Wiring open therm stat

[Matt0029]

The live neutral and earth coming to the boiler would be in the same cable as the stat wires. So I couldnt use this 2 wires to take a feed to the open therm connections? Putting wagos on the 2 stat wires and running heat resistant 2 core to the open therm?

 

[Matt0029]

If not acceptable with the current wiring set up I'll look at just putting a hard wired stat on. Boiler plus compliant

 

[Deleted member 120897]

Can’t run high and low voltage together in the same cable

Is this to do with ghost voltages, inductance or something? Is it a BS?

 

[ShaunCorbs]

Is this to do with ghost voltages, inductance or something? Is it a BS?

Correct your spot on

 

[Matt0029]

Can you explain more please. Thanks

 

[Deleted member 120897]

Can you explain more please. Thanks

I’m thinking the thermostat might start misbehaving.

 

[IND_Nick]

I’m thinking the thermostat might start misbehaving.

Yeah I believe the 240V could cause an induced voltage in the Low Volt open therm, causing mixed signals etc. The sparkies I work with won't run anything low voltage, Cat 6/ alarm etc in same runs as socket/lighting cable as it can cause the same problems apparently.

 

[ShaunCorbs]

Yep you will get it famtonly turning on / mind of its own

 

[Timmy D]

Need a minimum of 10mm spacing between low voltage and extra low voltage.

If you can find another source close by for your low voltage power, you could use existing wires for the extra low voltage back to boiler.

 

[Brian D]

Recently wired two open therm stats using 5 core. Not had any communication issues at all.