CURRENT RATINGS MORE THAN A CABLE

Transcription

1 CURRENT RTINGS Updated for the 17th Edition of the IEE Wiring Regulations MORE THN CBLE C O M P N Y EI CBLES, DURHM ROD, BIRTLEY, CO DURHM. DH3 2R Tel: +44 (0) Fax: +44 (0) info@aeicables.co.uk

2 CURRENT RTINGS Compiled from BS 7671: 2008 Requirements for Electrical Installations: IEE Wiring Regulations 17th Edition and ER Reports Part III and Part V The following cable ranges are covered in this publication: General wiring cables Flexible cables and cords XLPE armoured cables Mineral insulated cables Firetec fire performance cables Protec cables SFETY WRNING IN ORDER THT ELECTRIC CBLE IS SFE ND POSES NO RISK TO HELTH, IT SHOULD BE INSTLLED IN CCORDNCE WITH BS 7671 (IEE WIRING REGULTIONS, 17TH EDITION). Installation should only be carried out by suitably qualified and approved persons, in accordance with the IEE on site guide and the IEE guidance note material.

3 for 60ºC rubber and 90ºC rubber insulated flexible cables to BS 7919 C.S.. 1 two-core cable* or 2 single core cables touching and associated voltage 60ºC rubber insulated 90ºC rubber insulated # 1 three-core, four-core or five-core cable 1 two-core cable* or 2 single core cables touching 1 three-core, four-core or five-core cable d.c. or single phase a.c. d.c. or single phase a.c d 1.85a d 2.04a d 1.32a d 1.46a d 0.93a d 1.02a d 0.67a d 0.73a a a 0.57d d 0.43a d 0.46a a d 0.39a a d 0.33a a d 0.28a d d 0.25a d d 0.22a d 0.20a d 0.20a d d The tabulated current ratings are for cables in free air but may also be used for cables resting on a surface. 2 These ratings are not applicable to cables wound on reeling drums or covered over or coiled up. Refer to Table 4F2 Notes 2 & 3 of BS Where the conductor is to be protected by a semi-enclosed fuse to BS 3036, see item 5.1 of the preface to ppendix 4 of BS * Two-core only up to and including 25. Single-core ratings for 25 and above. Larger voltage will result if the cables are spaced. # Where a conductor operates at a temperature exceeding 70 C it shall be ascertained that the equipment connected to the conductor is suitable for the conductor operating temperature. (See BS 7671 Regulations ) For lternative mbient Temperatures 60 C rubber insulated cables mbient Temperature 25 C 30 C 35 C 40 C 45 C 50 C 55 C Correction Factor C rubber insulated cables mbient Temperature 35 C 40 C 45 C 50 C 55 C 60 C 65 C 70 C 75 C 80 C 85 C Correction Factor and associated voltage for thermoplastic (PVC) insulated and sheathed flat cable with BS 6004 operating temperature: 70ºC mbient temperature: 30ºC For installations required to comply with BS 7671 method 100 (above a plasterboard ceiling covered by thermal insulation not exceeding 100mm in thickness) method 101 (above a plasterboard ceiling covered by thermal insulation exceeding 100mm in thickness) method 102 (in a stud wall with thermal insulation with cable touching the inner surface wall) method 103 (in a stud wall with thermal insulation with cable not touching the inner surface wall) method C (clipped direct) method (enclosed in conduit in an insulated wall) Where the conductor is to be protected by a semi-enclosed fuse to BS 3036, see item 5.1 of the preface to ppendix 4 of BS 7671 For lternative mbient Temperatures mbient Temperature 25 C 30 C 35 C 40 C 45 C 50 C 55 C 60 C Correction Factor and associated voltage and mass supportable for flexible cords to BS 6500 C.S.. single phase a.c. three phase a.c. single phase a.c. three phase a.c. Maximum mass supportable by twin flexible cord (see reg & ) kg bove ratings are based on ambient of 30 C For adjustment to other ambients refer to Table 4H3 of BS 7671

