Instructional Booklet
Page
14
Effective: July 2008
O & M Manual for the EGS AutomaticTransfer Switch
with RTC-50 Control and Integral Loadcenter - 100 Amp
For more information visit: www.eaton.com
IB70-8671
7.2 Procedures
A suggested maintenance procedure to be followed is outlined in Table 3.
Table 3. Recommended Periodic Maintenance Procedures.
STEP
ACTION
a. Make the transfer switch equipment safe for inspection and/or maintenance.
Disconnect the line power from the equipment being serviced by opening next highest disconnect
device. Make certain that any accessory control power is switched off.
b. Inspect the structure area for safety hazards or potential maintenance problems.
Inspect the area, especially where the contactor is installed, for any safety hazards, including per-
sonal safety and fire hazards. Exposure to certain chemical vapors can cause deterioration of the
electrical connections.
Inspect for accumulated dirt, loose hardware, or physical damage.
Examine the primary insulation for evidence of cracking or overheating. Overheating will show as
discoloration, melting, or blistering of the conductor insulation, or as pitting or melting of the con-
ductor surfaces due to arcing.
Inspect the secondary control connections for damage, and control wiring for insulation integrity.
c. Inspect the contactor for dust, dirt, soot, grease, moisture, or corrosion.
Remove dust, dirt, soot, grease, moisture, and corrosion contamination from the surface of the
switching device using a dry, soft lint-free cloth, dry soft bristle brush, and vacuum cleaner. Do
not blow debris into the contactor. If contamination is found, look for the source and fix the prob-
lem.
d. Check for material integrity, uneven wear, discoloration, or loose hardware.
Severe material cracking will require replacement and loose hardware will need to be tightened.
e. Check the terminals and connectors for looseness or signs of overheating.
Overheating will show as discoloration, melting, or blistering of the conductor insulation.
Connections that do not have signs of looseness or overheating should not be disturbed.
f. Exercise the contactor if it is not often exercised while in operation. This will permit the wiping
action by the contacts.
If a switching device is used for frequent switching during normal operation, this step can be disre-
garded.
g. Return the transfer switch equipment to service.
Make certain all barriers are in place and the door is closed. Re-apply generator and utility power.
