ECN Forum Forums General Topics of the Trade Non-US Electrical Systems & Trades Why is it always 555 ?

Paul,
Sorry to briefly change the subject,
but, what sort of phone plug is a BT plug referenced to BS6312?.

BS6312 is the normal plug which has been standard here since the early 1980s. The 4-wire version is known as type BT431A by British Telecom (the 6-wire type is BT631A):



The only problem is that by way of the usual bureaucratic processes, the British Standards Institute managed to number the pins the opposite way round to the original BT standard, e.g. what BSI calls pin 1 is really pin 6!

Now you see why we have definitions such as this:
committee: A life-form with 12 heads and no brain.



[This message has been edited by pauluk (edited 04-14-2003).]

Hear, Hear, Paul!.
Paul, the reason I asked you that, was because we have just had a new Standard come out over here for the Installation of outlets for telephones(2-wire) and for ADSL (Jetstream, it's called over here)installations.
But, what confused me was, the fact that they used the RJ-45(I already know what this looks like)term, but for the Standard outlet for households, there was this: BT to BS 6312 plug, all the way through the Standard, and this was written with the DIY person in mind too!.
Somehow, Paul, I don't like the idea of DIY people fooling around with telephone circuits, especially where the chances of the phone system "accidentally" being inter-connected with the Mains, poses a very real possibility.
What are your thoughts?.

Well, as someone who has spent a lot of time working on telephone lines on poles or in waterlogged manholes, I certainly don't like the idea of somebody injecting 240V onto the line!

I suppose if the DIYers just stick to running extension telephone sockets which aren't integrated with any other wiring systems, then there's little chance of them doing something that drastic.