Permanent live to a boiler

[mrloy99]

Assume that the main supply is upstairs in the airing cupboard together with the clock,vave(s) etc. There is just a t/e running down to the boiler. Clever heating firm come along and fit an Icos boiler that needs a perm live or a back boiler that has lights in the front or electronic ign for the gas fire.
Normally i insist that a new 3 core/earth is installed, but tomorrow,s job apparently that ain,t gonna happen!
They reckon i should fit a 3 pole switch with the switced live and neutral then spur off a local socket for the perm live taking that through the 3rd terminal of the 3 pole. Phew! The 3 pole would then give means of isolation at the boiler but there would still be 2 different supplies at the boiler.

Ian

Hi Ian,
I recon your easiest way out would be to ensure that you have volt free contacts at the timeclock/programmer,then take out the link,then arrange it so that your t&e going to boiler would
be your switchwires(COMING from and going back to boiler)instead of your neutral which would now be coming from your new local boiler supply.You could then fit a caution label at programmer (fed from 2 sources)But maybe too late and you've the job done

 

[andyb]

That would work mrloy99 if the valves and pump were by the boiler, if not you have the same problem.
A feed from the boiler after going through the time clock would need to open a valve and start the pump, both of these need a neutral.

 

[mrloy99]

That would work mrloy99 if the valves and pump were by the boiler, if not you have the same problem.
A feed from the boiler after going through the time clock would need to open a valve and start the pump, both of these need a neutral.

I suppose you would need to see the full set up,but maybe at the board the two circuits could be put
into one breaker to keep it all on one circuit,then at least the whole lot could be isolated there in one go.

 

[Guest123]

Hey Ian.

If you've already done the job then ignore this.

I came across this exact situation only about 3 weeks ago.

I had a phone call from one of the kitchen staff in the school where I had been working to say the all the little red neons on her switched fused spurs in her kitchen wouldn't go off.

When I got there the first thing I noticed in the corner of the kitchen was a shiny new worcester boiler which a large Anglo Fossil Fuel company had that very day installed.

Sure enough no matter what way the switches on the spurs were, the neons stayed on, never done that before she said

Anyway I'm going off on one here so to cut a long story short BG had spurred off the kitchen ring to feed this new boiler as there was only the T+E coming down from the wiring center in the airing cupboard. Now all was fine as long as the boiler spur was turned on but when she turned this off thus removing perm live supply to boiler all the neons in the spurs lit up.

Reason - switched live still present from timer upstairs running through boiler and out via prem live supply backfeeding (only a small amount of voltage) onto kitchen ring.

Moral of the story install new 3c+cpc.