Networks Multiservice Switch 7440 to
provide input power to a power supply.
Prerequisites
• Before you install dc power cables, ensure that you have met the
appropriate power requirements. For information, see NN10600-170
Nortel Networks Multiservice Switch 7400 Hardware Description.
Procedure steps
1 Route the dc power cables to the rear of the device.
2 Secure the wires using the strain relief clip. The strain relief clip is on the
rear of the device, below the openings for the power supply terminal
blocks.
3 Determine the length of the wires you require, and cut them to the
appropriate length. Ensure that the ground wire is long enough to reach
the ground strip near the top of the device.
4 Attach wire lugs to the ends of the wires.
5 Connect the -48/60 V dc and return wire lugs to the terminal block at the
rear of the shelf assembly. See figure
“Multiservice Switch 7440 dc power
cables” (page 338).
6 Connect the cables from the disconnect device to the power source.
WARNING
Risk of injury by electric shock
Before installing any cables, ensure that the circuit
breaker at the power distribution panel is toggled off and
that the outlet is void of primary power.
WARNING
Damage to equipment; safety hazard
Protect the power feeds to the dc power supply as
described in NN10600-170 Nortel Networks Multiservice
Switch 7400 Hardware Description. Failure to protect the
power feeds can damage the equipment and pose a safety
hazard.
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