Pre-energizing Checkout Procedure
Conduct a complete inspection before the switchboard is energized to ensure that all components function and operate properly. Complete every step of the checkout procedure before energizing the switchboard.
Check all field-installed bus bar connections. Torque values are listed in Torque Values for Electrical Connections. | |
Check all accessible connections for tightness. | |
Check all factory- and field-installed lug terminations for tightness. | |
Check the rigidity of all bus bar supports. | |
Check the switchboard enclosure for dents or other damage that reduces electrical clearances inside the switchboard. | |
Remove all foam blocks, or other temporary cushioning or retaining material, from the electrical devices. | |
Manually open and close all switches, circuit breakers, and other operating mechanisms, checking for correct alignment and free operation. | |
Operate all electrically operated switches, circuit breakers, and other devices equipped with remote operators (not under load). An auxiliary source of control power may be necessary to accomplish this. | |
Check all relays, meters, and instrumentation to verify that all field- installed wiring connections are made properly and that the devices function properly. | |
Current transformers (CTs) supplied for customer use require connection to a metering device load before energizing. Verify that the metering device load is properly connected, including main switchboard connections to remote equipment. | |
All CT circuits supplied by Schneider Electric for customer metering use are shorted for shipment. Remove shorting terminal screws on shorting terminal blocks or jumpers and store in the block. | |
Factory-installed circuit breakers may have an adjustable magnetic or electronic trip which is factory set to the lowest setting. To provide coordinated operation during an external electrical fault, adjust the trip as outlined in the instruction manual provided with the circuit breaker. All poles are adjusted simultaneously, using a screwdriver, by the single setting. | |
If ground fault protection is furnished on type BP switch, adjust the relay to the desired ground current pickup setting. The relay is shipped from the factory at the lowest setting of 120 A for the relay. Relay pickup range is from 120–1,200 A for the relay. | |
For molded case circuit breakers, refer to Reference Publications for circuit breaker information. | |
Check the torque on all bolts of the fuses mounted in Bolt-Loc™ switches, 250–360 lb-in. (28–41 N•m), and in QMB/QMJ switches (as marked on the device). |
NOTICE |
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HAZARD OF FUSE CLIP OVERHEATING
Do not pry open or spread the fuse mounting clips. Doing
so can cause a loose connection.
Failure to follow these instructions can result in equipment
damage.
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Examine fuse clip contact pressure and contact means (QMB/QMJ fusible switches). If there is any sign of looseness, contact Schneider Electric Services at 1-888-778-2733 (US). Loose fuse clips can result in overheating. | |
Check all QMB/QMJ 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 SquareD™ brand fusible switches. |
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 (see Main Bonding Jumper Installation). |
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HAZARD OF OVERVOLTAGE TO CONTROL AND PROTECTION COMPONENTS
Failure to follow these instructions can result in personal
injury or equipment damage.
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Conduct an electrical insulation resistance (Megger®) test to minimize risk that the switchboard is free from short circuits and undesirable grounds. | ||
Check all QMB/QMJ 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 SquareD brand fusible switches. | ||
Open all control power and metering disconnects or remove the fuses from the control circuits. | ||
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. | ||
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. | ||
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. | ||
Consult Schneider Electric Services at 1-888-778-2733 (US) to help correct any problems. | ||
After completing the electrical insulation resistance test, replace all control power fuses that were removed and close power disconnects that were opened. | ||
Check all field-installed wiring. Make certain it is clear of all live parts, and when instructed, secured to withstand external electrical fault currents. | ||
Verify that all control wiring between sections is connected. | ||
Vacuum to remove any dust, scrap wire, or other debris. |
NOTICE |
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CONTAMINATION HAZARD
Do not use an air hose to blow out the switchboard. Dust
can settle inside relays and overcurrent devices, causing overheating
and improper operation.
Failure to follow these instructions can result in equipment
damage.
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Ground Fault Protection Systems
Paragraph 230-95(c) of the National Electrical Code requires that all equipment ground fault protection systems be tested when first installed. If the circuit breaker has equipment ground fault protection installed, test it at this time.
- Make sure the trip unit is powered. The trip unit is powered
if any of the following conditions exist:
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The circuit breaker is closed or bottom fed and has more than 100 V of load voltage on two phases (P or H trip unit only).
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The full-function or hand-held test kit is connected and on.
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An external voltage tap is installed, and voltage of more than 100 V is present on two phases (P or H trip unit only).
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- If the system is a radial (single-ended) system, press the ground fault Push-to-Test button. The circuit breaker trips, and the trip unit ground fault indicator light comes on.
- Record results on the ground fault system test log.NOTE: If a complete check of the ground fault protection system is necessary, use primary injection testing. If the system is multiple source and/or requires field connections at the job site, use primary injection testing.
Some ground fault protection systems require field connections at the job site. Consult the switchboard interconnection wiring drawing for details.
Maintenance Mode Switch (MMS) Testing
MMS system testing must be completed per MFR70008. When the MMS switch is turned ON, the associated circuit breaker will be set to the “trip with no intentional delay mode” (in the Maintenance Mode Setting).
- For an I-Line mounted, backfed main application on FlexSet Switchboards, when the MMS is turned ON and the main circuit breaker is OPEN, the blue light will not illuminate, and the main circuit breaker will be set to “trip with no intentional delay mode” (in the Maintenance Mode Setting).
- For an I-Line mounted, branch circuit breaker application on FlexSet Switchboards, when the MMS is turned ON and the main circuit breaker is CLOSED, the blue light will illuminate, and the branch circuit breaker will be set to “trip with no intentional delay mode” (in the Maintenance Mode Setting).
- For an I-Line mounted, branch circuit breaker application on FlexSet Switchboards, when the MMS is turned ON and the main circuit breaker is OPEN, the blue light will not illuminate, and the branch circuit breaker will be set to “trip with no intentional delay mode” (in the Maintenance Mode Setting).