S
sparky in training
Hi All
I was replacing some faulty fluorescent lights yesterday when I cam across one with an emergency light attached to it. It was non maintained as once I had isolated power it switched on. When I cam across this light I could see it was an afterthought as the original light was wired in old colors, red black and green for earth whereas the EM light had new colors.
Turned out to be a tricky job because the new light wouldn't fit where the old light was so I had to adjust things and trim conduit back etc. Ended up just using push connectors to rewire the fitting.
Anyway, my question was what causes this EM light to switch on when power is disconnected, it has a permanent live going to it to charge the battery, is there some sort of relay internally that allows the battery to take over and power the light? For that matter, do maintained EM lights have a relay that switches over to battery supply?
I was replacing some faulty fluorescent lights yesterday when I cam across one with an emergency light attached to it. It was non maintained as once I had isolated power it switched on. When I cam across this light I could see it was an afterthought as the original light was wired in old colors, red black and green for earth whereas the EM light had new colors.
Turned out to be a tricky job because the new light wouldn't fit where the old light was so I had to adjust things and trim conduit back etc. Ended up just using push connectors to rewire the fitting.
Anyway, my question was what causes this EM light to switch on when power is disconnected, it has a permanent live going to it to charge the battery, is there some sort of relay internally that allows the battery to take over and power the light? For that matter, do maintained EM lights have a relay that switches over to battery supply?