Making twisted cable

In article , Mr Sandman writes

you're not joking!

Cat5 network cable will be fine and is dirt cheap. You'll only use one pair out of the four, but it doesn't matter.

cat 5 e is not thick enough for the distance, they recommend at least

In article , Mr Sandman writes

you're not joking!

Cat5 network cable will be fine and is dirt cheap. You'll only use one pair out of the four, but it doesn't matter.

The cable shown is 16 AWG or approx 1.3mm² - so may be carrying a fair bit of DC to power the remote.

You need to tell us more about the intercom. It could be that the pair is being used to power the thing as well as carry low level audio.

This any good?

or if it's in ducting / cnduit, buy a couple of 100 m rolls of 1.5 mm conduit cable and twist them with a drill.

Andrew

In article , Dave Plowman (News) writes

Double (or more) the pairs up, then, e.g. use both blue and blue/white wires for +ve and both green and green/white wires for -ve.

Still leaves you with two spare pairs.

In article , Andrew Mawson writes

at 1.91 per m, it's gonna cost £191 for the 100m the OP wants?

Yep. Or use singles and a drill. Twist then tug a bit to set it.

NT

It's speaker cable -

Look for a Belden 8471 equivalent. A quick search brings up these (neither of which I've heard of so I can't vouch for them).

Unless you really need the LSZH bit it's a lot cheaper.

You need to look at the electrical requirements to see if Cat 5 (as suggested by others) would do. Its DC resistance is much higher.

But don't do it too much, or you'll go blind

I have done this in the past.

For a suspended wire, you might also want to twist in a catenary wire, to provide enough tensile strength to carry the weight and wind forces over a long span.

You need to tell us more about the intercom. It could be that the pair is being used to power the thing as well as carry low level audio.

You would be better off doubling up by using the blue and green as +ve and the blue/white and green/white as -ve.

I would try a loudspeaker cable such as

cores are twisted on a 100 mm lay. £72 + VAT per 100 metres for the 1.5mm 2 core.

Power consumption by the gate units is DC 24V (supplied by PS1-24V or PS5-24V) Working status 200mA Lock Power supply: 12Vdc, 300mA(Internal Power)

Owain

blue/white

Why?

Bell wire's 1/10th the price. Vdrop is 44mV/A/m for 1mm2 for pvc, so 0.22v/ A/m for 0.2mm2 or 66mV/m at 0.3A -> 6.6v @ 100m 0.3A. If I designed the int ercom I'd make it work with that drop, but if they ask for 1.5mm it probabl y won't.

NT

blue/white

Why?

To make use of the twisted pair.

eh? The pairs are / not / or /.