TS 840 TRANSFER SWITCH
PM057 REV 8 10/01/25
18
Thomson Technology
7.
GENERAL NOTES ON SERVICING TRANSFER SWITCH MECHANISM
DANGER!!!!
Arc Flash and Shock Hazard. Will cause severe injury or death.
Do not open equipment until ALL power sources are disconnected
This equipment must be installed and serviced only by qualified electrical
personnel utilizing safe work practices and appropriate Personal Protective
Equipment (PPE). Failure to do so may cause personal injury or death
When performing any service work on the transfer mechanism, it is imperative that the following be
observed:
7.1.
To maintain mechanical integrity, ensure that:
•
Mechanical interlocking is correct when one power switching opens well before
the other should close.
•
All fasteners are adequately tightened.
•
The operating linkages are not damaged or bent, and that all bearing points
operate freely.
•
Check nylock nuts on bolt pivot points. Operation arms should move freely
without excessive play.
7.2.
To maintain electrical integrity, ensure that:
•
All electrical connections, especially power connections, are clean and
adequately tightened. Corroded or loose power connections will cause
destructive heating, and may cause premature tripping.
•
All insulating devices are in place and in good condition.
•
No moisture or other contamination is present.
•
Electrical conductors are adequately secured away from moving parts.
7.3.
To maintain operational integrity, ensure that:
•
All control devices are in good condition and correctly calibrated.
•
All control devices are adequately secured in their plug-in fixtures.
Only qualified personnel should undertake Service work. Failure to correctly maintain an
automatic transfer switch may present a hazard to life and equipment. Full operational
