"Chris French and Helen Johnson"
wrote in message ...
In message , Chris R. Lee
writes
Hope you used a special transformer. A dimmer gives pulses of mains
voltage
that are a lethal as the straight mains.

And why is this a problem?

AFAIK heating cables are mains voltage anyway - I have one in home
made
propagator controlled by a rod thermostat control no transformer
AFAIK

Blimey

Franz