DSH 576 Abnormal operation

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DSH 576 * g8 g" X( S- ^, w8 c

Abnormal operation ! U) H! v, Q: u  V

19.11

60335-2-60(ed.3)

  U9 E4 T# \+ b, VQuestion:
6 z$ n! w1 o% N# |4 HSome 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":
$ S: K- g1 Z( J* i. M7 [5 g8 s4 T- 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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$ F% V5 e1 j& V- Z; S( s- should the voltage between the lines be considered instead, in which case the insulation requirements will be more stringent?
2 ^$ L* V" i; p  S8 o- sDecision:
; _; o% G4 o5 U3 O  `- N! yIf 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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