Fused spur from an immersion switch?

[jimk996]

Go on Murdoch maybe you've seen what others haven't, give us a Regs No.to cross ref?

 

[decolad69]

For ****s sake dedicated circuits don't count for anything anymore are you thick

WOW ! This is't the usual banter ! You guys know the regs backwards! Can i suggest you put down the regs and try a dictionary? Dedicated means dedicated no matter if there is capacity in the circuit is dedicated to the immersion heater.

No offence intended

 

[trev]

How about in the late 70s/early 80s. It was common practice then to have a bathroom heater running from a dedicated lighting circuit. My sister and her husband had just such an arrangement in their new build house in Blyth.

 

[decolad69]

The seventies where full of dedication !

 

[THE INVERTER]

Im getting a bit fed up with this heater
How about a fused spur for a power shower (3A) off of the same circuit
sweet

 

[Swicade]

Cant think of any smegulation against upgradeing to 20A mcb (cable distance permiting) and slinging 2 heating appliances on the one (what used to be) dedicated supply.

While we're at it may aswell start wiring Night store heater supplies the same way....may save abit of cable/ time/ money .....rumour has it 'Dedicated circuit' has reserved the plot next door to 'Common sense'.

TBH wouldn't do it meself.... people who still wire immersion heaters off a RFC annoy me.... but each to thier own, as long as it's quick/easy/good earner then alls good.

 

[Deleted member 9648]

Wirepuller ... this wouldn't comply regarding the 2way switch method as it would fall foul of 554.3.3 unless you were to have a double pole switch also which you failed to make clear in your suggestion.

Agree..assumed it would be obvious...but should have made that clear.
I have used this method before,once when a regular client had done a bathroom and had UFH fitted by the tiler who had left the tail next to the IH FCU just assuming we would feed off that. There was no way of getting another supply to to the point without disruption to his new bathroom, so I fiitted the 20a 2way switch to the IH supply radial and then to a 20a DP switch for the IH and an FCU for the floor heating..both applinces DP switched,the 2w was labelled as a changover sw only..the 16a mcb remained the same and before anyone asks,yes it was RCD protected. As far as I'm concerned this remained a dedicated circuit as only one appliance could be in operation at once.

For what it's worth I also think the IH should remain a dedicated radial,partly because it's recommended in 7671...and partly because it's traditional and therefore expected,and partly because it makes sense.
I think the 20a upgrade and supplying the heater from the IH would be a very last resort if there was no other way.
But the regs are not statutory...and if there was no other practical way of feeding the heater there is no reason why it couldnt be done cable ratings etc permitting...as depending on installation methods there may be as much as twice the capacity on a 2.5mm as the 3kw load,and the OP stated 5a FCU which must be a max of 1kw....or possibly much less. That was all I was attempting to get across to KAS1...who never once provided any valid reasoning for his stand beyond a rant,which is inclined to cause digging in and trench warfare rather han a sensible discussion.

 

[KAS1]

I'm only trying to get some of the so called sparks on hear to to a "good job" if the customer can't afford it then walk away, don't let some people, talk you into short cuts, you know it makes sense to do the right thing ie good workmanship after all that's one of the things this industry used to pride itself on. As for running another curcuit of an immerstion heater curcuit in my book that's a short cut and a bodge (maybe a temp) don't do it, we can all work the regs to suit ourselves at times but lets keep things to a standard. Next they'll be saying it's ok to run a cable from your IH out to a spur fused down for your shed lights or whatever.

 

[Rockingit]

I'm not going to get embroiled in some silly biggest willy contest in the boys toilets, and as such I've not read the entire thread.

Circuits, however they are (safely) devised, are there to feed equipment. What we call those circuits afterwards is almost irrelevant. So if someone has got spare 'capacity' on an existing circuit to feed more equipment (safely), then that's fine by me as far as principles are concerned. Practicalities might suggest doing something else, of course.

 

[Octopus]

I'm not taking sides here but lets say its added to the immersion circuit - then an inspection is done - my bet is on that its a C2 and fail for a shared circuit!!

 

[KAS1]

Sounds about right to me lol

I'm not taking sides here but lets say its added to the immersion circuit - then an inspection is done - my bet is on that its a C2 and fail for a shared circuit!!

 

[HandySparks]

I'm not taking sides here but lets say its added to the immersion circuit - then an inspection is done - my bet is on that its a C2 and fail for a shared circuit!!

I'm not saying it's a desirable situation, but providing the current carrying capacity of the cable is sufficient under all conditions of use, I wouldn't regard it as potentially dangerous and would therefore give it a C3.

 

[Octopus]

I'm not saying it's a desirable situation, but providing the current carrying capacity of the cable is sufficient under all conditions of use, I wouldn't regard it as potentially dangerous and would therefore give it a C3.

Which means you would perfer it not to be like that or simply doesn't comply??

 

[Deleted member 9648]

In order to code it at all it would have to contravene a regulation.....if you fella's want to point me in the direction of the appropriate regulation I'll stand corrected.

 

[Geoffsd]

It's quite difficult to take this seriously but can a 2.5mm 20A radial circuit not supply items totalling 20A?
(Could even be 25A I suppose)

One solution would be to go to the CU and under where it says 'Immersion' write 'and heater'.