Wiring of a Honeywell wireless cmt921 thermostat

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23 Jul 2007
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Mid Glamorgan
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United Kingdom
I have just bought this honeywell RF stat and looking through the installation manual I cannot understand the wiring arrangement for the receiver, I am going to use 2x 2 core heat flex cable (1 for the voltage free switch and the other for L&N).

Anyone installed these willing to share the diameter cable used for each connection, the manual seems to point towards 1.5mm - 2.5mm core for the L&N with outside diameter of less than 7mm, whilst the voltage free switch of greater than 7mm.

I am connecting to a 3amp protected combi boiler, any idea on cable size?

Rgds
 
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