how to find lost electric cable in ceiling ?

[x]

Ive installed a new plasterboard ceiling over an existing plaster ceiling. I
forgot to pass the cables through the new plasterboard for one of two
ceiling lights. To try and find it , Im thinking of passing something like a
mini webcam fixed on a flexible bit of something (1.6 mm aluminium perhaps
?) through the one opening I did remember to create.

Plumbers use a fibreoptic device to look for blockages in sewer pipes but i
havent got access to one of those.

I havent got a lot of room between the back of the plasterboard and the
fixing battens say 40mm.

Any ideas ? Thanks

 

[Mike Diack]

Ive installed a new plasterboard ceiling over an existing plaster ceiling. I
forgot to pass the cables through the new plasterboard for one of two
ceiling lights. To try and find it , Im thinking of passing something like a
mini webcam fixed on a flexible bit of something (1.6 mm aluminium perhaps
?) through the one opening I did remember to create.

Plumbers use a fibreoptic device to look for blockages in sewer pipes but i
havent got access to one of those.

I havent got a lot of room between the back of the plasterboard and the
fixing battens say 40mm.

Any ideas ? Thanks

I recently did a new room and forgot to mark some of the cable
locations in the ceiling, so hooked a signal generator to each cable
in turn where it appeared at the light switch and traced the cables
with a small portable radio. Was accurate to within 50mm in all cases.
M