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3.3.4
• Check with the equipment manufacturer for factory insulation
• Do not rely on insulation resistance testing alone as proof of wind-
• Do not expect the same value for all parts of all machines.
• Observe consistent test time duration, recognizing that total
• Correct all readings properly to a standard reference temperature
• Know what you are testing. Isolate the piece of equipment from
• Watch trends rather than relying on single "spot" readings.
3.3.5
Figure 3-1 shows the connections to measure the insulation of one con-
ductor to the other conductors. The cable should be disconnected at both
ends to avoid leakage through switchboards and panels.
14
0.561.8187
Tips For Successful Insulation Resistance Testing
resistance readings.
ing conditions.
current through insulation under test will vary with time.
(see IEEE Std. #43-1974, Temperature Correction Curve).
other circuitry.
Insulation Measurement - Connections
www.
Conductor Under Test
+
-
Figure 3-1
.com
Cable Insulation
Megohmmeter Model 6527
information@itm.
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