Section 7—Maintaining the Switchboard
Power-Style™ QED-2 Switchboards
47
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ENGLISH
Removing
QMB/QMJ/QMQB
1
Fusible
Switches
1. Turn off the main power.
2. Turn switch handle(s) to the OFF position.
3. Disconnect the load wires.
4. For QMB and QMJ switches, remove mounting screws holding the switch to the
mounting rail. For QMQB
1
switches, remove the bolts holding the switch to the
line terminal.
5. Unplug the switch.
Ground Fault Protection Systems
Check the terminal connections on the ground fault protection system at least once
a year for tightness and corrosion. If the system can be tested without tripping the
main or branch device, directions for testing the system are in the device manual.
Otherwise, testing the ground fault protection system will trip the main or branch
device to which it is connected. If the ground fault sensor or relay is physically or
electrically damaged, replace it.
If the ground fault protection system does not operate properly and additional
equipment has been connected to the installation since the last maintenance
test/check, de-energize the entire system, and check for grounds on the neutral
downstream from the main bonding jumper. If no downstream grounds are
detected and the ground fault system is not operating properly, contact
Schneider Electric Services at 1-888-778-2733 (US) or 1-800-565-6699 (Canada).
If no additions have been made to the installation and the ground fault protection
system does not operate properly, contact Schneider Electric Services at
1-888-778-2733 (US) or 1-800-565-6699 (Canada).
Refer to the ground fault field test instruction manual for additional testing information. If
the manual is not available, refer to “Section 11—Reference Publications” on page 54
of this manual to obtain the appropriate number. Contact your local Schneider Electric
representative to obtain this manual.
1
QMQB switches are available in Canada only.