Rules and Guidelines
Want to participate in the discussions? Please read our Community Rules and Guidelines. Need some help? Visit Support and Answers.

  • State Not Answered
  • Locked Locked
  • Replies 6 replies
  • Subscribers 34 subscribers
  • Views 2330 views
  • Users 0 members are here
Options
You may also be interested in
This discussion is locked.
You cannot post a reply to this discussion. If you have a question start a new discussion

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

    1.5mm2 x 2 (no earth needed apparently if I don’t the t1/t2 on the nest.)

    Depends a bit on your chosen wiring system - typically 1.0mm² solid core or 0.75mm² flex - 1.5mm² solid core is a bit stiff to terminate into many PCB type terminals. It's usual to include an earth (c.p.c.) to all points and accessories even if it's not needed initially - to allow for a future replacement requiring an earth (actually a regs requirement in most situations).

       - Andy.

  • 0 in reply to AJJewsbury

    Thank you Andy, 0.75mm2 2+earth flex for the power, what about the cable for the low voltage  opentherm connection? Any regulations on that ? Can i use the same  0.75mm2 2+earth flex and not using the earth obviously ? Does the wire colour matter from a regulation perspective ?

Reply
  • 0 in reply to AJJewsbury

    Thank you Andy, 0.75mm2 2+earth flex for the power, what about the cable for the low voltage  opentherm connection? Any regulations on that ? Can i use the same  0.75mm2 2+earth flex and not using the earth obviously ? Does the wire colour matter from a regulation perspective ?

Children
No Data

Join us to get the best from IET EngX.

Joining EngX lets you personalise your experience so you stay up to date on the topics that interest you, plus you’ll be able to make connections who are looking to collaborate, exchange ideas and more.

Join us Not now

Community Rules & Guidelines