Stop looking I Gluegled it . Now I'm really puzzled !! Its a single core 2491X flexible .
So why would the stuff the heating people dumped on me today specify that cable for wiring all the zone stats?
The Are battery powered Myson stats that need a pair of control wires back to the manifolds , heating guy said use bell wire but I found that hard to believe.
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Back later guys thanks for replies.
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OK Next question is , this is an Air Source heating system with zone stats in every area , 13 in all ,using Myson stats , heating guy says use bell wire , manufacturer's instructions say H05V-K . Anyone do these regularly?
Never having wired from battery powered stats before they'll have to tell me in writing I think , I don't trust a load of bell wire fixed in the fabric of this new build .