1100 Volts Three & Half Core Armoured Cables
(Aluminium Conductor) Type 'AYFY'  to IS:1554(I) - 1988
        Normal Cross-Sectional Area of Conductor in mm2            
      Main 25 35 50 70 95 120 150 185 240 300 400 500 630
No. Description Unit  Neutral 16 16 25 35 50 70 70 95 120 150 185 240 300
  CONSTRUCTION DETAILS                              
  Conductor                              
1 Minimum number of wires                              
  a) Main conductor nos.   6 6 6 12 15 15 15 30 30 30 53 53 53
  b) Neutral Conductor nos.   6 6 6 6 6 12 12 15 15 15 30 30 30
2 Shape      
  a) Main conductor                   Shaped stranded          
  b) Neutral Conductor     Circulated              Shaped Stranded        
        Compacted                      
  Insulation      
3 Type                   PVC Compound Type A to IS:5831          
4 Nominal thickness       
  a) Main Core mm   1.2 1.2 1.4 1.4 1.6 1.6 1.8 2.0 2.2 2.4 2.6 3.0 3.4
  b) Neutral Core mm   1.0 1.0 1.2 1.2 1.4 1.4 1.4 1.6 1.6 1.8 2.0 2.2 2.4
5 Colour Scheme for identification      Red, Yellow, Blue FOR Main Cores and Black for Neutral Core  
  Inner Sheath                               
6 Type                    Extruded          
7 Material                   PVC Tapes          
8 Minimum Thickness     0.3 0.3 0.3 0.4 0.4 0.5 0.5 0.5 0.6 0.6 0.7 0.7 0.7
  Armouring      
9 Type & Material                   Single Layer of Flat Galvanised Steel Strips          
10 Nominal Thickness of strips                   0.8          
  Outer Sheath      
11 Type                   PVC Compound Type ST 1 to IS:5831          
12 Colour     Black  
13 Minimum Thickness mm   1.4 1.4 1.56 1.56 1.56 1.72 1.88 2.04 2.2 2.36 2.68 2.84 3.0
14 Dia over Laidup core  mm   16.93 18.94 22.74 27.28 31.57 34.51 38.58 42.80 48.33 53.71 59.21    
15 Dia over Inner Sheath mm   17.93 19.94 23.74 28.48 32.77 35.91 39.98 44.40 49.93 55.71 61.21    
16 Dia over Armoured (Strip) mm   19.53 21.54 25.34 30.08 34.37 37.51 41.58 46.0 51.53 57.31 62.81    
  Dia over Armoured (Wire) mm   21.13 23.14 26.94 32.48 36.77 39.91 43.98 49.40 54.93 62.01 67.51    
17
Approximate overall diameter of cable (Strip) mm   22.53 24.54 28.66 33.40 37.69 41.21 45.58 50.30 56.13 62.23 68.41    
  Approximate overall diameter of cable (Wire) mm   24.13 26.14 30.26 35.80 40.47 43.91 47.98 53.70 59.93 67.31 73.31    
  ELECTRICAL CHARACTERISTICS      
18 Resistance of conductor per 1000m length of completed cables                              
  a) Maximum d.c. resistance at 20 Deg C main conductor ohm   1.200 0.868 0.641 0.443 0.320 0.253 0.206 0.164 0.125 0.100 0.0778 0.0605 0.469
  b) Maximum d.c. resistance at 20 Deg. C Neutral conductor ohm   1.910 1.910 1.200 0.868 0.641 0.443 0.443 0.320 0.253 0.206 0.164 0.125 0.100
  c) a.c. resistance at 70 Deg C for main cond ohm   1.440 1.042 0.770 0.532 0.385 0.304 0.248 0.198 0.152 0.122 0.0962 0.0762 0.0608
19 Continuous current rating (a.c.) of cables under stranded conditions      
  i) When laid direct in ground amps   76 92 110 135 165 185 210 235 275 305 335 360 400
  ii) When laid in ducts amps   63 77 95 115 140 155 175 200 235 260 290 305 340
  iii)When laid in air amps   70 86 105 130 155 180 205 240 280 315 375 410 470
20 Reactance per 1000m length of cable at 50 Hz     0.054 0.050 0.050 0.046 0.043 0.042 0.042 0.042 0.041 0.040 0.040 0.040 0.040
21 Star Capacitance per 1000 m length of cable Micro   0.80 0.90 0.91 1.03 1.064 1.16 1.16 1.18 1.22 1.25 1.30 1.30 1.30
    farad                            
22 Minimum volume resistivity of Insulation Ohmcm                 1 X 10 13 AT 27 Deg C and 1 x 10 10 at 70 Deg C          
23 Maximum permissible shortcircuit Current for duration of one second kilo amps   1.900 2.660 3.800 5.320 7.220 9.120 11.400 14.060 18.240 22.800 30.400 38.00 47.880
24 Voltage drop per 1000m length of cable (assuming cbl 3 phase a.c. systems)      
  a) When laid direct in ground volts   190 166 147 125 112 99 91 81 76 69 60 54 51
  b) When laid in ducts volts   157 139 127 106 95 83 76 69 65 59 52 45 43
  c) When laid in air volts   175 155 140 120 105 97 89 81 78 71 68 61 59
  GENERAL :      
25 Approximate net weight per 1000 m length of finished cable (Strip) kg   924 1078 1403 1787 2225 2667 3137 3895 4675 5690 6963    
  Approximate net weight per 1000 m length of finished cable (Wire) kg   1165 1340 1710 2375 2958 3457 3975 5187 6285 6940 9699    
26 Standard length of cable (Subject to a manufacturing tolerance +/-5%             500             250  
27 Drum Dimensions-                              
  a) Approximate overall height mm   1250 1250 1450 1550 1650 1650 1850 2265 2265 1850 2050 2265 2465
  b) Approximate outer width mm   855 855 855 910 1130 1130 1180 1420 1420 1180 1240 1350 1450
28 Approximate gross weight of drum kg   650 725 985 1170 1475 1715 2085 2895 3360 1940 2475 3135 3345
29 Minimum bending radius for laying of CBL                   12  x  Overall Diameter of Cable           
30 Recommended pulling force:      
  a) When conductor pulled by pulling eye N                 30 x Total Conductor Area in mm2          
  b) When cable pulled with stocking N             9 x D2 where D is the Overall Diameter of cable in mm