In 2008 the 17th Edition of the wiring regulations that are now called BS7671 will come into force.
The final copy is not available yet, but a draft was made avaialble for public comment. Let us look at some alterations between the draft and the present 16th Edition
In the draft it appears that the layout of the regulations follows the International Electrotechnical Commission’s (IEC) numbering system, this means that Part 6 and Part 7 are reversed.
Part 1 additions are protection against voltage disturbances and protection against electromagnetic influences
Part 2 includes some new and changed definitions
Part 4 includes several significantly changes, remember direct contact and indirect contact, these are now basic protection and fault protection respectively. A lot of jiggling with this part as taken place. Supplementry protection with the use of RCD comes under the heading of additional protection.
With the normalised voltage for the UK having changed to 230Volts the earth fault impedances shown in the tables are different.
More to come later
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