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Understanding Insulation Resistance Testing - AEMC
insulation of the windings of the machine being tested. A test voltage is applied for a fixed period of time, usually 60 seconds and a reading is taken. The spot reading test should only be carried out when the winding temperature is above the dew point 1. The operator should make a note of
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Three-Phase Dual-Voltage Motor Insulation Resistance …
www.aemc.comLow Voltage 1,7 2,8 3,9 4&5&6 High Voltage 1 2 3 4&7, 5&8, 6&9 In this case, high-voltage connections are the same as for delta motors. The wiring diagram for a wye connected 9-lead motor is as follows: Wye connected 9-lead wiring diagram Note that the wye-connected 9-lead motor’s internal connections vary from the delta motor.
Fall-of-Potential Testing with the Ground Resistance ...
www.aemc.comResistance Tester Model 3640, the simplest and easiest to use member of our Ground Resistance Tester product family. This direct reading instrument measures ground resistances from 10 milliohms up to approximately 2000 ohms at the push of a button – no
Understanding Soil Resistivity Testing - AEMC
www.aemc.comTechnical Assistance (800) 343-1391 www.aemc.com 5 The value at this point is the depth needed to drive a 5/8 inch diameter rod to achieve 10 ohms of grounding electrode resistance given the soil resistivity measured. Looking at the completed nomograph, we see that a single rod would need to be driven 30 feet deep to meet our 10 ohm objective ...
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