Section 5—Pre-energizing Checkout Procedure
Power-Style™ QED-2 Switchboards
37
© 1988–2018 Schneider Electric All Rights Reserved
80043-055-13
ENGLISH
15. Examine fuse clip contact pressure and contact means
(QMB/QMJ/QMQB
1
fusible switches). If there is any sign of looseness,
contact Schneider Electric Services at 1-888-778-2733 (US) or
1-800-565-6699 (Canada). Loose fuse clips can result in overheating.
16. Check all QMB/QMJ/QMQB
1
fusible switches, verifying that the proper fuses
with the required interrupting rating and continuous current rating are installed.
Do not use renewable link fuses in Square D™ brand fusible switches.
17. Verify that all grounding connections are correctly made. If the switchboard is
used as a service entrance, double check to see that the main bonding jumper
is connected (Figure 18 on page 27).
18. Conduct an electrical insulation resistance (Megger
®
) test to ensure that the
switchboard is free from short circuits and undesirable grounds.
a. Open all control power and metering disconnects or remove the fuses from
the control circuits.
b. Disconnect the neutral connection at any surge protective device or other
electronic device before performing the electrical insulation resistance test;
reconnect to the device after the test.
c. With the neutral isolated from the ground and the power switches and circuit
breakers open, conduct electrical insulation tests from phase-to-phase,
phase-to-ground, phase-to-neutral, and neutral-to-ground.
d. If the resistance reads less than one megohm while testing with the branch
circuit devices in the open position, the system may be unsafe and should
be investigated.
e. Consult Schneider Electric Services at 1-888-778-2733 (US) or
1-800-565-6699 (Canada) to help correct any problems.
19. After completing the electrical insulation resistance test, replace all control power
fuses that were removed and close power disconnects that were opened.
20. Check all field-installed wiring. Make certain it is clear of all live parts, and when
instructed, secured to withstand fault currents.
21. Verify that all control wiring between sections is connected.
22. Vacuum to remove any dust, scrap wire, or other debris.
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.
Содержание QED-2
Страница 2: ......
Страница 184: ...Panneaux de commutation Power StyleMC QED 2 62 FRANÇAIS 1988 2018 Schneider Electric Tous droits réservés 80043 055 13 ...
Страница 185: ...Panneaux de commutation Power StyleMC QED 2 63 1988 2018 Schneider Electric Tous droits réservés 80043 055 13 FRANÇAIS ...
Страница 187: ......