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Amendment 3 to BS 7671: 2008

Wiring systems in escape routes

There have been tragic instances where internal access and escape from a building on fire has been hindered due to electric cables becoming detached from their supports entangling occupants and firefighters. In one instance, dropped cables in a corridor, together with large volumes of smoke and fire prevented firefighters from reaching a trapped occupier.

For these reasons, it is expected that Amendment 3 to BS 7671 will include a new Regulation; 521.11.201 in relation to the fixing of cables in escape routes requiring a suitable fire resistant means of support.

Proposed Regulation 521.11.201:

521.11.201 Wiring systems in escape routes shall be supported such that they will not be liable to
premature collapse in the event of fire. The requirements of Regulation 422.2.1 shall also apply, irrespective of the classification of the conditions for evacuation in an emergency.
NOTE 1: Non-metallic cable trunking or other non-metallic means of support can fail when subject to either direct flame or hot products of combustion. This may lead to wiring systems hanging across access or egress routes such that they hinder evacuation and firefighting activities.
NOTE 2: This precludes the use of non-metallic cable clips, cable ties or cable trunking as the sole means of support. For example, where non-metallic cable trunking is used, a suitable fire-resistant means of support/retention must be provided to prevent cables falling out in the event of fire.
Posted: 31st October 2014

For further information please contact: Hager Ltd, Hortonwood 50, Hortonwood, Telford, TF1 7FT. Telephone 01952 675612, Fax 01952 675557, Web: www.hager.co.uk, Twitter: @hageruk