4 and associated voltage for single core PVC insulated cables, non-armoured, with or without sheath BS 6004 operating temperature: 70ºC mbient temperature: 30ºC For installations required to comply with BS 7671 C.S.. method - enclosed in conduit in thermally insulating wall etc. 3 or 4 cables, method B - enclosed in conduit on a wall or in trunking etc. 3 or 4 cables, method C - clipped direct flat and touching 3 or 4 cables, three phase a.c. flat and touching or trefoil flat method F - in free air or on a perforated cable tray horizontal or vertical Touching Spaced by one diameter 3 cables, three phase a.c. flat 3 cables, three phase a.c. trefoil a a f 1.50t a a a f 1.10t a a f 0.82t a a a a a f 0.57t a a a f 0.43t a a a f 0.36t a f 0.30t a a a f 0.26t a a a f 0.22t a a f 0.19t a a f 0.175t a d 0.28a d f 0.16t d d 0.27a d 0.175a f 0.15t d 0.175a d 0.165a f 0.145t d 0.165a d 0.16a Where more precise calculations require the use of resistive and reactive components of cable impedance, reference should be made to Table 4D1B of BS Where the conductor is to be protected by a semi-enclosed fuse to BS 3036, see item 5.1 of the preface to ppendix 4 of BS The current capacities in columns 2 & 4 are also applicable to flexible cables to BS 6004 Table 1 (c) where the cables are used in fixed installations. 3 Spacings larger than those specified in Method C (Table 4) will result in a larger voltage f 0.14t d 0.16a For mbient Temperature Horiz Vert mbient Temperature 25 C 30 C 35 C 40 C 45 C 50 C 55 C 60 C 65 C Correction Factor cables, or 3 cables flat Single phase Three phase 0.28

5 and associated voltage for twin and multicore XLPE insulated cables, non-armoured BS 7211 operating temperature: 90ºC mbient temperature: 30ºC For installations required to comply with BS 7671 method of Table 4E2 (enclosed in conduit in thermally insulating wall etc.) method B of Table 4E2 ( Enclosed ) method C of Table 4E2 ( ) method F of Table 4E1 (in free air) C.S Where more precise calculations require the use of resistive and reactive components of cable impedance, reference should be made to Table 4E2B of BS Where the conductor is to be protected by a semi-enclosed fuse to BS 3036, see item 5.1 of the preface to ppendix 4 of BS 7671 For mbient Temperature mbient Temperature 25 C 30 C 35 C 40 C 45 C 50 C 55 C 60 C 65 C 70 C 75 C 80 C Correction Factor Where a conductor operates at a temperature exceeding 70 C it shall be ascertained that the equipment connected to the conductor is suitable for the conductor operating temperature. (See Regulation of BS 7671).

6 and associated voltage for single core XLPE insulated cables, non-armoured, with or without sheath BS 7211 BS 7889 operating temperature: 90ºC mbient temperature: 30ºC For installations required to comply with BS 7671 C.S.. method of Table 4E1 - enclosed in conduit in thermally insulating wall etc. 3 or 4 cables, method B of Table 4E1 - enclosed in conduit on a wall or in trunking etc. 3 or 4 cables, method C of Table 4E1 - clipped direct flat and touching 3 or 4 cables, three phase a.c. flat and touching or trefoil Ref. method F of Table 4E1 (in free air or on a perforated cable tray) method G of Table 4E1 (in free air) Touching Spaced by one diameter flat 3 cables, three phase a.c. flat 3 cables, three phase a.c. trefoil f 1.60t a f 1.15t d 1.05a d 1.05a d f 0.87t d d d 0.75a d 0.75a d 0.71a f 0.61t d 0.71a d 0.73a a a f 0.45t a a a a f 0.37t a a d 0.43a d 0.43a d 0.36a f 0.31t d 0.36a d a a a f 0.26t a a a a a f 0.22t a f 0.195t f t d 0.28a d 0.28a f 0.160t d 0.27a d 0.27a Where more precise calculations require the use of resistive and reactive components of cable impedance, reference should be made to Table 4E1B of BS Where the conductor is to be protected by a semi-enclosed fuse to BS 3036, see item 5.1 of the preface to ppendix 4 of BS The current capacities in columns 2 & 4 are also applicable to flexible cables to BS 7211 Table 3 (b) where the cables are used in fixed installations. 3 Spacing larger than those specified in Method C (Table 4) will result in a larger voltage. 4 Where these cables are installed in rigid PVC conduit, the current capacities for PVC insulated cables to Table 4D1 of BS 7671 should be used f 0.15t f 0.145t f 0.140t 1520 Horiz Vert For mbient Temperature 2 cables, or 3 cables flat Single phase mbient Temperature 25 C 30 C 35 C 40 C 45 C 50 C 55 C 60 C 65 C 70 C 75 C 80 C Correction Factor Where a conductor operates at a temperature exceeding 70 C it shall be ascertained that the equipment connected to the conductor is suitable for the conductor operating temperature. (See Regulation of BS 7671). Three phase

