Power-Style™ QED-2 Switchboards Section 8—Adverse Circumstances
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6. Turn all circuit breakers or switches to their ON position. The switchboard must
remain de-energized.
7. Use a megohmmeter with a capacity of 500–1,000 Vdc and apply voltage from:
a. Each phase-to-ground with circuit breaker on.
b. Phase-to-phase with circuit breaker on.
8. Record resistance values. Refer to “Section 10—Switchboard Insulation
Resistance Chart” on page 53.
9. If resistance measurements are less than 0.5 megohm, call
Schneider Electric Services at 1-888-778-2733 (US) or
1-800-565-6699 (Canada) for recommendations.
10. If resistance measurements are greater than 0.5 megohm, the equipment can be
energized using the procedures listed in “Section 6—Energizing the Switchboard”
on page 39.
CAUTION
HAZARD OF OVERVOLTAGE TO CONTROL AND PROTECTION COMPONENTS
• Remove the long-time rating plug before electrical insulation testing a circuit
breaker that has a label stating “Warning: Disconnect Plug Before Dielectric
Test.”
• For Masterpact™ MTZ circuit breakers, remove the voltage power supply
(VPS) module if it is present.
• Some Micrologic trip units are not rated for voltages that would occur during
electrical resistance insulation testing.
• Open all control and metering disconnects from the control circuits.
Failure to follow these instructions can result in injury or equipment
damage.
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