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UL778中的Dielectric voltage-ithstand:
! r }5 A; F6 r; t k35.1.1 A pump shall with stand for 1 minute without breakdown the application of a 60-hertz, essentially sinusoidal potential:% n4 c( }" x5 ]% y2 r, r
a)Between live parts and grounded dead metal and
4 q9 p9 |- ]6 \b)Between the terminals of a capacitor used for radio interference elimination or arc suppression.The test potential shall be as follows:
+ M9 L, c0 |0 W! P1 U2 Z1)One thousand volts for a nonsubmersible pump rated no more than 250 volts, and no more than 1/2 horsepower(373 watt output).
9 K# U% d% v; }9 L2)One thousand volts plus twice the rated voltage for a nonsubmersible pump rated more than 250 volts, or more than 1/2 horsepower.4 p; }9 k; ~2 H* f9 n
3)One thousand volts plus twice the rated voltage for a submersible pump.
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4 o7 U0 M, Q2 a) B; P35.1.2 The required test potential may be obtained from any convenient source of sufficient capacity at least 500 volt-amperes capable of maintaining the potential at the required test value except during breakdown.The voltage of the source is to be continuously variable.
2 w! r. N6 s9 }: z- _! e9 CException: A 500 volt-ampere or larger capacity transformer need not be used if the transformer is provided with a voltmeter to directly measure the applied output potential.
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35.1.3 In the case of a DC pump, the test potential is to be direct current. U4 E* y* W5 p! H, M
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看的不是很明白,那位高手幫忙指點指點。 |
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