By Institution of Electrical Engineers
A chain of steerage Notes has been issued, every one of which enlarges upon and amplifies the actual specifications of part of BS 7671:2001 (IEE Wiring rules, sixteenth Edition). each one of those courses is commonly cross-referenced to the laws hence supplying handy and prepared entry. a few assistance Notes include details no longer integrated within the sixteenth variation yet which was once incorporated in past versions of the IEE Wiring rules. the entire publications were up-to-date to align with BS 7671: 2001.
Read or Download Guidance Note 7: Special Locations (IEE Guidence Notes) (No 7) PDF
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Additional resources for Guidance Note 7: Special Locations (IEE Guidence Notes) (No 7)
G. lead. Fixed cables not permanently immersed or at a depth of less than 4 m should be armoured and incorporate extruded polythene bedding and outer sheath. 4) Due to the possibility of corrosion, the galvanised steel armouring of cables must not be used wholly or in part as a circuit protective conductor (cpc) on the floating section of marinas. A separate protective conductor should be used which, when in accordance with Regulation 543-01-02, can be common to several circuits if necessary. The armour must still, however, be connected to protective earth.
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.
2 The risks The risk associated with final circuits with high protective conductor currents is that resulting from discontinuity of the protective conductor. In installations where there are high protective conductor currents, serious shocks can be received from accessible conductive parts connected to protective conductors which are not connected to the main earthing terminal. This shock risk is extended to all the items of equipment on the particular circuit, whether they individually have high protective conductor currents or not.