Central Heating control cable from Screwfix

I don't think Screwfix do it...

TLC do 4, 5 and 7 core

Screwfix don't sell imperial adaptors but plumbers merchants do. Some say 22mm and 3/4" are interchangeable, providing you use a lot of solder. However I tried this method and failed! (The joint leaked everywhere).

You can however wedge 1/2" pipe into 15mm fittings - even I managed this okay.

Anyway 22mm > 3/4" adaptors are available online at

Luke

Thanks. I tried a bit of googling and found that Toolstation stock a 6 way cable in the correct core colours cleaper than TLC's 5 way (Stock code

I notice the also have 2 Port Motorised Valves for £28.70 - considerably cheaper than the Honeywell's from Screwfix at £43.99 - however they don't specify a brand. Are these likely to be cheap for a reason and best avoided?

Alan.

Noticed my B&Q sold heat resistant 5 core cable recently at a rip off, but available on the shelf now price.

"Alan" wrote

Watch out for Part P. Applicable to power or control wiring for new CH system.

Phil

Ah, but it's not a "new" CH system, just the old one modernised a bit ;-)

Alan.

Yes, officially it comes under the dreaded Part P. But violations are unlikely to be detected unless you succeed in burning your house down.

I had trouble getting what I wanted in less than a full reel. In the end I got it from the local plumber's merchant!

But if he burns the house down there won't be any evidence, will there?

Owain

They're Tower brand which is generally crap. I quite like the Sunvic ones from B&Q - not too expensive and easily removable (pull-off) heads so you can easily reverse them and quickly check the working of the wet and dry parts.

IIRC Toolstation also do 22mm x 3.4" but only in packs of 25 or so.

I'm not sure I'd use multi-core flex for all that unless the components are close. For things like the programmer and thermostat which are usually some way off, Triple and Earth can be a better bet as you'll probably need a drum of that for other uses. Multi-core is only really needed for extending things like 3 way valve wiring, or to the actual boiler.

On Thu, 29 Mar 2007 11:06:22 GMT, "Alan" mused:

The valves will come with flex attached.

The programmer would be better wired in fixed wiring cable, like twin and earth and 3 core and earth.

See programmer.

See thermostats. Add a flex outlet and pattress to near the boiler for transition from fixed wiring to flexible.

If any flexes aren't long enough then a flex outlet by it and an extension in twin and eareth\3 core and earth is fine. Excessively long runs of flexible cables are deemed to be a bodge.

Interesting, I'd assumed using twin & earth or 3 core + earth would have been considered the bodge! The valves will be within a meter of the main junction box, but boiler, stats and programmer won't be. I do have a reel of 3 core + earth in the garage however, so I could just use that then.

Thanks,

Alan.

"Alan" wrote

True, but I used the "new system" argument to get a certificate for my install when it was done recently just in case.

Phil

On Fri, 30 Mar 2007 00:11:45 +0100, "Alan" mused:

As long as final connections are in flex then no bodge.

Why not.

Depends on how thorough a job he makes of it!