Lighting Circuits

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I am familliar with the loop-in system of wiring lights, and with the old junction box system. However, I have recently replaced some ceiling rose and pendant light fittings for my dad. With the loop-in system, you get three two-core and earth cables (or two if it is the end light), and if it is a junction box circuit, you have one two-core and earth. However, what I found was two two-core and earth and a single core cable. Also, I isolated the circuit by turning on the light then turned off the MCB which turned off the light, just to be sure that I turned the right one off (it was the landing light, and I didn't know if it was supplied by the upstairs lighting circuit or downstairs.) The downstairs lighting MCB turned off the landing light, so I assumed it was isolated. It was not, as I found out later. So, what type of wiring is this, and why las it still live after it was supposedly isolated?
 
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this shouldn't be done if the lights are on different cuircuits but often is
 
When you say "live", what do you mean?

You said:
Also, I isolated the circuit by turning on the light then turned off the MCB which turned off the light,

so if you turned off the MCB, and the light went out, how could it have been live?

If you mean that at some point you got a jolt, or a pesky neon scredriver lit up, I suspect you have a borrowed neutral...

(See //www.diynot.com/forums/viewtopic.php?p=123427#123427 for an explanation)
 
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what it seems like to me is the following:

i bet he has the cuircuit i posted wired accross the cuircuits

i think he turned off the downstairs breaker and the light went out. but that left a PERMANENT LIVE to the light from the upstairs cuircuit.

i presume when he says "i found out later" he means he got a shock from the permanent live from the upstairs cuircuit.
 

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