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Question:
, d' _' |& k/ l1 N& ySome 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":( |. S6 T% V' K' w/ u
- 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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8 T5 m, Q- _; u& j/ _" |1 j$ o- should the voltage between the lines be considered instead, in which case the insulation requirements will be more stringent?% A9 m% s8 t6 I% I; K7 t# G6 y* C
Decision:
1 n& z. d/ ^! v9 X0 GIf 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.2 Z# q, l3 M6 N8 T
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发表于 2012-9-8 20:35
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