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 an Ideal Logic combi ESP1 35 : https://idealheating.com/uploads/documents/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/mis...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.

 

[Deleted member 120897]

Probably best taking the L and N directly from the boiler, but you can come from the load side of the spur, I wouldn’t take it from the feed side, as there would be no way of isolating it from a single source.

Since you’re a rule follower, the cover on that particular boiler forms part of the combustion circuit and needs to be checked afterwards.

 

[FollowerOfTheRules]

Probably best taking the L and N directly from the boiler, but you can come from the load side of the spur, I wouldn’t take it from the feed side, as there would be no way of isolating it from a single source.

Since you’re a rule follower, the cover on that particular boiler forms part of the combustion circuit and needs to be checked afterwards.

thanks for your reply.