GE MM3 Instruction Manual page 23

2 INSTALLATION
q) DIELECTRIC STRENGTH TESTING
It may be required to test a complete MCC with MM3s installed for dielectric strength. This is also known as
"flash" or "hipot" testing. The MM3 is rated for 1800 V AC for 1 minute or 2200 V AC for 1 second isolation
between switch inputs, relay outputs, VT voltage input, supply voltage inputs and Ground Terminals 21 and 48.
When performing dielectric tests, the connection to the surge ground terminal (22) must be removed. A filter
network is used on the AC input to filter out RF and EMI noise. The filter capacitors and transient absorbers
could be damaged by the high voltages relative to surge ground on the AC input.
Under no circumstances should any inputs other than switches, relays, supply voltage, VT
input, and CT inputs be dielectric tested.
CAUTION
GE Power Management MM3 Motor Manager 3
2.3 INPUTS AND OUTPUTS
2
2-7