British standard 7671 refers to electrical wiring regulations (17th Edition). they include;
Consumer units (to come into effect January 2016)
Wiring in escape routes
Changes to earth fault loop impedances for all protective devices
Updated EIC and EICR forms
Changes to definitions throughout the Regulations
BS 7671-2008 is the 17th addition of the UK electrical code book. As the tests were not stated by the question an answer to this question can not be answered.
The On-Site Guide is one of several publications that provide guidance on various aspects of BS 7671:2008 Requirements for Electrical Installations, commonly known as the IEE Wiring Regulations.It provides a background on the intentions of BS 7671:2008 and provides a simple guide to that publication. Electricians, however, are responsible to ensure that they comply with the requirements of BS 7671:2008.
appendix 3 from BS 7671:2008
Currently; "BS 7671 Requirements for Electrical Installations. The IEE Wiring Regulations" With the first amendment of the 17th edition of BS 7671 due to be issued in a matter of weeks and the "IEE" being changed to "IET" on the document, what else differs is relatively unknown at present.
The industry covered by BS 7671 is the electrical industry. Because rules and regulations are always changing, one can find the current regulations at the online site "Theiet".
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BS 7671; The IET Wiring Regulations (currently the 17th edition: 2008, with a first amendment made in July 2011) is a non-statutory document. However, the electrical industry deem it to be a minimum technical standard generally expected. If you had selected a way of designing/installing/verifying an installation or part of it, to a method other than as per stated within BS 7671, but it was equivalent in regards to safety, etc., then you may have a justifiable defense against legal issues.
If you are referring to residential wiring, then refer to the appropriate tables in BS 7671:2008 Requirements for Electrical Installations (the IEE Wiring Regulations). It's too complicated to be answered in this forum and requires prerequesite knowledge you may not have.
It depends on whether it is copper or aluminium, what its cross-sectional area is, and how it is to be installed. If you know all these things, then you can look it up in the tables provided in your country's wiring regulations. In the UK, this is BS 7671:2008 Requirements for Electrical Installations.
BS 7671:2008, Requirements for Electrical Installations, specifies that any number of socket outlets can be added to a final ring circuit (ring main), but the ring main must not supply a floor area exceeding 100 square metres.