O&M Manual –90E1720004
Section 11 Insulation Resistance Chart Page 49 of 52
Section 11 Insulation Resistance Chart
Always use a 500 or 1000 VDC megohm meter when testing insulation resistance.
Note: The Neutral–Ground column is provided to record the results of the pre-energizing
checkout procedure only.
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH
Turn off all power supplying the switch before testing
Always use a properly rated voltage sensing device to confirm
power is off.
Failure to follow these instructions will result in death or serious
injury.
Phase-Phase Phase-Ground Neutral-Ground
All Disconnects Open
Date
A-B B-C C-A A-Ground B-Ground C-Ground Neutral-Ground
All Disconnects Closed
Date
A-B B-C C-A A-Ground B-Ground C-Ground Neutral-Ground
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