The slowest re-wire in the history of the universe continues...
The next circuit in the firing line is the heating controls (bog
standard Y-plan). My previous heating systems all got their power from a
socket ring via an FCU with a 3A fuse, except the current one, which has
a 13A plug-top! I'll be putting in a dedicated 3A MCB for the new
circuit and I was wondering if I could dispense with the FCU.
The MCBs I'm using do say they're suitable for use as isolators, though
they're only single pole of course. The boiler can have its own FCU if
the instructions specifically ask for a 3A fuse.
So, would it be a big no-no to leave out the FCU? I'd put one in, but
I'm having trouble thinking of a sensible place for it to go...
On Sun, 08 Jul 2012 15:47:52 +0100, Dave Plowman (News) wrote:
Well some of us have slightly more complex systems...
That is incomplete the top row is two RF room stats and two channel time
switch. Next row down two wiring centers the slot is for the solar
controller. Then four DP isolators for boiler/pump, stove controller,
heating system and solar system. Immersion switch and unswitched socket
with 3A fused plug to feed the lot (except immersion...). The stove
controller is now bottom left corner.
Like wise, mine is like that so it's easy to connect to an extension lead
and generator. Yes it has been used that way, in anger for 36 hours, and
the system has only been in about eight months.
Mine seems to have been done like that so you can unplug the system to
allow the kettle and toaster to both be used at the same time. You can
then have a cold shower the following morning...
I suppose it it's unswitched you have to unplug it (isolating it fully)
to work on it, if it's switched (likely only single pole) you could be
tempted to just turn it off, and leave the neutral connected, and would
be at the mercy of someone colour blind, or ignorant wiring it ...
Hmmm, the boiler is right out on a limb, wiring-wise and it's not the
only bit that might need servicing. If I have to put in an isolator, I'd
much rather it went in the airing cupboard, some distance away but next
to the pump, 3-way valve and wiring centre. It seems to make more sense,
especially as the boiler will have its own isolator anyway. Or is it
that heating engineers are trained to look next to the boiler for
something to isolate the whole system?
It'd be nice if I could fit a boiler-only and an overall isolator. IMHO
it would be a safer system. There'd be an isolator close by whether you
were woking in the airing cupboard, or on the boiler in the kitchen.
Less temptation to work live.
That'd be a pain. I'd have thought clear labeling would have sorted out
any confusion. Still, if I can't have a boiler isolator then fair
enough. I'll just have to get a more hard-wearing stair carpet :o)
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