On Sun, 20 Mar 2005 19:16:21 +0000 (UTC), "Andrew Mawson"
wrote:


"Timbrook99" wrote in message
. com...
I have an old GPO jack plug fitted onto a standard wall box. I want
to replace it with an up-to-date socket so that I can use it. I
haven't been able to find its details online so if anyone can help,
I'd be grateful.

It was installed when the house was built, about 1970. It has five
terminals:

1 - brown wires (2)
2 - orange wires (2)
3 - blue wires (2)
4 - green (1)
4A - brown which is looped back to 1.

There are two cream-insulated wires coming into the box, since this
extension oulet is one of several in the house and the wiring goes
on
to the next room.

The fitting is flush to the wall with a standard metal box behind
it,
set into the wall exactly as a light switch would be.

The cream plastic face of the jack has "GPO" on it.

What is its model number and what which wires would I use when I
replace it with a standard extension socket?
Ta,


Sounds like a "jack 420" socket to me

It's actually a "Jacks 95A" and the corresponding plug is a "Plugs
420"...

As has already been said, this is a "Plan 4" installation, where
bell/s in the phone/s and a fixed bell are all in series, with a break
contact between terminals 4 and 4A in the jack/s.

If the line had been on "shared service" there would have been a
"Jacks 96A", with six terminals.
--
Frank Erskine
Sunderland