In the UK it's possible to get inexpensive pocket-sized metal/cable =

detectors, that help electricians determine the presence of screws, =

pipes, live cables etc. buried in walls. I wonder if one of these would =

detect a metallic object attached to the end of your fish tape? Maybe =

you could pulse a coil on the end at a few Hz, providing a way to =

distinguish the fish tape from other detectable objects.

See http://www.plumbworld.co.uk/0-16060 for inspiration.

Regards
Matt


Arkady wrote:
> Electricians use a tool known as fish tape to pull wires through conduits=
 in
> the wall. Sometimes the fish tape gets dead stopped in the wall. I need a
> (simple, cheap) device to determine where exactly in the wall the head of=
 a
> fish tape is stuck. Is it possible to use any readily available device for
> this, or if not, what principle of work can you suggest for such a thing?
> Generally there is not much room there in the conduit; the fish tape itse=
lf
> is some 6-8 mm in diameter usually made of a dialectical material. I think
> of two coils: one in operator=92s hands and another one (short-circuited)=
  -
> in the head of the fish tape. The impedance of the first one will depend =
on
> proximity to the other. Does this have any chances to work?
> Any thoughts will be highly appreciable. Thanks.
>
> Arkady

-- =

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