DSH 576 Abnormal operation

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广东安规检测
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DSH 576 % U7 C* Z8 w' a% x9 q- S' x" j

Abnormal operation 6 d+ h; j9 L+ d5 _# V; ?7 z3 A

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60335-2-60(ed.3) $ L# A2 {: j, j- j1 a/ [1 P# y

9 i9 u2 X; b, n! W$ w& h( Z5 @/ n' BQuestion:
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":
- should the signal lines be insulated considering the voltage referenced to ground, in which case the requirement for insulation will not be stringent?
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0 w9 H' T* ?+ u. f- should the voltage between the lines be considered instead, in which case the insulation requirements will be more stringent?
9 z* J- {2 n3 z( U8 K0 O( `' zDecision:
6 w, k3 L: ~! t& hIf 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.

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