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

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).]