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A Practical Guide to the Wiring Regulations

A Practical Guide to the Wiring Regulations


  1. Plan and terminology of BS 7671:2008 and supporting publications
  2. Electricity, the law, standards and codes of practice
  3. Scope, object and fundamental principles
  4. Assessment of general characteristics
  5. Protection against electric shock
  6. Protection against thermal effects
  7. Protection against overcurrent, undervoltage and overvoltage
  8. Isolation and switching
  9. Equipment selection: common rules
  10. Wiring systems
  11. Switchgear, protective devices and other equipment
  12. Protective conductors, earthing and equipotential bonding
  13. Specialized installations
  14. Safety services
  15. The smaller installation
  16. Special installations and locations
  17. Inspection, testing, certification and reporting

preface : 

The revised HDs have led to changes in, amongst other things, the various protective measures specified in Part 4 of BS 7671 and the requirements for special installations or locations. Not the least of the changes are those affecting the general requirements for protection against electric shock, which have been restructured and are subject to new terminology. Another notable change is that it is now permitted to install general-purpose socket-outlets in locations containing a bath or shower, provided these outlets are at least 3 m horizontally outside the boundary of zone 1 and the circuit supplying them is provided with additional protection by an RCD having specified characteristics (as must be all the circuits of the special location).

The newly introduced HDs have led to the addition of new sections in BS 7671 relating to: marinas and similar locations; exhibitions, shows and stands; solar photovoltaic power supply systems; mobile or transportable units; caravans and motor caravans (previously covered in Section 608 of BS 7671:2001); temporary installations for structures, amusement devices and booths at fairgrounds, amusement parks and circuses; and floor and ceiling heating systems.

While many changes have been associated with CENELEC HDs, a number of modifications made have been initiated in the United Kingdom. These primarily relate to cables concealed in walls and/or partitions in installations that are not intended to be under the supervision of a skilled or instructed person. In many cases, such cables are now required to be provided with additional protection by an RCD having specified characteristics, unless other specified protective provisions are employed.



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