- D3 A 380v 3 Phase 20kw Sewage Pump Runs At Power Factor Of 0 9 And Efficiency Of 0 93 It Is Connected To The Power Sou 1 (42.52 KiB) Viewed 61 times
Appendix 2 50 1.0 - 1 - - - - Table A5(1) Correction factors for ambient temperature Note: This table applies where the associated overcurrent protective device is intended to provide short circuit protection only. Except where the device is a semi-enclosed fuse to BS 3036 the table also applies where the device is intended to provide overload protection Operating Ambient temperature (C) Type of insulation tempera ture 25 30 35 40 45 50 55 65 70 75 80 85 90 95 Rubber (flexible 60°C 1.04 0.91 0.82 0.71 0.58 0.41 cables only) General purpose 70°C PVC 1.03 1.0 0.94 0.87 0.79 0.71 0.61 0.50 0.35 Paper 80°C 1.02 1.0 0.95 0.89 0.84 0.77 0.71 0.63 0.55 0.45 0.32 Rubber 85°C 1.02 1.0 0.95 0.90 0.85 0.80 0.74 0.67 0.60 0.52 0.43 0.30 Heat resisting 85°C/90°C 1.03 1.0 PVC 0.97 0.94 0.91 0.87 0.84 0.80 0.76 0.71 0.61 0.50 0.35 Thermosetting 90°C 1.02 ) 1.0 0.96 0.91 0.87 0.82 0.76 0.71 0.65 0.58 0.50 0.41 0.29 OULPE) 70'C sheath 1.03 1.0 0.93 0.85 0.77 0.67 0.57 0.45 0.31 Mineral 105C sheath 1.02 1.0 0.96 0.92 0.88 0.84 0.80 0.75 0.70 0.65 0.60 0.54 0.47 0.40 0.32 Note: Correction factors for flexible cords and for 85°C or 150°C rubber insulated flexible cables are given in the relevant table of current carrying capacity in BS 7671. These factors are applicable only to ratings in columns 2 to 5 of Table A6(1). 11 II - - 4 Table A5(3) Correction factors for groups of more than one circuit of single-core cables, or more than one multicore cable Correction Factor Reference Method of Installation (seet Appendix 7) Number of Circuits or Multicore Cables 2 3 5 6 7 8 9 10 12 14 16 18 20 Enclosed (Method 3 or 4) or bunched and clipped direct to a non-metalic 0.80 0.70 0.65 0.60 0.57 0.54 0.52 0.50 0.48 0.45 0.43 0.41 0.39 0.38 surface (Method 1) Single layer clipped to a Touching 0.85 0.79 0.75 0.73 0.72 0.72 0.71 0.70 non-metallic surface (Method 1) Spaced * 0.94 0.90 0.90 0.90 0.90 0.90 0.90 0.90 0.90 0.90 0.90 0.90 0.90 0.90 Single layer multicore on a perforated metal Touching 0.86 0.81 0.77 0.75 0.74 0.73 0.73 0.72 0.71 0.70 cable tray, vertical or horizontal (Method 11) Spaced ** 0.91 0.89 0.88 0.87 0.87 Single layer single-core on a perforated metal Horizontal 0.90 0.85 cable tray, touching (Method 11) Vertical 0.85 Single layer multcore touching on 0.86 0.82 0.80 0.79 0.78 0.78 0.78 0.77 ladder supports (Method 13) - - - - - - - - - - - -- - - - 1 - - - - - - - - -
Appendix 3 Multicore armoured XLPE insulated cables (COPPER CONDUCTORS) BS 5467 BS 6724 Ambient temperature: 30°C CURRENT CARRYING CAPACITY (Amperes): BS 7846 Conductor operating temperature: 90°C Reference Method E Conductor Cross Reference Method C in free air or on a perforated cable tray, etc. sectional area (clipped direct horizontal or vertical 1 two-core cable, I three or four-core cable, 1 two-core cable, I three or four-core cable, single-phase ac or de three-phase a.c. single-phase ac or de three-phase ac 2 5 4 1.5 4 6 10 16 25 35 50 70 95 120 150 185 240 300 400 A 27 36 19 62 85 110 146 180 219 279 338 392 A 23 31 12 53 73 94 124 154 187 238 289 335 386 441 520 А 29 39 52 66 90 115 152 188 228 291 354 110 472 539 636 732 847 A 25 33 H 56 78 99 131 162 197 251 301 353 406 163 546 628 728 451 515 607 698 787 599 673 Conductor operating temperature: 90°C VOLTAGE DROP (per ampere per metre): Conductor Cross-sectional Two-core area cable d.c. 1 2 Two-core cable single phase a.c. 3 Three-or four-core cable three phase ac 4 mm 1.5 25 + 6 10 16 mV 31 19 12 7.9 4.7 2.9 mV 31 19 12 7.9 4.7 2.9 mV 27 16 10 6.8 4.0 25 r Z 25 35 50 70 95 120 150 185 240 300 1.85 1.35 0.98 0.67 0.49 0.39 0.31 0.25 0.195 0.155 0.120 1.85 1.35 0.99 0.67 0.50 0.40 0.32 0.26 0.20 0.16 0.13 X 0.160 0.155 0.155 0.150 0.150 0.145 0.145 0.145 0.140 0.140 z 1.90 1.35 1.00 0.69 0.52 0.42 0.35 0.29 0.24 0.21 r 1.60 1.15 0.86 0.59 0.43 0.34 0.28 0.22 0.175 0.140 0.115 x 0.140 0.135 0.135 0.130 0.130 0.130 0.125 0.125 0.125 0,120 0.120 1.65 1.15 0.87 0.60 0.45 0.37 0.30 0.26 0.21 0.185 0.165 400 0.140 0.19
Appendix 4 Multicore Armoured and Non-armoured Cables (Copper Conductor) Conductor resistance at 50Hz single-phase or three phase a.c. Conductor cross-sectional area (mm) Conductor resistance for PVC and XLPE cable in milliohm per metre (m/m) PVC cable at max, conductor operating temperature of 70°C XLPE cable at max. conductor operating temperature of 90°C 1.5 2.5 14.5 9 5.5 15.5 9.5 6 4 3.65 2.2 6 10 16 25 35 50 70 95 120 150 185 240 300 400 1.4 0.875 0.625 0.465 0.315 0.235 0.19 0.15 0.125 0.095 0.0775 0.0575 3.95 2.35 1.45 0.925 0.675 0.495 0.335 0.25 0.2 0.16 0.13 0.1 0.08 0.065