1100 Volts Unarmoured Cables - 2.5 mm2 
 Type 'YY'  to IS:1554(I) - 1988
Sl.     NUMBER OF CORES                              
No. Description Unit  2 3 4 5 6 7 8 9 10 12 14 16 19 21 24 27 30 33 37 44 52 61
  Constructional Details      
  Conductor      
1 Materials                       PLAIN ANNEALED COPPER              
2 No of Wire nos.                     7/0.67              
3 Shape                        Stranded Circular              
  Insulation      
4 Type                       PVC Compound Type A to IS:5831                
5 Nominal thickness  mm 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 0.90 0.90 0.90 0.90 0.90 0.90 0.90 0.90 0.90
6 Colour Scheme for identification  TWO CORE  - Red, Black               THREE CORE - Red, Yellow, Blue    
  Inner Sheath  & Outer Sheath FOUR CORE - Red, Yellow, Blue, Black FOUR CORE - Red, Yellow, Blue, Black, Grey  
  (Applied in one operation) SIX CORE AND ABOVE - Two adjacent cores (I.e counting core & direction core) in each layer   
                 Shall be Blue & Yellow respectovely and remaining cores shall be Grey          
7 Type                      PVC Compound Type ST 1 to IS:5831                
8 Colour                       Black                
9 Minimum Thickness of inner sheath mm 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.4 0.4 0.4 0.4 0.4
  Nominal thickness of outer sheath mm 1.8 1.8 1.8 1.8 1.8 1.8 1.8 1.8 1.8 2.0 2.0 2.0 2.0 2.0 S 2.0 2.0 2.2 2.2 2.2 2.2 2.2
10 Dia over Laid up core mm 7.70 8.30 9.30 10.30 11.50 11.50 12.40 13.20 14.00 15.30 16.90 18.00 19.20 20.40 23.20 23.6 24.80 25.70 26.80 30.60 32.10 34.50
11 Dia over Inner Sheath mm 8.70 9.30 10.30 11.30 12.50 12.50 13.40 14.20 15.00 16.30 17.90 19.00 20.20 21.40 24.00 24.60 25.60 26.90 28.00 31.80 33.30 35.70
12
Approximate overall diameter of cable mm 14.20 14.80 15.80 16.80 18.00 18.00 19.20 19.00 19.80 21.10 22.70 23.80 25.00 26.20 28.80 29.40 30.80 31.90 33.00 36.80 38.30 40.70
  ELECTRICAL CHARACTERISTICS                                        
13 Resistance of conductor per                                         
  1000m length of completed cable        
  a) Maximum d.c. resistance at 20 Deg C ohm                     7.41              
  b) a.c. resistance at 70 Deg. C ohm                     8.866              
14 Continuous current rating (a.c.) of         
  cables under standard conditions                                        
  i) When laid direct in ground amps 32 27 27 23 21 20 19 18 18 17 16 15 14 13 13 12 12 11 11 10 10 9
  ii) When laid in ducts amps 27 24 24 19 18 17 16 15 15 14 13 13 12 11 11 10 10 9 9 9 8 8
  iii)When laid in air amps 27 24 24 19 18 17 16 15 15 14 13 13 12 11 11 10 10 9 9 9 8 8
15 Reactance per 1000m length of cable                       0.087              
  at 50 Hz ohm    
16 Capacitance between conductors per  Micro                     0.120              
  1000m length of cable farad                                    
17 Minimum volume resistivity of PVC Insu Ohmcm   1 X 10 13 AT 27 Deg C and 1 x 10 10 at 70 Deg C    
18 Maximum permissible shortcircuit  kilo                      0.288              
  current for duration of one second amps                                    
19 Voltage drop per 1000m length of         
  cable (assuming three phase a.c. systems)        
  a) When laid direct in ground volts 567 479 479 408 372 355     319 301 284 266 248   231 213 213   195 177 177 160
  b) When laid in ducts volts 479 426 426 337 319 301     266 248 231 231 213   195 177 177   160 160 142 142
  c) When laid in air volts 479 426 426 337 319 301     266 248 231 231 213   195 177 177   160 160 142 142
  GENERAL :      
20 Approximate net weight per                                         
  1000m length of finished cable kg 186 228 273 320 367 397 442 486 529 633 721 804 922 1007 1142 1253 1366 1501 1686 1980 2207 2621
21 Standard length of cable (Subject to a                                      
  manufacturing tolerance +/-5%) m                     500              
22 Drum Dimensions-                                        
  a) Approximate overall height mm 840 840 840 940 940 940     1140 1140 1140 1250 1250   1450 1450 1450   1450 1650 1650 1650
  b) Approximate outer width mm 515 515 665 690 690 690     715 715 715 855 855   855 855 855   855 1130 1130 1130
23 Approximate gross weight of drum kg 155 170 200 220 270 280     395 440 480 555 615   785 840 900   1060 1350 1500 1675
24 Minimum bending radius for laying of CBL                       12  x  Overall Diameter of Cable                 
25 Recommended pulling force:                                        
  a) When conductor pulled by pulling eye N                     50 x Total Conductor Area in mm2                
  b) When cable pulled with stocking N                     5 x D2 where D is the Overall Diameter of cable in mm                
STRANDED CONDUCTOR IS ALSO PERMISSIBLE IN THESE SIZES