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| 60335-2-60(ed.3); a' ]# }' H: ~& v( m' f
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Question:
3 X2 b3 i& ?* O7 T6 e, xSome 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":! G) w; s9 c# |# Q( ]9 G1 v+ x( R, K
- 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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+ G# J0 B/ x! b, Z9 x6 t$ E- should the voltage between the lines be considered instead, in which case the insulation requirements will be more stringent?0 [7 x$ K$ U( T; [6 V- @
Decision:
( Y% M7 _& @( J P6 CIf 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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发表于 2012-9-8 20:35
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