Which terminal is switched live?
- Thread starter theflyingpig
- Start date
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There isn't a switched live on the thermostat (yet!).
The terminals are 'dry contacts', meaning that the relay contacts open, or close on demand, but aren't connected to a power source within the thermostat.
This is useful for systems that have (extra) low voltage controls i.e. at 24V DC, that would be destroyed by mains voltages.
If you do have a 230V system, your 'switched live' would be connected to terminal 4, and a link would need to be added between 'L' and terminal 1 (as it says in the instructions!
).
The terminals are 'dry contacts', meaning that the relay contacts open, or close on demand, but aren't connected to a power source within the thermostat.
This is useful for systems that have (extra) low voltage controls i.e. at 24V DC, that would be destroyed by mains voltages.
If you do have a 230V system, your 'switched live' would be connected to terminal 4, and a link would need to be added between 'L' and terminal 1 (as it says in the instructions!
).Ah ah! thank you for explaining that!
So how many cores does cable from wiring centre to wired programmable room thermostat need? It is a 230v & systemThere isn't a switched live on the thermostat (yet!).
The terminals are 'dry contacts', meaning that the relay contacts open, or close on demand, but aren't connected to a power source within the thermostat.
This is useful for systems that have (extra) low voltage controls i.e. at 24V DC, that would be destroyed by mains voltages.
If you do have a 230V system, your 'switched live' would be connected to terminal 4, and a link would need to be added between 'L' and terminal 1 (as it says in the instructions!
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It depends on your system and the thermostat...
If you had a separate programmer and only wanted a thermostat in a fixed location, e.g. a battery powered Nest thermostat E would require 3 cores - an earth, a live and a switched live.
Whereas a wired stat that also incorporated a programmer, on a 'Y Plan' system, may require a 6 core cable.
The thermostat you link to above, would need a 4 core cable: L, N, switched live and earth.
How about telling us what you want to achieve, or this may become the longest game of 20 questions!
Hah, yes.
It's an S Plan plus with a Grant oil boiler. 3 x 2 port valves controlled by a EPH 3 zone programmer, with (eventually) 3 EPH wired programmable room stats.
It's an S Plan plus with a Grant oil boiler. 3 x 2 port valves controlled by a EPH 3 zone programmer, with (eventually) 3 EPH wired programmable room stats.
Ok, then as above - a 4 core cable to each thermostat would be needed.
Even if the thermostat doesn't require an earth connection, the wiring regs suggest otherwise.
Alternatively, EPH offer a wireless thermostat kit - no extra wiring required!
Thanks... Yes, I considered wireless but the house has some very impenetrable walls, and I've got the access now I device on wired.
So it's as simple as L, N, E and then switched live to terminal 4, with terminal 1 and 4 connected....
So it's as simple as L, N, E and then switched live to terminal 4, with terminal 1 and 4 connected....
Just checking, though I'm sure you already have, you boiler does use a 240V SL, not all do, some use 0V, some can use either.
The internal Grant heat only just requires a switched live, the external needs a permanent live as well for build in frost stat and servicing switch.
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