Wireless thermostat Wiring live and neutral from boiler terminal

[Azz]

I am a gsr and just wanted clarification as to why its not recommended to just use a 5 core cable connecting live, neutral, com and nc from combi boiler terminal box rather then feeding another cable from spur socket just for live and neutral for reciver box. Any advise

 

[chris watkins]

Where have you seen / heard the recommendation?

 

[Azz]

Manufactures instructions states to feed L and N direct from spur. Just seems intresting to know

 

[chris watkins]

Isolation requirement from Switched Fused Connection Unit. (power in). I am guessing that if your "com and nc" refers to the volt free or low voltage switching pair that combi's tend to use it would not be a good idea to have them along side 230V power in. For one thing cables running close to one & other can induce a current to flow on each other.

 

[Welder]

Isolation requirement from Switched Fused Connection Unit. (power in). I am guessing that if your "com and nc" refers to the volt free or low voltage switching pair that combi's tend to use it would not be a good idea to have them along side 230V power in. For one thing cables running close to one & other can induce a current to flow on each other.

Chris is correct. If however you need to switch 230VAC & not volt free or bus based then a 5 core is fine.

 

[Murdoch]

Manufactures instructions states to feed L and N direct from spur. Just seems intresting to know

I find that hard to believe ...... best keep all boiler and controls systems on the same supply imho

 

[Azz]

Many thanks Chris, appreciate the anwser