“A Stitch in Time...”
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test Voltage vs. Equipment Rat<strong>in</strong>g<br />
Commonly used DC test voltages for rout<strong>in</strong>e ma<strong>in</strong>tenance are as follows:<br />
Equipment AC Rat<strong>in</strong>g DC Test Voltage<br />
up to 100 volts<br />
100 and 250 volts<br />
440 to 550 volts 500 and 1,000 volts<br />
2,400 volts 1,000 to 2,500 volts<br />
or higher<br />
4,160 volts and above 1,000 to 5,000 volts,<br />
or higher<br />
Test voltages used for proof test<strong>in</strong>g of equipment are considerably higher<br />
than those used for rout<strong>in</strong>e ma<strong>in</strong>tenance. Although there are no published<br />
<strong>in</strong>dustry standards for DC maximum proof test voltages to be used with<br />
rotat<strong>in</strong>g equipment, the schedule given below is customarily used. For<br />
specific recommendations on your equipment, you should consult the<br />
manufacturer of the equipment.<br />
Proof Test Voltages for Rotat<strong>in</strong>g Equipment:<br />
Factory AC Test = 2 x Nameplate Rat<strong>in</strong>g + 1000 volts<br />
DC Proof Test on Installation = 0.8 x Factory AC Test x 1.6<br />
DC Proof Test After Service = 0.6 x Factory AC Test x 1.6<br />
Example:<br />
Motor with 2,400 VAC nameplate rat<strong>in</strong>g–<br />
Factory AC Test = 2(2,400) +1,000 = 5,800 VAC<br />
Max. DC Test on Installation = 0.8(5,800)1.6 = 7,424 VDC<br />
Max. DC Test After Service = 0.6(5,800)1.6 = 5,568 VDC<br />
16<br />
A STITCH IN TIME
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