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Old 5th Jun 2004, 13:38   #1 (permalink)

Yes, Him
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Join Date: Aug 1999
Location: West Sussex, UK
Posts: 2,690
UK Phone wire colour codes?

I have unearthed an old phone extension cable that I want to use.

Modern BT (Brit Telecom) wiring for extension is :
Terminal 2 Blue/white wire
Terminal 3 Orange/whiterings
Terminal 4White orange rings
Terminal 5 white/blue rings

Terminals 1 & 6 not used

However, the old extension cable has four wires coloured blue, orange. green and brown.

Anybody know which goes to which terminal?

Yrs, frustrated...
Gainesy is offline  
Old 5th Jun 2004, 13:44   #2 (permalink)

Join Date: Jul 2001
Location: Texas
Posts: 1,746
This isn't going to be a helpful answer but...

In America, standard phone wire is red + green + yellow + black. The service typically comes down red +green, with the other two being for redundancy or extra service.

Cat 3 (I think), cat 5 and cat5e use twisted pairs of white/orange + orange/white etc etc.

To hook up the phone, activate the service, then just find which two wires have a voltage across them - either
  1. try an old telephone and listen for a dial tone
  2. check with a meter
  3. check with a phone line tester

It can't be too much different from that I would have thought and I think it runs at a bout 60v over here, bt with very low current.

Onan the Clumsy is offline  
Old 5th Jun 2004, 13:47   #3 (permalink)
Join Date: May 2001
Location: Newcastle/UK
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Can't help you mr G, I ran a couple of extensions in me nephews house twas a bloody nighmare trying to figure out, someone had used a 5 pair cable in old telecom junction boxes, and had invented a colour code of their own I think.
Good luck.
tony draper is offline  
Old 5th Jun 2004, 13:58   #4 (permalink)

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Perhaps my logic has failed due to excess liquid indulgence last night but does it matter? Surely so long as each terminal in the plug goes to the corresponding terminal in the socket it'll work fine regardless of colour code even if its zebra print from T2 to T2 and paisley from T3 to T3 etc. And if the terminal numbers in the socket dont correspond in terms of physical location with those in the plug disregard them and go with the location instead. Its just an extension, you just need to connect pin to pin in the manner they would be sans extension. Am I missing something here? Brain not functioning correctly yet.
SyllogismCheck is offline  
Old 5th Jun 2004, 14:41   #5 (permalink)
Join Date: May 2002
Location: Cheshire, UK
Age: 49
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Check this out ;

UK Telephone cabling

Helped me out several times.
Lost_luggage34 is offline  
Old 5th Jun 2004, 15:38   #6 (permalink)

(a bear of little brain)
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Syllogism, in particular, but anyone in general.

I had exactly the same problem with the colour coding (striped wires into the socket, multi out). After many tries I managed to get it wired so all the phones worked as far as receiving or making calls went but with the problem that only the main house phone would ring.

Brother arrived (he being a trained electrickyone) and said exactly what Syllogism said:- "it don't matter what goes to what so long as it's the same colour to the same terminal". 15 minutes later all the phones in the house work (including ringing in) perfectly.

There are times I hate my brother.
MadsDad is offline  
Old 5th Jun 2004, 16:36   #7 (permalink)
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Location: Newcastle/UK
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Thats great in theory if the circuit leaving one end is the same colour that arrives at tother, and doesn't mysteriously change over in a hidden junction box somewhere.
tony draper is offline  
Old 5th Jun 2004, 19:09   #8 (permalink)
Join Date: Oct 2000
Location: London UK
Posts: 110
Trust me I'm a BT engineer, but not touched home telephone cabling in a proffessional capacity for some years. I somehow managed to keep hold of the tools when I moved on to better things though.

The link posted by Lost Luggage covers everything you need to know.
Sharjah Night Shift is offline  
Old 6th Jun 2004, 07:47   #9 (permalink)

Yes, Him
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OK, sorted, many thanks chaps.
Gainesy is offline  
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