BS 6724:1997+A3:2008
Electric cables — Thermosetting insulated, armoured cables for voltages of 600/1 000 V and 1 900/3 300 V, having low emission of smoke and corrosive gases when affected by fire

Standard No.

BS 6724:1997+A3:2008

Release Date

1997

Published By

British Standards Institution (BSI)

Status

Be replaced 2016-04

Replace By

BS 6724:2016

Latest

BS 6724:2016(2017)

Replace

91/28032 DC-1991 93/207995 DC-1993 BS 6724:1990

Scope

This British Standard specifies requirements for construction and describes methods of test for armoured cables with thermosetting insulation of rated voltages 600/1 000 V and 1 900/3 300 V which, when assessed by the specified tests, produce lower levels of smoke and corrosive products under exposure to fire compared with cables conforming to BS 5467 %Text deleted&. Cables specified in this standard are intended for use in fixed installations in industrial areas, buildings and similar applications. In this standard, the level of corrosive (and acid) gases is determined by measurement of hydrochloric acid (HCl) in accordance with !BS EN 50267-2-1". The insulation and other components are suitable to permit operation of the cables at a maximum sustained conductor temperature of 90 °C and for a maximum short-circuit conductor temperature of 250 °C. NOTE 1 Limitation on the temperature of the cables may be imposed in situations where they may be touched. NOTE 2 Due to the relatively high conductor temperature, there is a risk of drying out the surrounding soil causing an increase in thermal resistivity which in turn would lead to the cable temperature rising to a higher value than anticipated. For cable laid directly in the ground, a suitable de-rating factor should be applied or a lower maximum sustained conductor operating temperature should be assumed to take into account the possible effects of soil drying out. NOTE 3 In installations which include cable joints and terminations, the performance of these accessories should be taken into account in deciding the maximum operating temperature of the cable. The cables specified in the standard are all wire armoured and oversheathed, as follows: a) 600/1 000 V: single-core stranded copper conductor; single-core solid aluminium conductor; two-, three-, four- and five-core stranded copper conductor; two-, three-, and four-core solid aluminium conductor; multicore auxiliary stranded copper conductor. b) 1 900/3 300 V: single-core stranded copper conductor; single-core solid aluminium conductor; three-core stranded copper conductor; three-core solid aluminium conductor. Annex A gives recommendations for the selection and operation of cables while recommendations for the installation of cables are given in Annex B. Annex C lists the information that should be given with an enquiry or order.

BS 6724:1997+A3:2008 Referenced Document

• BS EN 10244-2 Steel wire and wire products — Non - ferrous metallic coatings on steel wire Part 2 : Zinc or zinc alloy coatings
• BS EN 50266-2-4 Common test methods for cables under fire conditions — Test for vertical flame spread of vertically - mounted bunched wires or cables — Part 2 - 4 : Procedures — Category C
• BS EN 50267-2-1 Common test methods for cables under fire conditions - Tests on gases evolved during combustion of materials from cables - Procedures - Determination of the amount of halogen acid gas - Determination of the amount of halogen acid gas*， 1999-09-15 Update
• BS EN 50363-5 Insulating, sheathing and covering materials for low voltage energy cables. Halogen-free, cross-linked insulating compounds*， 2006-01-16 Update
• BS EN 60228 
• BS EN 60332 Tests on electric and optical fibre cables under fire conditions. Test for vertical flame spread of vertically-mounted bunched wires or cables. Category D*， 2010-01-31 Update
• BS EN 61034-2 Measurement of smoke density of cables burning under defined conditions - Test procedure and requirements*， 2020-03-31 Update
• BS EN 62230 Electric cables. Spark-test method*， 2007-09-28 Update

BS 6724:1997+A3:2008 history

• 0000 BS 6724:2016(2017)
• 2016 BS 6724:2016 Electric cables. Thermosetting insulated, armoured cables of rated voltages of 600/1 000 V and 1 900/3 300 V for fixed installations, having low emission of smoke and corrosive gases when affected by fire. Specification
• 1997 BS 6724:1997+A3:2008 Electric cables — Thermosetting insulated, armoured cables for voltages of 600/1 000 V and 1 900/3 300 V, having low emission of smoke and corrosive gases when affected by fire
• 1997 BS 6724:1997 Electric cables - Thermosetting insulated, armoured cables for voltages of 600/1000 V and 1900/3300 V, having low emission of smoke and corrosive gases when affected by fire