5044 B U Bowman Dr #102  :::  Buford, Georgia  30518

e-mail stedipower@tvss.net   :::  Phone: 678.546.6780

 

Comprehensive Electrical System Maintenance Checklists


GENERAL ANNUAL CHECKS
(1) Review past maintenance records to find repair patterns. These records may point to certain components that should be closely inspected during performance of preventive maintenance.
(2) Review operator records concerning electrical load readings; compare with equipment ratings. Operator records regarding operating temperatures and any documented abnormal circumstances associated with the system should also be reviewed.
(3) Inspect Secondary Electrical Distribution Equipment:

(a) Inspect to ensure that warning signs exist. Replace as required. 
(b) Inspect enclosures for damage, unauthorized openings, and corrosion of metallic objects. Repair and paint as required. 
(c) Inspect air passages and remove any blockage. 
(d) Inspect, investigate, and solve conditions for unusual odors.
(e) As equipment is operated and tested, listen, investigate, and solve conditions for unusual noises.
(f) Inspect electrical connections for degradation and tightness. Repair as required. 
(g) Inspect electrical insulation for discoloration and degradation. Repair as required. 
(h) Inspect equipment grounding components such as conductors and connections. Repair as required. 
(i) Inspect insulators for damage. Replace as required. 
(j) Inspect liquid immersed equipment for leaks and damage. 
(k) Inspect indicating lights for correct illumination.

(4) Remove debris, dirt, and other foreign objects from all components, housings, cabinets, panels, etc. 
(5) Torque all electrical connections to design value.. 
(6) Verify operation of space heaters and control thermostat. Check thermostat set point for proper setting. 
(7) Verify the grounding of the equipment and associated neutral where applicable.
(8) Conduct infrared test on all main current carrying equipment for hot spots that may indicate overload conditions or loose connections. 
(9) Using calibrated test instruments, calibrate ammeters, voltmeters, etc.  Verify continuity of metering selector switch contacts with ohmmeter. 


COMPREHENSIVE ELECTRICAL SYSTEM CHECKLIST

Secondary Distribution System

Annual
Inspect to ensure that warning signs exist. Replace as required.
Inspect enclosures for damage, unauthorized openings, and corrosion of metallic objects.
Inspect air passages and remove any blockage.
Inspect, investigate, and solve conditions for unusual odors.
As equipment is operated and tested, listen, investigate, and solve conditions for unusual noises.
Inspect electrical connections for degradation and tightness.
Inspect electrical insulation for discoloration and degradation.
Inspect equipment grounding components such as conductors and connections. 
Inspect insulators for damage.
Inspect liquid immersed equipment for leaks and damage.
Inspect indicating lights for correct illumination.
Clean equipment. 
Tighten electrical connections..
Verify space heater operation
Verify equipment grounding.
Perform infrared test.
Calibrate recording and indicating metering.

Low Voltage Switchgear, Switchboards, and Panelboards
Six Month:
Inspect solid electrical insulation for discoloration and degradation.
 
Annual:
Review operator records.
Inspect barriers and shutters for physical damage.
Test phase bus insulation
Service circuit breakers.
Inspect drawout contacts for abnormal wear, tension, and discoloration. Correct as required.
Inspect breakers’ current carrying components for discoloration that may indicate overheating. Replace as required.
Inspect, operate, adjust, and lubricate mechanical linkages. Replace components as required.
Verify interlocks preventing a closed switchgear drawout breaker from being withdrawn from or connected to the switchgear bus.
Inspect and dress current carrying contacts on air circuit breakers in accordance with manufacturer’s recommendations.
Test power circuit breakers. Perform test operations to prove correct actuation of breakers’ trip and close components, including spring charging motors, trip solenoids, indicating targets, etc.
Perform contact resistance test.
Perform insulation resistance test on each phase-to-phase and phase-to-ground using a megohmmeter.
Prove circuit breaker operation by actuation of each associated protective device.
Prove circuit breaker operation by actuation of each breaker’s manual control switch or handle.
Test molded-case circuit breakers. Perform overcurrent test on critical load breakers to prove correct actuation of breaker’s trip and close components.
Perform contact resistance test on critical load breakers.
Prove circuit breaker operation by actuation of each breaker manual control switch or handle.
Verify equipment alarms.
Protective device calibration .
Perform harmonics analysis 
Measure and record neutral currents.

Transformers
Annual:
Inspect forced cooling system equipment for damage, etc
Operate system by simulating high temperature at controlling devices.
Verify transformer alarms.

Motor Control Center
Annual:
Inspect main contacts and auxiliary contacts on contactors.
Inspect pushbuttons, indicating lights, selector switches, etc. 
Inspect indicating lamps for burned out bulbs or improper illumination. 
Test phase bus insulation
Inspect drawout contacts for abnormal wear, tension, and discoloration. Correct as required.
Inspect units’ current carrying components for discoloration that may indicate overheating. 
Inspect, operate, adjust, and lubricate mechanical linkages.
Verify mechanical interlocks. yr Inspect and dress current carrying contacts on switches and contactors in accordance with manufacturer’s recommendations. 

Motor Starter
Annual:
Manually operate switches and circuit breakers to verify correct operation.
Operate starter unit using all manual and automatic control devices to ensure correct operation.
Verify correct interlocking action with other associated equipment.
Verify correct indicating light operation.
Verify equipment alarms

Automatic Transfer Switches
Annual:
Inspect, operate, adjust, and lubricate mechanical linkages.
Verify operation of mechanical interlocks.
Inspect and dress current carrying contacts in accordance with manufacturer’s recommendations.
Test automatic transfer switches Perform insulation resistance test on each phase-to-phase and phase-to-ground using a megohmmeter.
Perform contact resistance test.
Prove correct operation of the transfer switches by manually initiating transfers in both directions.
Simulate the automatic conditions requiring automatic transfer switches to transfer in both directions
Verify starting generators where applicable.
Verify correct indicating light operation.
Verify equipment alarms

Safety Switches
Annual:
Inspect, operate, adjust, and lubricate mechanical linkages. Replace components as required. 
Verify operation of mechanical interlocks.
Inspect and dress current carrying contacts in accordance with manufacturer’s recommendations. 
Test safety switches Perform insulation resistance test on each phase-to-phase and phase-to-ground using a megohmmeter of each critical load switch.
Perform contact resistance test on each critical load switch.

Secondary Distribution Feeders
Annual:
Perform cable inspection
Every 3 years:
Perform cable insulation test
Every 5 years:
Perform busway insulation test

 



PHONE:   (678) 546-6780      FAX:   (678) 546-6782

Technical Support
tech@tvss.net 

Stedi-Power, Inc.
5044 B U Bowman Drive,
Suite 102
Buford GA 30518

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Stedi-Power, Inc
5044 B U Bowman Drive #102
Buford, Georgia 30518
PHONE: (678) 546-6780

Last Updated: 07 Jun 2004
©1997-2004 Stedi-Power, Inc.
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