T i m wrote:
On Sat, 22 Sep 2018 02:15:43 -0700 (PDT),
wrote:
On Friday, 21 September 2018 23:46:35 UTC+1, T i m wrote:
I'm guessing grommets wouldn't apply to a plastic backbox would they?
No,
Gdgd.
but given how sharp some plastics can be compared to PVC sheating,
perhaps they should.
But what is the purpose of the grommets ITRW? If they are to protect
the cable as it's drawn though the punched hole in say a steel backbox
then the chances are the grommet will pull out anyway? If it's there
to prevent the sharp edge of such a hole cutting though the cable
sheath and conductor insulation once fitted, what sort of vibration
are you expecting in this house? ;-.
Just to get back on topic, I've cut through the wire insulation pulling
a socket out to get at the terminal screws in the course of adding a
socket to a ring. Didn't help that the person who left the grommet off
also stripped the cable sheath back to outside the back box, presumably
to give himself more room to connect three 2.5mm^2 cables to the socket.
Whenever I've fitted a metal box and wiring, when I leave the cables
as they enter the box they would be 'formed' so tat they would sit
with the least possible pressure between cable and box (I do fit
grommets in any case of course).
This would have made it less likely, but not impossible if you omitted
the grommet and it was a very sharp edge.
I used grommets on my meter tails into the CU to tidy up my manky drilled
holes.
Hehe.
Again, I don't generally make manky holes (have a good selection of
tapered / stepped drills and will generally de burr them in plastic or
steel).
Ok, it does take me longer to do stuff but I can't generally do it any
other way ...
Cheers, T i m
--
Roger Hayter