On 14/02/15 19:49, Mark Carver wrote:
On 14/02/2015 18:20, charles wrote:
In article , Mark Carver
wrote:
On 14/02/2015 17:38, charles wrote:
In article ,
wrote:
On Saturday, 14 February 2015 16:38:04 UTC, Kevin wrote:
I see that many suppliers now offer both SP and DP versions of
switched sockets, with DP up to 50% dearer for a given make. What
governs which version one should use?

You can't use a switched one of any variety for supplying a boiler.

I don't, having made my own decision 26 years ago. Is it now in the
regs?

What's the logic behind that directive ?

my logic was that removing power to the system, which includes the pump,
could result in overheating of the boiler and a consequent shut down, so
that when power was restored the boiler wouldn't restart. This could,
if I
wasn't at home, result in expensive call out charges.

Does you boiler carry on heating with the power removed ? It's no worse
(or better) than suffering a power cut surely ?

Well - it is undesirable but power cuts are rare. I would always turn
the boiler off at it's own control first, wait for the pump to go quiet
then cut external power.

I can understand the need to isolate fully for maintaince etc. Mine is
fed by a DP FCU.