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DC and Surge Tests Voltages
Recommended 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 DC-HiPot, IEEE 522
Surge testing, IEC 34-15, and Megger 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 6. Megger Baker Instruments recommended voltages.
V Line Per Unit In Service, 2E + 1,000
480 392 1,960
575 469 2,150
600 490 2,200
2,300 1,878 5,600
4,160 3,397 9,320
6,900 5,634 14,800
13,800 11,268 28,600
NOTE: Use the “Peak Voltage” value shown on the screen to obtain the proper test voltages.
Table 7. IEEE 95 for HiPot test.
V Line Per Unit Min Test,
V Line × 1.25 × 1.7
Max Test,
V Line × 1.5 × 1.7
480 392 1,020 1,224
575 469 1,222 1,466
600 490 1,275 1,530
2,300 1,878 4,888 5,865
4,160 3,397 8,840 10,608
6,900 5,634 14,663 17,595
13,800 11,268 29,325 35,190
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