DSH 576 Abnormal operation

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广东安规检测
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IEC60335试验指甲

DSH 576 5 H5 w9 H( f: w4 z ) m+ A# Z) M" H, a. P1 l

Abnormal operation

19.11

60335-2-60(ed.3)

0 P/ D" ]7 `5 q& M! L3 ^Question:
1 D* l6 {9 [# {) Y( KSome 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?
Decision:
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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