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Do-It-Yourself (DIY) Question & Answer Forum
2 way switching, 2 wire control, lighting problem
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<blockquote data-quote="BabyT" data-source="post: 413468" data-attributes="member: 27385"><p>Hoping for some advice.</p><p></p><p>My landing light stopped working (then started working again a week or so later and then has not worked for the last few months). The bulb is fine as I've checked it elsewhere.</p><p></p><p>From what I've been able to discover I believe my house uses a 2-way switch, 2 wire control wiring system (or cable saving system) for my landing light.</p><p></p><p>Two red switch-live wires (plus an earth) go from the downstairs switch (L1 and L2) in my hallway to the upstairs switch (L1 and L2) in my landing. A single red switch-live wire (plus an earth) then goes to the landing light. In addition, a single black wire goes from my landing light, into my roofspace and then disappears down the wall between my landing and my bathroom. I've not been able to find out where it then goes to.</p><p></p><p>My understanding was that this black wire should be the neutral wire, but what I've noticed is that when power is going to the light (i.e. the red switch-live wire has power in it) the black wire also has power in it (I'm only using one of the electrical tester screwdrivers to check for power). This occurs whether or not there is a bulb in the light fitting.</p><p></p><p>I had also thought that the power should only be able to get to the black wire by going through the bulb (to continue the circuit) so I removed the 3-spotlight light fitting and attached a simple pendant fitting but the same issue occurs.</p><p></p><p>Any ideas as to what the problem is and how best to resolve it so that my landing light will work again? Grateful for any feedback.</p></blockquote><p></p>
[QUOTE="BabyT, post: 413468, member: 27385"] Hoping for some advice. My landing light stopped working (then started working again a week or so later and then has not worked for the last few months). The bulb is fine as I've checked it elsewhere. From what I've been able to discover I believe my house uses a 2-way switch, 2 wire control wiring system (or cable saving system) for my landing light. Two red switch-live wires (plus an earth) go from the downstairs switch (L1 and L2) in my hallway to the upstairs switch (L1 and L2) in my landing. A single red switch-live wire (plus an earth) then goes to the landing light. In addition, a single black wire goes from my landing light, into my roofspace and then disappears down the wall between my landing and my bathroom. I've not been able to find out where it then goes to. My understanding was that this black wire should be the neutral wire, but what I've noticed is that when power is going to the light (i.e. the red switch-live wire has power in it) the black wire also has power in it (I'm only using one of the electrical tester screwdrivers to check for power). This occurs whether or not there is a bulb in the light fitting. I had also thought that the power should only be able to get to the black wire by going through the bulb (to continue the circuit) so I removed the 3-spotlight light fitting and attached a simple pendant fitting but the same issue occurs. Any ideas as to what the problem is and how best to resolve it so that my landing light will work again? Grateful for any feedback. [/QUOTE]
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