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90 C120-H007-05EN
CHAPTER 6 Power Supply Facilities
(2) Interphase insulation test from the distribution panel to a directly
connected device
An interphase insulation test may not be performed on a power cable that directly
connects a device to the distribution panel. If interphase insulation testing of a direct
power cable is required, disconnect the device and power cable from each other. Also
turn off the corresponding breaker to prevent the test voltage from being applied to
devices attached to any other breaker line.
Users who wish to disconnect power cables for testing should check with the certified
service engineer, because the power cables will require subsequent reconnection and
confirmation.
(3) Interphase insulation test of the distribution network
Perform an insulation test between the distribution panel and each outlet. First unplug
all server system power cables associated with that breaker line.
Turn off the corresponding breaker in the distribution panel to prevent the test voltage
from being applied to devices attached to any other breaker line.