Tunnel lighting

[wattsup]

Do new apprentices still get the old question how to install tunnel lighting, where walking down a tunnel. 20 switches and 20 lights are installed at 10m intervals. the first switch turns the first light on, the second switch turns the first light off but also switches the second light on and so on down the tunnel, so always the the light behind goes off and the one in front comes on. Only 1-gang switches can be used, no relays contactors and it will work no matter which direction you enter the tunnel.
Show your circuit diagram.
...that was a laugh some of the diagrams were very complicated including my first attempt
Do apprentices do stuff like this now?

 

[Sintra]

Yes I can remember that one from a few years back. It took a bit of thinking out.

 

[Des 56]

Another

How would you manually switch the beacon light in a light house from every level of the stairwell

 

[benji]

pull switch with long chord


yours benji

 

[wattsup]

Mm, that would have to be 15kw (80 amp pull cord) or utilise a contactor..
Ok, only joking, i know now incandescent are banned, they use an 20w energy saving lamp (because that's equivalent to 15,000 watts, ships in danger at sea can see the light from as far away as 6ft...;-)

 

[a5r3]

who has got circuit diagram of tunnel wiring I cant figure it out myself

 

[tlangdon12]

Are two-way switches allowed for the tunnel problem? (I can't see how a one way switch can control one light but cut the power another.)

 

[Sintra]

Yes 2 way or even intermediate if you fancy as long as they are all only one gang.

 

[Robotstar5]

Reminds me of the PLC course where we had to write the software to control the traffic lights on a 4 way junction with pedestrian lights and get it on one page/screen.

 

[thekingiam]

i like the op s question might get a peice of paper and start remembering and,or,nand and not gates.

 

[thekingiam]

strugling with my home work here guys!
can get 1 st and second light in tunnel but am lost after that, answers on a postcard please!

 

[Brightspark2]

strugling with my home work here guys!
can get 1 st and second light in tunnel but am lost after that, answers on a postcard please!

Switch neutrals?...


Saw a smiliar question like this which involved switching neutrals...

 

[thekingiam]

hmm have another go later going to make a snow man.

 

[Sintra]

Switch neutrals?...


Saw a smiliar question like this which involved switching neutrals...

No neutrals switched in this circuit.

 

[KAS1]

My mate down the road saids he frinks hes onlys need 1 x 1 way switchy at the first light in the tunnels and at everyothers of lighties he would use 1 x 2way switchies hed say sumfring about live to commens at last lighty swich at far ends and l2 linkingging to commoms of the nxt switchy coming backwards to the next swiches and repeating all way bak to first swithy with a 1 x ways swithchy but I fink hes stupids does everyones agreeees