"Mike" wrote in message
...
On Mon, 26 Jan 2009 10:38:32 GMT, "ARWadsworth"
wrote:


"Mike" wrote in message
. ..
On Sun, 25 Jan 2009 10:46:49 +0000, David Hansen
wrote:

On 24 Jan 2009 15:01:24 GMT someone who may be "Bob Eager"
wrote this:-

The difficult bit was getting cable with the right rating and number of
cores. In the end I went to the local plumbers merchant, and even they
struggled. In the end they found me a 'reel end' and I got it for a
pound!

http://www.tlc-direct.co.uk/Products/CA0dot75F7.html has six cores
plus protective conductor. That should be fine for most household
systems. Unused cores can be terminated and left spare.

While six cores plus cpc is suitable for Y plans - I've used it
myself, unfortunately you need seven plus cpc for S plans. I'm not
aware of any supplier of this.



I wire up S plans quite often and I have never needed 6 cores plus CPC.

Do not leave me guessing, why did you need more than 6 cores?

From the standard Honeywell diagram

Really ****ty copy here
http://content.honeywell.com/uk/homes/Schemes/s1.jpg

Terminal 1 Grey wire to both zone valves (common contact)
Terminal 2 Blue wire to both zone valve motors
Terminal 3 Green Yellow cpc to both zone valves
Terminal 5 Brown to heating zone valve motor
Terminal 6 Unspecified colour to cyl stat normally open
Terminal 8 Brown to cyl stat common and hot water zone valve motor
Terminal 10 Orange wire to both zone valves (Normally open contact)

I can't see any further scope for core sharing and so make that 6
cores plus cpc. (not the seven plus cpc I said)

Maybe it was 5 plus cpc for Y plan and 6 plus cpc for S plan and it
was the 6 plus cpc I couldn't find This would be around 8 or 9 years
ago I went round all the local electrical factors plus Newey and Eyre
and CEF.

I would have preferred to go S Plan because I had previously acquired
a large box of unused 2 port 22mm valves at an auction and the desire
to use a single cable rather than a hotch potch of T&E on a brand new
build mean that none of them got used and I had to go out and buy half
a dozen 3 port valves (it was a multiple holiday let installation)


--

You are correct Mike. It would be 7 core doing it your way on the S plan. My
apologies.

Adam