Is the use of 3mm sleeving on the CPC for ring main (2.5mm
T&E) and lighting (mix of 1.5mm and 1.0 mm) switches,
sockets etc likely to fail a PIR or other inspection - if
only on the basis of "good workmanship and practices"
please?

I've been using it as I had a reel and TLC had nothing
smaller in stock. But a comment overheard at the Screwfix
trade counter has left me a bit bothered, and I'd rather
re-do the work now than later.

--
Robin

In article ,
"neverwas" writes:
Is the use of 3mm sleeving on the CPC for ring main (2.5mm
T&E) and lighting (mix of 1.5mm and 1.0 mm) switches,
sockets etc likely to fail a PIR or other inspection - if
only on the basis of "good workmanship and practices"
please?

No.
What was your concern? That you could use something thinner?

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

No.

Thanks for that

What was your concern? That you could use something
thinner?


Yes - I thought I heard someone who appeared to be in the
trade (from the bulk of their order) say that 3mm was too
big. And I have in the past always used smaller sleeving
for CPCs when doing odd bits and bobs.

--
Robin

neverwas wrote:
No.

Thanks for that

What was your concern? That you could use something
thinner?


Yes - I thought I heard someone who appeared to be in the
trade (from the bulk of their order) say that 3mm was too
big. And I have in the past always used smaller sleeving
for CPCs when doing odd bits and bobs.

Its bigger and hence not as easy to work with in the confines of a
socket box etc, but I can't see any reason for it being unacceptable.

--
Cheers,

John.

/================================================== ===============\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
\================================================= ================/

John Rumm wrote:

Its bigger and hence not as easy to work with in the confines of a
socket box etc, but I can't see any reason for it being unacceptable.

And it's what almost everybody seems to use. I doubt that many
wholesalers even bother to stock 2 mm (although it's easy to get from RS
etc). 2mm definitely makes a better-looking job though.

What really needs stamping out is the old practice of twisting several
earths tightly together and sleeving the whole lot as one.

--
Andy

What really needs stamping out is the old practice of twisting several
earths tightly together and sleeving the whole lot as one.

--
Andy

Why is that bad practise?

coughed up some electrons that declared:


What really needs stamping out is the old practice of twisting several
earths tightly together and sleeving the whole lot as one.

--
Andy

Why is that bad practise?

It can make it difficult to break the circuit at that point for testing (eg
a PIR).

Cheers

Tim

wrote:
What really needs stamping out is the old practice of twisting several
earths tightly together and sleeving the whole lot as one.

Why is that bad practise?

Testability & maintainability: it make it difficult to disconnect
individual conductors where necessary for testing (either initial or
PIR) or during fault tracing.

Alterations: it can be a pain when adding or removing cables during
alteration work.

Conductor identification: all conductors in an installation should be
identifiable.

Also tight twisting work-hardens the conductors and renders them liable
to break when being disturbed, giving more grief during any of the above
operations.

See also the post by John Peckham in this thread:
http://www.theiet.org/forums/Forum/m...threadid=23723
--
Andy

Andy Wade wrote:
John Rumm wrote:

Its bigger and hence not as easy to work with in the confines of a
socket box etc, but I can't see any reason for it being unacceptable.

And it's what almost everybody seems to use. I doubt that many
wholesalers even bother to stock 2 mm (although it's easy to get from RS
etc). 2mm definitely makes a better-looking job though.

Just had a look at my bundle of it - turns out that is 3mm as well...

What really needs stamping out is the old practice of twisting several
earths tightly together and sleeving the whole lot as one.

Indeed!

--
Cheers,

John.

/================================================== ===============\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
\================================================= ================/

In article ,
John Rumm writes:
Andy Wade wrote:
John Rumm wrote:

Its bigger and hence not as easy to work with in the confines of a
socket box etc, but I can't see any reason for it being unacceptable.

And it's what almost everybody seems to use. I doubt that many
wholesalers even bother to stock 2 mm (although it's easy to get from RS
etc). 2mm definitely makes a better-looking job though.

Just had a look at my bundle of it - turns out that is 3mm as well...

I seem to have 3mm and 5mm.

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

"John Rumm" wrote in message
news
Andy Wade wrote:
John Rumm wrote:

Its bigger and hence not as easy to work with in the confines of a
socket box etc, but I can't see any reason for it being unacceptable.

And it's what almost everybody seems to use. I doubt that many
wholesalers even bother to stock 2 mm (although it's easy to get from RS
etc). 2mm definitely makes a better-looking job though.

Just had a look at my bundle of it - turns out that is 3mm as well...

I also use 3mm.

Although I do keep a stash of about 10m of 6mm for the 16mm T&E etc stored
under the drivers seat along with the 3mm red and black off cuts that should
last for years.

Adam