"Chris French and Helen Johnson"
wrote in message ...
In message , Franz Heymann
writes

"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

What's the problem here Franz? Soil warming cables, thermostats etc.
all
standard kit intended for greenhouses - as is my mains electric
heater,

I would not go near mains heating cables buried in damp earth. Full
stop.
Low voltage units are available for this obvious reason.

Franz