7 and associated voltage for Firetec Standard and Firetec Enhanced cables to BS 7629, Protec cables to BS lso twin and multicore PVC insulated cables, nonarmoured BS 6004 BS 7629 BS 6004 BS operating temperature: 70ºC mbient temperature: 30ºC For installations required to comply with BS 7671 method of Table 4D2 (enclosed in conduit in thermally insulating wall etc.) method B of Table 4D2 ( Enclosed ) method C of Table 4D2 ( ) method E of Table 4D2 (Free air) C.S a a a a a a a a a a a a a a a a d d d Where more precise calculations require the use of resistive and reactive components of cable impedance, reference should be made to Table 4D2B of BS Where the conductor is to be protected by a semi-enclosed fuse to BS 3036, see item 5.1 of the preface to ppendix 4 of BS Cables to BS 7629 are rated for a conductor operating temperature of 70 C and are therefore included in this table, although the material used for the cable insulation is not PVC For mbient Temperature mbient Temperature 25 C 30 C 35 C 40 C 45 C 50 C 55 C 60 C Correction Factor

8 and associated voltage for twin and multicore armoured XLPE insulated cables BS 5467 BS 6724 operating temperature: 90ºC mbient temperature: 30ºC air / 20ºC ground for installations required to comply with BS 7671 C.S.. 1 two-core cable, method C of Table 4E4 ( ) method E of Table 4E4 (Free air) method D - direct in ground or in ducting in ground, in or around buildings 1 three or four-core cable, 1 two-core cable, 1 three or four-core cable, 1 two-core cable, 1 three or four-core cable, d Where more precise calculations require the use of resistive and reactive components of cable impedance, reference should be made to Table 4E4B of BS Where the conductor is to be protected by a semi-enclosed fuse to BS 3036, see item 5.1 of the preface to ppendix 4 of BS 7671 For mbient Temperature mbient Temperature 25 C 30 C 35 C 40 C 45 C 50 C 55 C 60 C 65 C 70 C 75 C 80 C Correction Factor Ground Temperature mbient Temperature 10 C 15 C 20 C 25 C 30 C 35 C 40 C 45 C 50 C 55 C 60 C 65 C 70 C 75 C 80 C Correction Factor Soil Resistivity Thermal resistivity K.m/W Rating factor for cables buried in ducts Rating factor for direct buried cables Where a conductor operates at a temperature exceeding 70 C it shall be ascertained that the equipment connected to the conductor is suitable for the conductor operating temperature (see Regulation of BS 7671).

9 and associated voltage for mineral insulated copper sheathed cables BS EN Part 1:2002 Sheath temperature: 70ºC mbient temperature: 30ºC For installations required to comply with BS 7671 Ratings Light Duty Cables (500 volt) C.S.. two-core cables three-core cables four-core cables seven-core cables method C method E method C method E method C method E method C method E LSZH LSZH LSZH LSZH LSZH LSZH LSZH LSZH Multicore Heavy Duty Cables (750 volt) C.S.. two-core cables three-core cables four-core cables seven-core cables method 1 method 11 method 1 method 11 method 1 method 11 method 1 method 11 LSZH LSZH LSZH LSZH LSZH LSZH LSZH LSZH core core Single Core Heavy Duty Cables (750 volt) method C method E, F & G free air, perforated tray etc. C.S.. Single phase a.c. or d.c. Three phase flat and touching Single phase a.c. or d.c. Three phase flat and touching Single phase a.c. or d.c. Three phase a.c ssociated Drop C.S.. Single phase Three phase Note: 1 ratings and volts values are for single phase operation, for three and four core cables: values are for three phase operation. They are based on Tables 4G1 and 4G1B of the 17th edition of the IEE Wiring Regulations (BS 7671), Method C (Clipped Direct) and Method E (Cable installed on a perforated cable tray) as indicated. Size of fuse element composed of tinned copper wire for use in semi-enclosed fuses Nominal current of fuse element Nominal diameter of wire mm Spacing of supports for cables in accessible positions Overall diameter of cable* Maximum spacing of clips Non-armoured rubber, PVC or lead sheated cables rmoured Cables Horizontal Vertical Horizontal Vertical mm mm mm mm mm Not exceeding Exceeding 9 and not exceeding Exceeding 15 and not exceeding Exceeding 20 and not exceeding *Taken as the measurement of the major axis, in the case of flat cables. The spacings stated for the horizontal runs may be applied also to runs at an angle of more than 30 from the vertical. For runs at an angle of 30 or less from the vertical, the vertical spacings are applicable. For the spacing of supports for cables of overall diameter exceeding 40mm and for single core cables having conductors of nominal area 300mm2 and larger, the manufacturer s recommendations should be observed. For a number of reasons, for instance as a result of improvements in design, in methods of manufacture or experience in the use or as permitted by the relevant British Standards specification, the products as supplied at any one time may differ from the descriptions given in this publication.

10 NOTES

11 For technical data sheets and free cable sizing wizard visit EI CBLES, DURHM ROD, BIRTLEY, CO DURHM. DH3 2R ll UK enquiries: Tel: +44 (0) Fax: +44 (0) ll International enquiries: Tel: +44 (0) Fax: +44 (0) EI Cables manufacturing site has full ISO9001 Quality System approval by LPCB and BSEC