DSH 576 Abnormal operation

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DSH 576 " V* H# D# a( \4 b/ ^. P0 Z

Abnormal operation , E0 x3 V6 J  Z, c1 m* g

19.11 - ^- e4 w$ S' T& \8 n  `* I# @

60335-2-60(ed.3) " g! A" A8 a  ]  ~5 a4 m

+ N, Z" b4 B! h, E! p" _3 vQuestion:
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":
& _# R/ q% Y- W$ Z" O- G- 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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2 O- N- K9 f$ f4 V- i+ }- should the voltage between the lines be considered instead, in which case the insulation requirements will be more stringent?
Decision:
, `+ b1 t8 X4 D' \4 Q# q6 j7 m/ ^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.
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