Hi John:
> But what it is really NOT to be used for is anything that has wiring
> installed in the walls and/or ceiling voids. This wiring is very
> vulnerable to accidental contact with mains wiring when the building is
> being altered, painted etc.
In the USA, we violate this principle. As far
as I know, this wiring has not proved vulnerable
to accidental contact with mains wiring.
In the USA, power for doorbells is floating SELV
and is installed in the walls and ceiling voids.
Same for telephone conductors. There are no
requirements for the insulation of these wires
as voltage is SELV and the power is considered
less than that necessary for fire.
Such wiring cannot be in contact with the mains
wiring in those walls and ceilings. Furthermore,
the mains wiring must be protected against
insulation or conductor damage due to alterations,
etc., by installing various protective devices
and by routing limitations.
Best regards,
Rich
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