Title Page

  • Site conducted

  • Conducted on

  • Prepared by

  • Location

  • Work Order Number

Untitled Page

(T)ools, (S)afety Equipment and (M)aterials

  • Electrician's Tool Set

  • Micro-ohmmeter

  • Variable AC voltage source (test cable)

  • Multimeter

  • Lamps

  • Cleaning equipment and materials

  • Lubricants

  • Infrared test set

  • Flashlight

Safety Guidelines

  • Schedule the work with the users

  • Lock out and tag circuits as necessary for safety

  • Review and follow the manufacturer's instructions

  • Report any problems you find

  • Record the results in the maintenance log

Maintenance Procedures

  • Make sure the unit is loaded to at least 40% of rated current and perform an infrared section on the inspection on the generator side of the automatic tra

  • Verify proper operation of the maintenance bypass

  • Open and tag the normal and generator supply breakers. Use the maintenance bypass if the power cannot be turned off

  • Open the doors on the automatic transfer switch and check phase-to-phase and phase-to-ground for presence of voltage

  • Clean the inside of switch cubicle, conductors and buss work

  • Check all conductors for signs of overheating, mechanical, or moisture damage to conductors

  • Tighten all connections to manufacturer's specifications

  • Inspect all exposed ground connections. Be sure the connections are clean and tight

  • Clean the bus insulators

  • Clean the conductors, terminal boards, enclosures, and panels with vacuum cleaner

  • Make sure the heaters (if installed) work correctly

  • Lubricate all movements and linkages

  • Disconnect the conductors to the under-voltage relays. Test the under-voltage relays using a source of test voltage. Record drop-out and pick-up voltages. After testing relays, re-connect the conductors

  • Find and disconnect the transfer operating mechanism control power. Use a remote source of voltage to operate the transfer mechanism

  • Check the contact resistance on the normal and emergency contacts with a micro-ohmmeter

  • Re-connect the operating mechanism control wires

  • Clean indicating lenses and change lamps as needed

  • Restore the transfer switch to normal position

  • Check with affected occupant agencies for generator operations

  • Remove tags and energize normal supply breaker

  • Re-accomplish the infrared inspection on any problem areas in the normal position

  • Remove tags and place generator controls in the automatic position

  • Open normal power breaker; the generator should start and the transfer switch should transfer the load to the generator source

  • Re-accomplish the infrared inspection on any problem areas in the generator position

  • Close the normal power breaker The transfer switch should transfer the load to the normal power source and the generator should shut down after the cool down period

  • Check with the affected occupant agencies to see that normal services have been restored to all areas

Maintenance Hours

  • How much time was spent on this work order?

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