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connect boiler and nest heatlink from the same switched fused spur

FollowerOfTheRules

My boiler is currently powered by a switched fused spur. The spur is located 40cm underneath the boiler.
I haven't checked but it is probably a 3A fuse.
My boiler is

a Ideal Logic combi ESP1 35 : idealheating.com/.../logic-combi-esp1-installation-and-servicing.pdf

I would like to add a Nest thermostat using the opentherm wiring as described here page 24: https://nest.com/support/images/misc-nest-thermostat-eu/gen3-install/3rd-gen-Nest-Learning-Thermostat-Install-Guide-UK.pdf

The wiring is relatively easy, I just need 230V AC  N + L to power the device and then 2 low voltage wires to the Opentherm on the boiler.

My question is, where do I get the the 230V AC  N + L from ? the easiest way and following the regulation.

Can I get it from the current switched fused spur that powers the boiler ?
if yes, shall I connect the nest heatlink N+L directly from the switched fused spur (load side)   

or 

shall I connect the nest heatlink N+L  directly from the boiler on the MAIN input?

Thanks in advance.

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    In general there is no harm in using a mains rated cable on a lower voltage. It's the other way about we worry about !! 

    Colours wise, the only one folk get really hot under the collar about is using green/yellow for something that is not an earth, It is however good practice to label the cables - and that could be as simple as writing on it in sharpie, or on a little flag of white tape, just so that anyone coming in after you can work out what is going on and does not have any expensive mistakes.

    Mike.

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  • 0

    In general there is no harm in using a mains rated cable on a lower voltage. It's the other way about we worry about !! 

    Colours wise, the only one folk get really hot under the collar about is using green/yellow for something that is not an earth, It is however good practice to label the cables - and that could be as simple as writing on it in sharpie, or on a little flag of white tape, just so that anyone coming in after you can work out what is going on and does not have any expensive mistakes.

    Mike.

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