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Appendix C — Recommended Test Voltages
Recommended DC Voltages for Insulation Resistance Test
EASA AR100 and IEEE 43 sections 5.4 and 12.2 provide guidelines on voltage to be applied during Insulation
Resistance (IR) testing. Test voltage should be applied for one minute.
Table 20: Recommended DC Voltages for Insulation Resistance test: EASA AR100 and IEEE 43.
Winding Rated Voltage (V)*
<1000
1000–2500
2501–5000
5001–12,000
>12,000
* Rated line-to-line voltage for three-phase AC machines, line-to-ground for single-phase machines, and rated direct
voltage for DC machines or filed windings.
Recommended DC HiPot and Surge Test Voltages
Megger Baker Instruments has a recommended standard (see table) for test voltages for DC tests and Surge tests
conducted on a motor, generator, or transformer. That standard is twice the AC line voltage plus 1,000 volts.
This test voltage is consistent with NEMA MG-1, IEEE 95-1977 (for test voltage greater than 5,000 volts) and IEEE 43-
2000 (test voltages less than 5,000 volts).
View other standards in the tables below for a comparison of IEEE 95, EASA AR100 DC-HiPot, IEEE 522 Surge testing,
IEC 34-15, and Megger Baker Instruments recommended testing voltages.
NOTE: The tables list representations of motors, as well as the formulas to calculate voltages so that you can
calculate test voltage of any size motor.
Table 21: IEEE 95 for HiPot test.
V Line
Per Unit
480
392
575
469
600
490
2,300
1,878
4,160
3,397
6,900
5,634
13,800
11,268
www.megger.com
Insulation Resistance Test Direct Voltage (V)
Min Test,
V Line × 1.25 × 1.7
1,020
1,222
1,275
4,888
8,840
14,663
29,325
500
500–1000
1000–2500
2500–5000
5000–10,000
Max Test,
V Line × 1.5 × 1.7
1,224
1,466
1,530
5,865
10,608
17,595
35,190
145
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