Hi, I have a BT master socket located in the living room and need to run a
line out of the house to a detached building away from the house. Due to
the location burying a cable would not be possible (concrete drive etc.) and
i also do not want to run conduit as it will look unsightly. The type of
cable BT use looks perfect as i imagine this to be UV resistant and as they
wire me in from the post in the street the cable would be fine for me to use
outdoors. I have looked through Screwfix catalogue and online as well as
the local B&Q and the like but cant seem to find anything suitable! Has
anyone ever had to do such a job and if so where can i find the right cable?
You can buy exterior telephone cable, try
jelly-filled is for direct burial
You should only use <1m of exterior cable within the house (whether
jelly-filled or not) because the sheath gives of nasty fumes in a fire.
google "cw1378" or "drop wire" <sans quotes>.
You'll ideally need a couple of brackets and curly wurlys for each end.
CW1378 is the proper stuff but be aware that the outer jacket is very
tough giving the cable somewaht a mind of it's own. The cable is also
gell filled making working on the ends a bit messy, there are boots that
fit over the outer jacket to try and prevent the gel getting out in
service. The yellow wires are the steel strainers not signal wires.
If 100m is a bit much, it might be worth having a quiet and polite word
with an outside BT linesman... It appears that cw1378, cw 1378 or ("drop
wire", dropwire) is something you can't get from eBay!
Dave. pam is missing e-mail
Have you considered the type of cordless phones with two handsets? One is
the base unit but they both have chargers, and have a pretty good range. I
lent my elderly neighbour the 'second' one of mine when her phone was out
of action and it worked fine.
*Never underestimate the power of very stupid people in large groups *
Dave Plowman email@example.com London SW
Right - I sort of assumed it was some sort of workshop.
However, if you're talking computers, the best way IMHO is to have the
router/modem as close as possible to the incoming line and run CAT5 to the
computers. CAT5 can also be used for an ordinary telephone circuit.
*I love cats...they taste just like chicken.
Dave Plowman firstname.lastname@example.org London SW
Strange that GPO used two paralell wires for years. Long runs were
transposedbetween posts, so in some ways they were twisted. In the length
being considered here it would make no difference. The drop wire BT use is
not twisted where it is fastened to the building, but may be in the span (if
the installer CBA).
I think you will find that there is no two wire untwisted left anywhere
Just from the POV of hum pickup its pretty unacceptable.
All underground stuff is multiple pair twisted, and all overheads I have
seen in the last 30 years have been multiple twisted pair with a steel
core for strength.
The drop wire BT use for buildings is twisted all the way. I know cos I
I suspect you are thinking of single phase AC power lines which come in
as a true untwisted pair from overhead poles in older properties.
ADSL is deigned to work over twisted pair, period. Long runs of
untwisted will almost certainly degrade performance, possibly to the
point of unacceptability.
Al that is needed to run a remote overhead extension is steel cored 2
pair twisted. And some of those spirally strain relief things are not a
If its underground just get some plastic heating pipe, put some cat 5 or
phone extension up the middle, seals the ends with expanding foam or
silicone, and bury it.
Are you thinking of real dropwire? Dropwire is simply figure-of-eight
"flat" cable (occasionally it's three-core).
The lineman is supposed to twist it it in span a couple of times, but
this is to reduce the effect of wind whipping the wire.
I assume its what connects the pole to my home. Its not figure of eight
at all,. Its two pair twisted, round a steel core covered in black plastic.
I have no idea what you are talking about, because I have never ever
seen what I would call 'twin flex' used in a BT installation anywhere.
At all times what has come into the master socket has been one or more
twisted pairs, and what goes across the road is the same, and what goes
under the road is the same.
I've worked with BT, NTL, Jersey and Guersney Telecomms, and none of
them has ever used anything like what you describe anywhere.
I worked for 20 years for GPO, and my squash partner still works for
BT Openreach and carries reels of the stuff around on his van.
It's usually mid-grey in colour (not the van!). I wouldn't exactly
call it twin "flex", having a steel core :-)
Pretty sure the overhead pole to house cable on my property is figure of
eight/flat twin. Along the poles is multicore (presumably twisted). Mind you
mine has been there a while. Maybe it's just some old installations. No
doubt an ADSL connection might require that to be upgraded to newer
standards but there hasn't been the need to date (we have cable broadband).
I'll have to check now!
(anti-spam is as easy as 1-2-3 - not)
I disagree. My two overhead BT lines come in on cable that sounds just
like that described as drop wire - each is a single pair in a figure
of eight configuration in thick black plasic insulation. The wire
itself is very stiff and rather brittle. When BT changed the line a
few years back I nabbed the removed bit and pressed it into service
for a an extended bell push which is why I know how brittle it is -
doesn't like being wrapped round a screw terminal.
I still cannot fathom what this stuff is.
Do you mean the two strands are simply side-by-side? And the insulation
forms a figure of eight?
Or that the wires are laced together in some figure of eight twist?
I had my two lines pulled down by a tipper lorry, They replaced the two
pair twisted with more tow pair twisted. Its simply two twisted pairs
and a steel cord inside a black sheath.
Yes, figure of eight configuration wire is the conventional way of
describing two strands side by side each with circular insulation
fused together to form (in cross section) a figure of eight shape.
'bell wire' by convention takes the same form.
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