Download Guidance Note 5: Protection Against Electric Shock (IEE by Institution of PDF

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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 widely cross-referenced to the rules therefore offering handy and prepared entry. a few information Notes comprise info no longer integrated within the sixteenth variation yet which used to be incorporated in past variants of the IEE Wiring rules. all of the publications were up to date to align with BS 7671: 2001.

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Additional info for Guidance Note 5: Protection Against Electric Shock (IEE Guidence Notes) (No. 5)

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2. 2 Final circuits having 'mixed' disconnection times (Regulation 413-02-13) 413-02-13 distribution board circuit A L exposed-conductive-part fixed Load B circuit B load A (indoors) 230 V Uf N main earthing terminal If E protective conductor in cord Rc main equipotential bonding conductor further equipotential bonding conductor (if necessary) extraneous-conductive-part earth CD GN5 Protection Against Electric Shock, inc 16th Edition 2001 Amd No 1 37 Both circuits are fitted with fuse devices for protection against overcurrent and indirect contact.

3 SELV SELV (separated extra-low voltage) is an ELV system which is electrically separated from earth and from other systems in such a way that a single fault cannot give rise to the risk of electric shock. It should be appreciated that if a single fault were to occur it is intended that this should be confined to the SELV system and not involve any conductive parts of another system. Thus, the construction of a SELV system necessitates the use of high-integrity equipment and materials. g. a battery or an engine-driven generator, and if there is no other electrical system in the vicinity, the precautions to be taken relate only to the ELV system itself.

471-16 The primary circuit to a 415/110 V or 240/110 V portable transformer unit when used outdoors must be RCD protected to comply with the above-mentioned requirement. 7 Automatic disconnection and alternative supplies An important aspect of providing protection against indirect contact which can be readily overlooked by the designer is the need to ensure satisfactory operation of the relevant protective device(s) when the installation, or part thereof, is energised from a second source. This may be an alternative LV feed, a standby generator supply or an uninterruptible power supply (ups).

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