gjlelec wrote:Don't ground the machine to the radiator, you are assuming the radiator itself is grounded via the pipework- it may not be. if the machine develops an earth fault you will have a "live" machine AND heating system !! Don't know about France but in the UK there is a particular electrical regulation in place that prevents you doing what you are considering. The only safe method of providing an earth is via the socket that powers the appliance itself. If you decide to ignore this and proceed anyway, can i have your watches
:D
It's almost impossible to have a "live" heating system - the gas pipes go thru the ground, the water(supply) pipes go thru the ground, the furnace probably sits on a concrete floor and is totally uninsulated from the ground! The common thinking with most large appliances, is to
Intentionally "ground" the entire case - or in the case of a heating system, all pipes, housings, ventpipes, etc. That way, if a HOT wire(+) gets loose and make contact with the housing,etc., it will immediatly blow a fuse or pop a circuit breaker. Your grounding lug in the UK does the same job as our ground lug in the US - provides a hard-wired link to "Ground". Only difference: here in the States our normal two-pronged plug is one ground and one hot, and the three pronged plugs are merely supplying a secondary "safety" ground. The primary ground is supplied via the electrical company, the secondary ground is generally clamped to a long rod driven into the ground or
clamped to a wire pipe on site.
Safety note: metal ceiling grids for hanging ceilings should always be grounded. Nothing like climbing a metal ladder and finding out the ceiling grid is "hot".
Been there, done that.
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