DSH 576 Abnormal operation

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DSH 576 1 y: O, l1 {4 A4 y2 t% H+ ?

Abnormal operation $ M. y+ _' S  e4 v0 g/ _6 T

19.11 % x2 K$ d, o6 L' e8 t

60335-2-60(ed.3) + |/ U0 K- y1 E2 H. X* k6 V( g& u2 x

Question:
' a- I% h. N- p: {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":
5 H8 Z+ M! I1 p7 j0 j- should the signal lines be insulated considering the voltage referenced to ground, in which case the requirement for insulation will not be stringent?
or
& Q% F5 f( Q# L8 G; E- should the voltage between the lines be considered instead, in which case the insulation requirements will be more stringent?
Decision:
7 X" S9 N9 F% x8 Q5 }+ w: k4 ?) b" |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.