12. If your rack is a -48 V DC rack, with the customer's ground cable connected to
the system unit, check for 0.1 ohm or less resistance between the metal frame
and the dual ground lugs on the rack.
13. If your rack is an AC rack,
a. With the external power cable connected to the system unit, check for 0.1
ohm or less resistance between the ground lug on the external power cable
plug and the metal frame.
b. Using the appropriate probe, check for 0.1 ohm or less resistance between
the metal frame and the grounding pin on each of the power outlets on the
power distribution bus (R1, R2, R3, ...).
c. Check for the following conditions for each external device that has an
attached power cord:
1) Damage to the power cord.
2) The correct grounded power cord.
3) With the external power cord connected to the device, check for 0.1 ohm
or less resistance between the ground lug on the external power cord
plug and the metal frame of the device.
3-4 7014 Model S00 Rack Installation and Service Guide
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