DSH 576 Abnormal operation

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DSH 576 1 _# t' q8 h: O2 m8 v

Abnormal operation + Q7 \8 y: B+ T

19.11 ; f. S: `7 {2 M% k+ E! L

60335-2-60(ed.3)

; z* y# a' _0 P5 G5 `6 y/ f/ h; dQuestion:
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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- should the voltage between the lines be considered instead, in which case the insulation requirements will be more stringent?
Decision:
$ ?( w. D% d' B  @/ wIf 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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