TV Schematic

How to draw a schematic diagram of a two-way lighting circuit?

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1. check this site out for some lighting schematics; http://www.act-solutions.com/kingery06.htm
2. ! ___red______ ! @______/ ___blk______ \______@___ ! |__________wht_____________|____ This textbox deletes whitespace
3. you mean 3 way
4. Assuming you are in the US. Ignore if you are not. Draw a line from the electric panel to the lamp. That is your neutral. Draw a line from the electric panel to the common screw on the 1st switch. That is your hot wire. Draw 2 lines between the switches on the runner or traveler screws. Those are the runners. Draw a line from the common screw on the 2nd switch to the lamp. That is your switched hot wire.
5. Using 1.0mm or 1.5mm twin & earth the mains supply will come in live (L) coloured red/ or now brown, neutral (N) coloured black/or now blue and earth (E) as a bare wire but which is sleeved with green/ or now green & yellow. The back of your ceiling rose will have four terminal fixing blocks to receive N, L and a Line/link and E . The mains supply will be N into the ceiling rose terminal N, the L into ceiling rose terminal L and the earth to the E terminal. . The wires from your actual light fitting, the bulb, will connect with the N into N terminal, and the L into the Line/link and if there is an E into the E terminal. Then from the four terminal blocks in the ceiling rose, again using 2 core ( twin & earth ) your switch cable takes a connection from the L of the ceiling rose to the terminal labelled L2 on the back of your first light switch. It takes a connection from the Line/link terminal to the terminal labelled L3 on the back of your first light switch and the earth wire is connected from the E in the ceiling rose to the E in the metal box in your wall which your switch fixes in. Then again using 1.0mm or 1.5 mm cable, this time with 3 core & earth, ( which in the old cables was coloured red, yellow, blue + earth ) take a connection ( red ) from the L2 on your first switch to L2 on your second switch. Take a connectiuon ( blue ) from L3 on your first switch to L3 on your second switch, make a connection ( yellow ) from L1 on your first switch to L1 on your second switch and connect the earth wire to the screw terminal in your first wall metal box and also to the earth screw in your second metal box. You have now linked the two switches for independant operation. You must fit some green/ yellow sleeving to the bare earth wires. Make sure all connections are tight. Always switch off at the mains before takling any work. This off course is purely academic because there are limits on what any handiman or even some electrians can legitimately do due to the new UK regs. and they have to have the appropriate ticket of competence. I think a competent non ticket person can do work and ask the local authority to approve it as an alternative form of compliance with the regs. If in doubt dont do it. Because of the change of colours in the cables any installation which mixes the old red/black with the new brown/blue must have a warning label fixed to the sytem. NB. Sometimes you will find different manf. identify the terminals in their switches differently, you may find instead of L1, L2 & L3 that they are identified as Common, L1 & L2 so check carefully. Also over the recent years with European harmonisation of colours you may find various combinations of the colour schemes.