MikeCapon
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| posted on 24/11/10 at 07:56 AM |
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Any electricians?
Bit OT but I know this is still the best place to ask... 2 questions about (house) electrickery.
First off, I've had to pull some mains cable underground to a pair of gate pillars. To run the buried cable it's in 40mm bright red
convoluted tubing stuff. When it comes out of the ground I'd prefer to run some smaller (16 or 20mm) more discrete (grey or black) tubing. My
question is, how do you join the two? Is there a widget available for this? I don't want to just use tape as the joint is bound not to be 100%
reliable over time and with the joint being vertical and the 40mm tube being at the bottom it will probably fill with rainwater.
Second one is another joining question. I need to splice some co-ax (tv only) and have not got any F connectors. If I solder the carrier wire, tape
over and join the shielding with aluminium foil and then cover with tape, will that work? It's only for a temporary fix and for reasons
associated with the gate question above, getting to the DIY shed is a bit difficult...
Thanks in advance,
Cheers,
Mike
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balidey
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| posted on 24/11/10 at 08:00 AM |
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I don't know of any 'widget' (I'd call it a reducer  ) but I would make sure plenty of the smaller tube goes into the larger
one and then fill the gap between the two with squirty expanding foam. Then when its set tape over the top of that?
Dutch bears have terrible skin due to their clogged paws
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rgrs
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| posted on 24/11/10 at 08:16 AM |
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Have a wander down the waste pipe plumbing section in your local b&q, you should find some black rubber push fittings designed for sealing
different size wast pipe, they are uncut so should do the job.
Roger
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bitsilly
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| posted on 24/11/10 at 09:03 AM |
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The co-ax join should work, but I wouldn't bother with tin foil as the absense of that much shielding won't matter. Be careful to keep the
shielding and the wire apart, and if you have a booster adjust it a little afterwards. I personally wouldn't bother soldering either, just twist
together. This would be a bit easier if all three wires are co-linear first ie coming in from same direction. Strip the shielding back and inch or so
and twist together, leave the inner insulation for half that inch, then twist the wires together.
I am now preparing to be shot down and told off!
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dhutch
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| posted on 24/11/10 at 09:36 AM |
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Twisting together coax is fairly horrable and if you do it much, depending on signal strenght, it will end in poor image quality. However, it does
work fairly well all things considered and isnt dangours. I would just use some choc block, signal wire into one, sheild into the other, done strip
off more than needed but dont worry about tin foiling it, dont let them touch!
For the gate, i like the idea of rubber uncut reducers, but equally a bit of spray foam goes a long way if you have an open can of it. Wouldnt worry
to much about the pipe filling with water but you want to keep soil etc and small animals out else should the cable ever want replacing it will be
full of stuff! Also, have you left a lenght of rope down as a cable pull?
Daniel
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big-vee-twin
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| posted on 24/11/10 at 09:55 AM |
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You could use Denso tape to seal your duct, its a grease laiden tape that is waterproof and will last, very messy though
Duratec Engine is fitted, MS2 Extra V3 is assembled and tested, engine running, car now built. IVA passed 26/02/2016
http://www.triangleltd.com
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daniel mason
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| posted on 24/11/10 at 12:36 PM |
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What sort of cable is in the ducting? And personally I would put a y connector on the co ax if you are connecting 3 wires. Or. Male and female
connector if 2!
[Edited on 24/11/10 by daniel mason]
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Confused but excited.
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| posted on 24/11/10 at 01:28 PM |
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I have used solder and foil for co-ax as an emergency repair on a cctv system. It worked ok for years.
I hope the mains cable is armoured. It should be in a trench at the correct depth with concrete coping over and hazard warning tape on that before
burying.
Tell them about the bent treacle edges!
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tegwin
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| posted on 24/11/10 at 03:10 PM |
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I hope you are using armoured cable under the ground.... or a suitably solid conduit at a reasonable depth 
Get a steel/plastic back box and screw it to the gate post about a foot above floor height... bring the duct/conduit out of the ground and into the
bottom of the box, use a gland on the cable/conduit to seal it.... from there run some standard plastic round conduit up the gatepost from the back
box :-) Simples
Something like this
http://www.remotecontrolgates.co.uk/contents/media/l_electric%20gates%20picture%20slim%20kit.jpg
[Edited on 24/11/10 by tegwin]
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Would the last person who leaves the country please switch off the lights and close the door!
www.verticalhorizonsmedia.tv
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fazerruss
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| posted on 24/11/10 at 11:16 PM |
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Although not at all dangerous or risky coax should not be spliced into another without using a propper y splitter or matching resistors. The reason
being tv coax has an impedance from its shield through the dilectric insulator to the solid core of 75ohms. Splicing another cable in can cause signal
probs as the impedance drops to 37.5 and may cause probs later on with the tuner in your telly.
"if assholes could fly this place would be an airport"
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MikeCapon
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| posted on 25/11/10 at 08:38 AM |
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Many thanks to all of you for your helpful replies.
Balidey, I like your idea and I'm doing a load of PU foaming at the mo changing windows and doors. It's got to be more reliable than bungs
or tape and it still remains 'undoable' if that's a real word.....
As for the co-ax Q it was just a question of adding length, not a Y joint. This I've now done as originally proposed. Solder, tape, foil + tape
and it works a treat. This was of course the no 1 priority as the other members of this household need the TV to watch while I'm outside working
in the cold
Thanks again.
Cheers,
Mike
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