On Sun, 20 Dec 2015 20:59:05 -0000, Tim Watts wrote:

On 20/12/15 19:31, Mr Macaw wrote:
On Fri, 18 Dec 2015 19:10:46 -0000, Tim Watts wrote:

(Spun off from Chris' thread).

Just noticed my water heater isolator (about 45A load) gets rather warm
after 15-30 mins of operation.

Tightened the terminals - but it seems to be the switch element - the
toggle base gets to perhaps 40-50C by feel. Never noticed before because
I'd never really gone around feeling shower/water isolators under high
sustained loads!

Personally I'd expect a simple switch to be stone cold even under
permanent full load.

Is this reasonable - or time to replace? It's a GET plate - only 6 years
old.

My parents' one gets hot. It's a 15A switch running a 3kW immersion
heater. the front plate (plastic) gets to about 40C. When I looked
inside there was nothing loose or otherwise untoward, so I bought a
brand new decent (MK?) one. It got equally warm, so we decided to just
ignore it.


I've concluded MK are no longer decent - they are on my blacklist now.

I did take the old one apart - nothing obviously wrong so I am assuming
it is either a poor contact pad or a weak spring.

All these regulations and nothing to test things to stay at a decent temperature.

--
A man walks into a bar with a slab of asphalt under his arm and says, "A beer please, and one for the road."