2 Gang 2 Way Switches - Help!

[newbe]

Hi, I had a question about '2 gang 2 way switches' on the assumption that a downstairs lighting circuit supplies all the
downstairs lights and one on the upstairs landing ( as each light operates from 2 locations).

Imagining the rooms ceiling rose terminals have been fed the supply makes its way to the ceiling rose in the downstairs hallway. Now I know that the feed from this rose will go down to the 2 gang 2 way switch downstairs and be connected to one of the gangs.

I know that this gang is connected to the same gang on the switch upstairs using 3 core and earth, so that they can both operate the same function. I also know that the left over gang on each switch is wired up with 3 core as well so that it too will operate the same function. This is where I get lost.

Should their still be a connection from the downstairs ceiling rose to the upstairs ceiling rose?
Should the 2 gang 2 way switch upstairs be connected to the upstairs ceiling rose?

Any help would be appreciated. P.s. I'm not trying this at home, I'm just trying to get my head round it!

Thanks

Rob

[terrence]

are you talking about a light on top of the stairs and one at the bottom ?

[newbe]

Yes - a 2 way 2 gang at the bottom and top of stairs .

[sxsparky]

2g should switch 2 different lights
2w switches the same light in 2 locations

Each switch should have a live and a switch line

If two plate you will have one t+e at the light

Three plate has loop in, sometimes loop out if not a end of line

Now if you 2way switch the live to light should in l1 permant live in l2 at one of the point/switches
Your three cores should be linked and matching in both.switches with a core.in common.

[sxsparky]

Each two way requires a permenant live, switch line to light and a three core. One point will have all of above other.will have a.3 core on its own from the other.switch

[davey-s01]

simple!!