Question about 2 way switch wiring

[jfb]

Lighting for downstairs is being done with circuit wire being brought into the switches not using ceiling roses.

 

Essentially I'm using 1.5mm twin and earth for the main supply and 1mm to any bulbs. It runs radially from switch to switch.

 

For the landing light I have a switch downstairs (S1) and a switch at the top of the stairs (S2) which need to be arranged in a 2 way fashion.

 

Do i need both a 1.5mm twin and earth for the supply from S1 to S2 AND a 3 core and earth from S1 to S2?

Or can it be done with just a 3 core and earth from S1 to S2?

 

Thanks

 

 

[ProDave]

There are at least 4 ways of wiring 2 way switching, use whichever you prefer.  But I would always loop a feed through a switch, even if not actually used.

 

I never use 1.5mm no point it's too large for some fittings if you have to get more than one wire in.

[Temp]

9 hours ago, jfb said:

Or can it be done with just a 3 core and earth from S1 to S2?

 

Yes you can do that..

 

Twin and Earth from CU (or previous on radial) to S1.

3 Core and Earth (Two switched lives a Neutral and Earth) from S1 to S2.

Twin and Earth from S2 to the light.

 

Twin and Earth from S1 to another light elsewhere. You can't go from S2 to another light with this set up as it only has switched lives. But if S2 is upstairs that wouldn't be a great idea anyway. Better to have one lighting circuit for each floor.

Edited June 22, 2022 by Temp

[jfb]

thanks all.

 

Just had electrician who will be signing off round and he explained things nicely.

 

Its all going to be easier than I thought!