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Legislation
                                   
                                   
                                   

                                  Definitions used in BS7671:2008

                                   
                                   

                                  Part 2, listed in alphabetical order

                                  Definitions used, as far as can be, are the same as those used in the International Electrotechnical vocabulary and also BS4727.

                                  Residential Requirements

                                   
                                   

                                  What it means
                                  Most circuits which require additional protection will need to have Residual Current Devices with a sensitivity of 30 mA.

                                  Solution
                                  Use RCBO’s for individual circuit protection which incorporate overload, fault and additional protection or group circuits fed from a Residual Current Circuit Breaker with individual overload and fault protection for each circuit.

                                   

                                   
                                   

                                  Commercial Requirements

                                   
                                   

                                  What it means
                                  Sockets which are for use by ordinary persons and under 20 amp (someone who is neither a competent or instructed person) need additional protection as above..

                                  Solution
                                  These sockets need to be protected with 30 mA residual devices unless the use is under the supervision of a competent or instructed person or cannot be accessed by an ordinary person. Various solutions exist depending on the type and use of the installation.

                                   

                                   
                                   
                                   
                                   
                                   
                                   
                                   
                                   
                                   

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                                  The 17th Edition explained...

                                  Read our bite-sized guides for a breakdown of the key changes within the 17th edition wiring regulations

                                  1. Scope of the BS7671:2008
                                  2. Definitions used in BS7671:2008
                                  3. Assessment of Characteristics
                                  4. Protection for Safety
                                  5. Erection of Equipment
                                  6. Inspection and Testing
                                  7. Special Installations
                                   

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