Allied Telesis AT-8400 Series Reference Manual page 102

Cabling and Powering on the Chassis
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6. Connect the -48 VDC feed wire to the terminal block marked -
(minus).
Warning
Safety Hazard - Check to see if there are any exposed copper
strands coming from the installed wires. When this installation is
done correctly there should be no exposed copper wire strands
extending from the terminal block. Any exposed wiring can
conduct harmful levels of electricity to persons touching the wires.
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7. Secure the tray supply cable near the rack framework using multiple
cable ties to minimize the chance of the connections being
disturbed by casual contact with the wiring. Use at least four cable
ties, separated four inches apart. Locate the first one within six inches
of the terminal block.
Note
This system will work with a positive grounded or negative
grounded DC system.
8. Ensure that the circuit breaker is in the OFF position.
9. Connect the supply-cable wires to the circuit breaker.
10. If you installed an optional redundant power supply, repeat this
procedure to attach DC wires to the second terminal block.
11. Energize the circuit breaker.
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