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Legislation
                                   
                                   
                                   

                                  Special Installations

                                   
                                   

                                  Part 7, sections 700 to 712,717,721,740,753

                                  A number of special locations are detailed which have further requirements than listed in the general 17th edition. They vary from a location containing a bath or shower, to floor and ceiling heating systems.

                                   

                                  Residential Requirements

                                   
                                   

                                  Example
                                  In areas that can have an extra risk for people, additional protection will be required, generally in the form of residual current devices. However other means can be employed in certain instances.

                                  What it means
                                  In any location which contains a bath or shower, sauna or swimming pool, the effects of electric shock on a person could well be magnified by up to 25%, so additional protection is required in these locations.

                                  Solution
                                  Supplies into these locations should be protected by 30mA residual current devices, either RCCB or RCBO and must be circuits arranged to minimise the effects on other circuits if devices operates.

                                   

                                   
                                   

                                  Commercial Requirements

                                   
                                   

                                  Example
                                  In areas which can have an extra risk for people additional protection will be required, generally in the form of residual current devices. However other means can be employed in certain instances.

                                  What it means
                                  The same measures for residential apply to the commercial market. If there is an extra risk to persons, then additional protection must be employed, for instance in agricultural premises.

                                  Solution
                                  Part 7 will detail the sensitivity of additional protection for the various locations which include construction or demolition sites, marinas and exhibitions. Circuits should be arranged to minimise disruption in the event of a fault operating a protection device.

                                   

                                   
                                   
                                    
                                   
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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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