TP-6461 1/08
17
Section 1 Scheduled Maintenance
Hazardous voltage.
Can cause severe injury or death.
Only authorized personnel should
open the enclosure.
(600 volts and under)
WARNING
Testing live electrical circuits.
Hazardous voltage or
current can cause severe injury or death.
Have trained and
qualified personnel take diagnostic measurements of live
circuits. Use adequately rated test equipment with electrically
insulated probes and follow the instructions of the test
equipment manufacturer when performing voltage tests.
Observe the following precautions when performing voltage
tests: (1) Remove all jewelry. (2) Stand on a dry, approved
electrically insulated mat. (3) Do not touch the enclosure or
components inside the enclosure. (4) Be prepared for the
system to operate automatically.
(600 volts and under)
Millivolt Drop Test Procedure
1. Apply a balanced load of at least 10% of the switch
rating. (Currents of 10 amps or greater will give
more accurate results than lower currents.)
2. Carefully measure the voltage on each phase of
both sources from the source lug to the load lug.
Take several readings to ensure accuracy. The
readings may be erratic because of the small
voltage measured, load fluctuations, and meter
circuit contact resistances.
Note:
To obtain accurate readings, keep the meter
as far as possible from current-carrying
conductors and the meter leads as short,
direct, and at right angles to current-carrying
conductors as possible. This minimizes the
effect of induced voltages (transformer
effect) in the vicinity of the current-carrying
conductors.
3. Use an ammeter to measure the current flow
through the circuit.
4. Calculate
the
contact
resistance
using
the
following formula:
R = V
÷
I
Where:
V = measured voltage in
millivolts
I = measured current in amps
R = calculated resistance in milliohms
Compare the calculated values for resistance (R) to the
values in the table in Figure 1-3.
If the calculated
resistance is significantly higher (2 times larger or more)
than the value shown in the table, disconnect power,
check the connections and lug torques, and repeat the
test. If the second measurement also indicates that the
resistance is too high, replace the contact. See the ATS
parts catalog for replacement part ordering information.
Refer to the table of contents in the front of this manual to
locate the contact replacement procedure for your
switch.
Transfer Switch
Rating, Amps
Maximum Contact Resistance,
Milliohms (m
Ω
)
30--200
0.250
225--400
0.200
600--800
0.175
1000--1200
0.085
1600--3000
0.050
Figure 1-3
Maximum Contact Resistance
Every Three Years
Test the wire insulation. Use the following procedure to
check for insulation breakdown and replace any faulty
components.
Hazardous voltage.
Can cause severe injury or death.
Only authorized personnel should
open the enclosure.
(600 volts and under)
WARNING
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