Section 7—Maintaining the Switchboard Power-Style™ QED-2 Switchboards
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ENGLISH
To test Masterpact NW circuit breakers with Micrologic trip units, use the
full-function test set, catalog number S33595, or the hand-held test set, catalog
number S33594, which are available from Schneider Electric.
To test Masterpact MTZ circuit breakers and control units, use EcoReach,
which is available from Schneider Electric.
NOTE: Tests can be conducted with a circuit breaker installed in the
switchboard; circuit breaker removal is not required. The switchboard
must be de-energized.
QMB/QMJ/QMQB
1
Fusible Switches
Refer to the QMB/QMJ/QMQB
1
instruction manual for complete maintenance
information. If the instruction manual is not available, refer to “Section 11—
Reference Publications” on page 54 of this manual for the appropriate number.
Contact your local Schneider Electric representative to obtain the manual.
Switch Maintenance 1. Periodically exercise the switch to ensure proper operation. This period should
not exceed one year.
2. Check the cover interlock with the switch in the ON position. The cover should
not open using normal hand force.
3. Inspect the switch interior for any damaged or cracked parts, and replace
as necessary.
4. For fusible switch units, check the fuse mounting clips or bolted contact area for
corrosion or discoloration (indicating overheating). Replace them if necessary.
5. For additional maintenance instructions, see the label on the inside of the door.
Fuse Replacement (Fusible
Switches Only)
1. Turn the switch to the OFF position before opening the door.
2. Observe the switch blades to confirm that the switch is in the OFF position.
3. Using a properly rated voltage sensing device, verify that line and load ends of
the fuse are not energized.
4. Observe all warning labels specifying the type of fuse to use. Do not substitute
a non-current limiting fuse, or attempt in any way to defeat the rejection feature
of the fuse clips furnished with the switch. Do not use renewable link fuses in
Schneider Electric fusible switches.
1
QMQB switches are available in Canada only.
DANGER
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH
Always check line and load ends of the fuses for voltage before starting the fuse
replacement procedure with a properly rated voltage sensing device.
Failure to follow these instructions will result in death or serious injury.
NOTIC
HAZARD OF FUSE CLIP OVERHEATING
Do not pry open or spread the fuse mounting clips. Doing so can cause a loose
connection, resulting in overheating and nuisance fuse blowing.
Failure to follow these instructions can result in equipment damage.
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