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9 {) ~1 S- a7 I4 |* T( w5 ZQuestion:5 m' @) ?- ?7 y! U/ _
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":) b- ^1 C! H8 ~2 D+ }) J9 u
- should the signal lines be insulated considering the voltage referenced to ground, in which case the requirement for insulation will not be stringent?& Q4 `5 l* `2 i( @5 M' B7 K. u7 h
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- should the voltage between the lines be considered instead, in which case the insulation requirements will be more stringent?
, |# W4 J( ^3 e8 vDecision:
D& F# ]! y" F+ H2 B1 q( B! g& pIf 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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