Outdoor security light replacement with 4 wires including yellow

[Mair]

I want to replace a sensor halogen security light which has an interior override switch. The wiring to the outside light is at the light red, blue, yellow, yellow/green. I know I cannot link all four wires but should I wire the blue, yellow and g/y and isolate the live red so that I can use the inside switch to on off on off overrride the sensor and have it on permanently sometimes? I am trying to work out what to do with the extra (live? Positive wire) . Thank you.

 

[bernardgreen]

This might help you

Colours may be different, possibly your Red is Live, your Blue is Neutral and your Yellow is the Switched Live.

Ypu probably do not have the Override Off switch which also acts as an Isolator that is useful if the lamp gets damaged/water logged and causes MCB or RCD in the consumer unit to trip

 

[Mair]

Bernard , thank you Very much. Do you think I can connect yellow, blue and y/g such that the inside switch will act as a switch to the unit? And then just isolate the red wire?

 

[SUNRAY]

This is certainly a very common way of wiring PIR lights:

and leaving the red disconnected (as indicated by a gap) is likely to disable the PIR, however there is no 'standard' way or colour code to follow and swapping over the use of red and yellow is not uncommon.

 

[Mair]

I see, very helpful, thank you.

 

[Taylortwocities]

How many terminals does you’d new light have?
Does it have a “pulse over-ride” facility?

 

[Mair]

I am not certain but they all seem to have. I am going to try the isolate red, use yellow for Live approach.

 

[Mair]

It’s a meikee. Trying to check