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|  DSH 576
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8 r2 ?8 d: {8 i, i( I: Z" `! ~ | Abnormal operation0 O) s0 `6 d: y$ G* @& V& G( P8 R
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| 60335-2-60(ed.3)9 Z) X$ M2 x; V ^7 z2 _, d
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3 u' g+ A" B: S5 A# W3 {Question:$ K7 O3 @1 \: B
Some whirlpool baths incorporate a telephone set. Therefore they incorporate a connection to the telephone network, in which it is used voltages exceeding 50 V between the signal lines. Any way, the voltage measured from any line to earth is less than 12 volts. Taking into account that sub-clause 22.35 requires that "parts such as switches and controls accessible to the user in the bath shall only be supplied at safety extra low voltage not exceeding 12 V":
( e% }6 `, O9 r1 k8 J+ f- should the signal lines be insulated considering the voltage referenced to ground, in which case the requirement for insulation will not be stringent?* Q' ^' p7 K, J
or
7 l- G# `1 d% D7 x- should the voltage between the lines be considered instead, in which case the insulation requirements will be more stringent?( Q# `8 l$ k {3 [4 v& Y+ [* y5 @
Decision:2 u# c9 B; [! a* y: E$ K
If the knobs are directly connected to the telephone circuit, in such a way that the telephone line voltage supply the knobs, this construction is not accepted." @& m' ?6 m$ b6 m6 ?
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发表于 2012-9-8 20:35
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