DSH 576 Abnormal operation

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DSH 576 * ^- i! ]% B! P- N 8 @7 o2 }3 Q' m, E+ [5 e% P

Abnormal operation 4 p( x8 k4 h8 n: U6 @% \, I6 Y

19.11 ! y. g" i; }3 Y# _- |

60335-2-60(ed.3) ! C% I/ L  D! ?  s! O1 p. _

& V5 c1 f) E7 F1 S0 \2 K! ^0 sQuestion:
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?
or
- should the voltage between the lines be considered instead, in which case the insulation requirements will be more stringent?
9 [/ T% ]3 `; t2 M: MDecision:
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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