two way switch wiring help

You've got the terminology right, the 'traveller' is the red wire. This circuit is very common
for wiring two switches, one to enter a room at one end, and exit the room on the other
side of it.
Google it, and you should easily find the circuit. Any household wiring book will show
it also. You don't have to buy the book, just find one in a home improvement store,
and look it up.

 

Everybody uses plastic 'gang' boxes anymore cause they're cheaper. If you're in the States, Electrical code would require (probably) 14-2 wire (14 gauge-2 conductor), but also (maybe 14-3 for your traveller)
inside that romex insulator jacket, will be the (uninsulated) ground wire. It doesn't matter that the box is plastic, ALL those uninsulated grounding wires have to be connected
to one another (and it's actually 'grounded' to a pipe outside the house).
So if I'm understanding you, the answer is 'yes'.
All the ground wires connect to the on-off switch grounding screw (usually green), and also to the
uninsulated grounding wires in the box. Safety requirement.
Did I make sense?

 

Ground should have nothing to do with current-carrying duty on mains wiring, that's reserved for the Live & Neutral conductors.
Metal boxes needs to be grounded - for them to be safe. Plastic boxes can't be grounded of course - but has to be able to pass on the ground wiring to other items/outlets.
Click on "Go Advanced" below to get access to an Attachments icon. Make sure the picture is not much bigger than 100kB and 1024 x 768 pixels.

 

In the UK, the bare wire in the cable is used for the earth (ground). It must be sleeved inside any box with yellow/green sleeving. An earth must be taken to any light fitting in case they have a metal case so that a fluorescent fitting or crystal chandelier is earthed.
All earth wires go back to the fuse box and all pipes, water and gas and kitchen sink must also be earthed so that there is a common earth potential inside the house.
Work such as this in the UK would need to be done by a qualified electrician.

 

The picture shows up all-right (though it would only needed to have been 400 x 700 pixels), but the symbols are completely unfamiliar to me. Makes no sense to me.

 

On an otherwise insulated switch in a plastic box there would be a terminal (on the switch) designated for grounding, but it would not be connected inside the switch.
In other words, in a plastic housing it would just be a blind terminal meant to enable the continuance of the ground wiring to other points along the wiring route.
It's only neccessary to connect ground to accessible conductive objects.

 

What is so difficult to understand?
Run a short wire from the switch green ground screw to the wire nut that has all the other
ground wires in your plastic box.
If you don't do that, and you're in the States, and your house burns down, the insurance
company is going to find a way to deny payment because your electrical switch
wasn't properly grounded.

 

i cant help with the website but i can give a diagram...........................................................ok have one at the bottom of the stairs and the other at the top with both switced the same way when walking up turn the closest switch the other way the light turns on climb up switch the other it will turn off going down just do the same thing wire the out to the light like you where wireing on switch