Stairs switches

[TNDU]

I have old light switches at the top and bottom of my stairs and I want to change them to new ones. I have found this is the wiring set up for them at the moment.

Downstairs switch is labelled like this

Top row connectors

A (COM) - red
B (1 WAY) - yellow
B (2 WAY) - blue

Bottom row connectors

A (1 WAY) - yellow
A (2 WAY) - blue
B (COM) - red


Upstairs switch is labelled like this

Top row connectors

A (COM) - red
B (1 WAY) - blue
B (2 WAY) - yellow

Bottom row connectors

A (1 WAY) - yellow
A (2 WAY) - blue
B (COM) - red

Does this sound right???? Why is the yellow and blue not connected in the same way upstairs and downstairs? (puzzled)

 

[SFK]

The switch is a bit of metal wire permanently connected at COM. That metal wire then moves between the other two connection points, connecting COM to A1 or A2 in your example.

Hence it does not matter which of the pair of wires is in A1 or A2 as both of these connectors look the same to those two wires.

If you did switch the wires around (between A1 and A2) then the only difference you will see is that the switch itself will now seem upside down to the position it was in before.

See here for a diagram. The second diagram with three parallel wires is the most relevant to you. Consider the middle line as your red wire. And the outside lines as your yellow and blue wires.

Electrics:Two way lighting

www.diynot.com

Sfk

 

[EFLImpudence]

Also - do not treat it as top row and bottom row.

The switches are each a triangle - one A and one B.