DSH 576 Abnormal operation
http://decisions.iecee.org/icons/ecblank.gif DSH 576
Abnormal operation
19.11
60335-2-60(ed.3)
Question:
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?
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.
页:
[1]
