By Institution of Electrical Engineers

A sequence of steerage Notes has been issued, each one of which enlarges upon and amplifies the actual standards of part of BS 7671:2001 (IEE Wiring laws, sixteenth Edition). every one of those publications is commonly cross-referenced to the laws hence delivering handy and prepared entry. a few tips Notes comprise details no longer integrated within the sixteenth version yet which was once incorporated in prior variations of the IEE Wiring laws. the entire publications were up-to-date to align with BS 7671: 2001.

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Additional resources for Guidance Note 7: Special Locations (IEE Guidence Notes) (No 7)

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25 is a factor to compensate for an underestimate. Ze = the external phase-neutral/earth loop impedance. (2R1)p = the primary circuit phase plus neutral conductor impedance. RCDs are commonly used to protect building sites, the installation being treated as a TT system with a separate earth electrode. 5 of the chapter on agricultural installations for maximum values of the resistance to earth (RA). 6 604-05-01 Isolation and switching 604-11 Section 604 repeats emergency switching requirements of Section 463 that emergency switching shall be provided on the supply to all the equipment from which it may be necessary to disconnect all live conductors in order to remove a hazard.

3 shows typical arrangement. 4. These may be radial 30 or 32 amp busbars with tee-offs to individual sockets. The main PE busbar will need to meet one or more of the requirements of Regulation 607-02-04, having a protective conductor with a cross-sectional area not less than 10 mm2 or duplicate protective conductors each of cross-sectional area sufficient to meet the requirements of Section 543. 4 Spurs from a 30 A or 32 A busbar Busbar L N PE 10 mm2 PE If protective conductor current is likely to exceed 10 mA a 4 mm2 PE with mechanical protection or a duplicate PE is required.

As it is not possible to ensure that only Class II equipment will be used, a double-pole RCD, which may also serve as the main isolating switch, must be provided within the caravan. This is additional to the RCD required at the pitch socket-outlet and affords protection within the caravan. The RCD at the pitch socket provides protection against faults between the pitch socket and the caravan and also in the caravan. 4 Protection against overcurrent Overcurrent protective devices for final circuits are required to disconnect both phase and neutral conductors, necessitating the use of double-pole circuit-breakers.

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