In article ,
"Peter" writes:
I have a drainage pump in a manhole which connects to armoured cable in a
box at the top (inside) the manhole.
All is well until the pump breaks down, water level rises and the box does
not keep the water out.
Local electric store says they have nothing to help so I wondered .....
can I literally fill the box with silicon to solve the problem.
At the outset the connection should have been made above ground ( a wall
about 8 feet away) but alas, there is now not sufficient cable to play with
meaning the connection has to remain inside the manhole.
Any help appreciated.

Well, it would certainly be possible to make up one using
appropriate sized cable glands and a gaskit sealed box.
Note that I don't believe even the CW SWA glands are
submersible, so you will probably have to use regular
(non-SWA) glands to seal against the outer sheath at the
box, and then use a standard BW SWA inside the box to make
a good connection to the armour (if necessary). The regular
glands will either need sealing washers against the box, or
use a sealant on the mating surfaces.
The box, being unvented, will form condensation, so make
sure you have large crepage distances between the connections.

Another option would be a submersible connector (B&Q had some
going cheap a couple of months back, which may mean they no
longer stock them) to join to a similar short length of rubber
cable, and a potted joint connecting that to the SWA. I don't
know what life you might expect from the submersible connector.

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]