Some help swapping these 2 way switches (NOW SOLVED)

[morgiee]

Hi all, hope you can help. Just redecorated and changing the sockets and light switches. We have a town house so two floors.

By the front door and the bottom of the stairs is a two way switch that controls the bottom stairs light and the first landing lights

On the first floor is a single intermediate switch that turn on and off the landing lights and a single switch that turns on and off the top floor light

Top floor is a double switch that controls the top stairs light and the 2 first floor lights.

The issue I'm having is transferring the wires from the old switch into the new switch as the terminals are marked up differently.

Old switch: com X2 - black wires with black sleeve

L1-l2. Then another L1 L2

The new switch is com 1, com 2, l11, l12 ,l21, l22

I assumed l11 and l12 was old L1 and L2

And l21 and l22 was other old L1 L2

But this setup keeps tripping the RCD

What configuration do I need so that the new switch wires up and works like the old?

Many thanks for your help

Old Front door double switch∆∆

Old Top floor double switch

New switch setup to replace both

 

[bernardgreen]

On the old plate the two switches are the same way up On the new plate one switch is upside down.

 

[morgiee]

I understand that thanks, but there is no L1 and L2 terminals on the new switch. The terminals are, l11,l12 then l21 and l22

Thanks

 

[EFLImpudence]

Well, if you understand the two triangles then what difference does it make what markings are used?


They have made it easier for you by marking one switch 1 and the other 2 with the appropriate COM, 1 and 2.

COM1
L11
L12

COM2
L21
L22

 

[EFLImpudence]

When you say it trips THE RCD, are all the lights covered by one RCD or are the three lights on different circuits and two RCDs trip?

I think the only thing that would cause an RCD to trip is - if the lights are on different circuits - and you have mixed up some wires.

Either the COM wires in the picture which look the same - or

some of the wire couples but that would be more difficult.

 

[morgiee]

Well, if you understand the two triangles then what difference does it make what markings are used?


They have made it easier for you by marking one switch 1 and the other 2 with the appropriate COM, 1 and 2.

COM1
L11
L12

COM2
L21
L22

This resolved it thanks, the com 1 and com 2 explanation made sense. I labeled the wires up marker pen to identify which was from switch 1 and switch 2

Thanks again

 

[EFLImpudence]