Understanding Insulation Resistance Testing
insulation looks ok. Time-resistance tests on large rotating electrical machin-ery – especially with high operating voltage – require high insulation resistance ranges and a very constant test voltage. A heavy-duty megohmmeter serves this need. Similarly, such an instrument is better adapted for cables, bushings,
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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.
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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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