LAYING OF 33KV/LT



 LAYING OF 33KV/LT UNDER GROUND CABLES: 

1

Laying of 11 KV/LT cable shall be done in a trench

2

Location of trench shall be in the foot path along the road.

3

The minimum size of trench for laying of any cable shall be as follows:

 

i) LT - 0.7 mts depth x 0.45 mts width

 

ii) 11 KV - 0.9 mts depth x 0.45 mts width

 

iii) 33 KV - 1.1 mts depth x 0.45 mts width

 

Note : Depth is from ground surface to the top the cable

4

The bottom of the trench shall be carefully leveled and kept free from stones.

5

Cables shall be laid in ground on a 50mm sand bed and covered on top and sides with sand & earth

6

Protective shaded stones/RCC slabs painted with APCPDCL shall be placed over the sand on cables and filed with borrowed earth to the level.

7

Current Rating of 11 KV XLPE , UG Cables.

 

S. No Size in Sq.mm Over dia in mm Current Rating AMPS in Ground
1 3 x 35 47 93 100
2 3 x 95 58 190 220
3 3 x 120 63 215 255
4 3 x 185 70 270 330
5 3 x 300 81 355 440
6 3 x 500 97 455 590

 

  Kgs/km Mts/Kg
34 Sq. mm AAA Conductor 92.94 10.6 - 10.9
55 Sq. mm AAA Conductor 147 - 149 6.7 - 6.8
100 Sq. mm AAA Conductor 270 - 273 3.6 - 3.7

 

  Weight of (6mtrs 20ft) length piece Kgs/mtr
M.S. Flat 50 x 6 mm 13 - 16 2.2 - 2.7
M.S. Flat 75 x 8 mm 25 - 30 4.2 - 5.0
M.S. Angle 50 x 50 x 6 mm 25 - 27 4.2 - 4.5
M.S. Angle 65 x 65 x 6 mm 33 - 36 5.5 - 5.0
M.S. Channel 75 x 40 mm 43 - 46 7.1 - 7.6
M.S. Channel 100 x 50 mm 58 - 62 9.6 - 10.3

 

R.S. JOISTS
175 x 85 mm    
10 mtrs length 196 - 205 kgs  
11 mtrs length 214 - 223 kgs (20 kgs/mtr approximately)
12 mtrs length 237 - 243 kgs  
150 x150 mm    
8 mtrs length 290 - 300 kgs  
10.5 mtrs length 360 - 380 kgs (36 kgs/mtr approximately)

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