New PDF release: Guidance Note 5: Protection Against Electric Shock (IEE

By Institution of

ISBN-10: 0852969937

ISBN-13: 9780852969939

A sequence of steering 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). every one of those publications is commonly cross-referenced to the laws therefore delivering handy and prepared entry. a few counsel Notes include info no longer incorporated within the sixteenth variation yet which used to be integrated in past versions of the IEE Wiring laws. all of the publications were up to date to align with BS 7671: 2001.

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

Sample text

2 If protection against indirect contact is to be provided by the residual current element of an RCBO the tabulated values of maximum earth fault loop impedance (Tables 41B2, 604B2 and 605B2) are not applicable and Regulation 413-02-16 applies. 413-02-16 Mixed disconnection times 413-02-13 The requirements for mixed disconnection times apply for any final circuits supplied from the same distribution board, distribution circuit or sub-main. This includes adjacent boards supplied from a common circuit or with a common bonding connection.

10 Earth-free local equipotential bonding 413-05 The application of this measure is strictly limited to special situations which are earth-free, and where its use is fully justified on operational grounds. e. not being Class II equipment or having equivalent insulation), will not operate satisfactorily if connected to a means of earthing. The location where the measure is applied may have a non-conducting floor, or a conductive floor which is insulated from earth and to which every accessible exposed-conductive-part within the location is connected by local equipotential bonding conductors.

542-01-03 PME sources offer a number of advantages over TN-S, among which are: — the connection with earth is more reliable not being dependent upon armouring continuity etc. — the PEN conductor, being of copper or aluminium, provides a lower impedance return path for earth fault currents than (say) steel armour or a lead sheath — use of the neutral as a combined neutral and protective conductor represents a material saving. Main equipotential bonding is an important requirement for installations supplied from TN-C-S (PME) systems, in view of the risk of danger in the event of an open circuit neutral fault on the distributor’s low voltage network.

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Guidance Note 5: Protection Against Electric Shock (IEE Guidence Notes) (No. 5) by Institution of


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