As part of the fire protection system, Nova offers service, testing and inspection for auto  transfer switches.

General Inspection

External Inspection- The transfer switch should be kept in good condition by performing a weekly overall or any level of this inspection should include checking for signs of vibration damage, excessive heat, any leakage, contamination or any level of deterioration. Any accumulations of dirt or dust have to be removed. Dirt, dust and any other contaminants should always be removed from the outside and inside with a vacuum cleaner, dry cloth or brush. Never use compressed air to blow away dirt and other contaminants. this can result in debris being lodged in components resulting in damage to the switch.

If inspection reveals loose or damaged components call a trained professional to carry out repairs. any broken. warn or missing external components should be replaced with manufacturer’s recommended parts or components. Contact the local authorized distributor or dealer for the specific part number to order.

Internal Inspection

All power sources should be disconnected before any internal inspection is made. On opening the switch door, check to see if any external problems detected have affected internal components.

A trained service technician should be contacted to carry out any service work if any of the following conditions are detected:

  • Dirt, dust, moisture and other contaminants accumulating on the surfaces of the unit and components
  • Any signs of corrosion
  • Loose, missing or broken components
  • Deterioration of wiring or insulation due to cuts, abrasion or wear
  • Indications of overheating due such as melted plastic, discolored metal or burning odor
  • Any other evidence of damage, wear or malfunction of the transfer switch and its components

Inspections beyond visual inspections:

When inspections are internal or more than just a visual inspection by the operator, they should be performed by an authorized distributor or dealer under a scheduled preventative maintenance agreement. Have an authorized distributor or dealer repair or replace all damaged or worn internal components with the manufacturer’s recommended parts or components.

Disabling the generator set – Accidental starting can lead to severe injury and even death:

Precautions must be taken to avoid the generator set starting during maintenance by an automatic transfer switch, remote start/stop switch or another remote start engine command. Before working on the generator set or any of its connected equipment, such as the transfer switch, disable the generator set as follows:

  • Move the generator master switch to the OFF position
  • Disconnect the power to the battery charger
  • Remove battery cables starting with the negative (-) lead first


Standby generator systems should be exercised once a week, using the automatic exerciser (if provided) or a manual test to start. The transfer switch automatic control system should be tested monthly. The test should verify the following:

  • The required sequence of operation occurs when the load transfers to the emergency source following primary source failure
  • Verify indicator LEDs on the transfer switch operates properly
  • Observe and listen for any excessive vibration or noise during operation
  • After the switch transfers the load to the standby source, end the test and verify the expected sequence of operations occurs as the transfer switch transfers the load to the primary power source and signals the generator set to shut down after a cool down period.
  • For systems with programmed time transitions, verify that the time delay in the OFF position functions during transfer to the standby source and transfer back to the preferred

Nova Electrical Contractors LLC

16307 Alderwood Lane, Bowie, MD 20716

(301) 747-8338