C-H & Paul
The new ring main design rule in BS7671: 2001, Amendment No.1, February 2002, ammends Reg 433-02-04 to read:
"....Such ring final circuits are deemed to meet the requirements of Reg 433-02-01 if the current-carrying capacity (Iz) of the cable is not less than 20A, and if, under the intended conditions of use, the load current in any part of the ring is unlikely to exceed FOR LONG PERIODS the current-carrying capacity (Iz) of the cable."
These ammendments are available as a free download from the IEE website;
www.iee.org.uk, there are also ammendments to the current ratings for BS 6004 flat twin & earth cables.
Hope this helps.
[This message has been edited by David UK (edited 11-04-2002).]
