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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.

Parents
  • 0

    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 ?

    It's usual to power boiler controls from the boiler supply circuit - and the nest's instructions seem to suggest doing just that - so yes that seems to be the way to go. Regulation wise you can connect it where ever is convenient (FCU or boiler or some wiring centre in between) - but also check the boiler instructions - some prefer controls to be wired after the boiler's own on/off switch (so that that switch isolates everything).

       - Andy.

Reply
  • 0

    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 ?

    It's usual to power boiler controls from the boiler supply circuit - and the nest's instructions seem to suggest doing just that - so yes that seems to be the way to go. Regulation wise you can connect it where ever is convenient (FCU or boiler or some wiring centre in between) - but also check the boiler instructions - some prefer controls to be wired after the boiler's own on/off switch (so that that switch isolates everything).

       - Andy.

Children
  • 0 in reply to AJJewsbury

    Thank you, regarding the wire section what do you suggest? 1.5mm2 x 2 (no earth needed apparently if I don’t the t1/t2 on the nest.)

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