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UL778中的Dielectric voltage-ithstand:9 D3 D) k d+ s; L: \6 Y
35.1.1 A pump shall with stand for 1 minute without breakdown the application of a 60-hertz, essentially sinusoidal potential:: f Q; M3 V( {2 l @
a)Between live parts and grounded dead metal and
# r# B" k, a% q2 }# m7 s3 ub)Between the terminals of a capacitor used for radio interference elimination or arc suppression.The test potential shall be as follows:' P7 t- L7 [! ]
1)One thousand volts for a nonsubmersible pump rated no more than 250 volts, and no more than 1/2 horsepower(373 watt output).' r- x5 ^. ?- V$ l W5 G6 F5 n o
2)One thousand volts plus twice the rated voltage for a nonsubmersible pump rated more than 250 volts, or more than 1/2 horsepower.
4 p2 y' x1 `% |: L/ r3)One thousand volts plus twice the rated voltage for a submersible pump. |1 x: r! n; _8 e2 D/ U2 z
1 k* z( `8 V4 y& ?35.1.2 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.9 ~! t9 f% b) g3 _; q( V3 d
Exception: 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.6 J1 Z+ Y3 `5 d3 B) a" D
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35.1.3 In the case of a DC pump, the test potential is to be direct current.' W0 u" U: T! [+ n. B
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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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