Ground Wires for Transmission Lines – Commonly used size

Galvanised Steel Wires

 

Description Unit 7 / 3.15 7 / 3.66 7 / 4.06
1 Nominal Area sq.mm 55 75 90
2 Sectional Area
AAAC
Steel
Total		 –
sq.mm
sq.mm
sq.mm		 –
–
54.55
54.55		 –
–
73.65
73.65		 –
–
90.62
90.62
3 Overall Diameter mm 9.45 10.98 12.18
4 Approx. Mass kg/km 428 575 706
5 Rated Strength KN
kgf		 56
5710		 79.77
8134		 980.16
10010
6 Modulus of Elasticity kg/sq.cm 1.933 x 10^6 1.933 x 10^6 1.933 x 10^6
7 Coefficient of Uner Expansion Per deg.C 11.5 x 10^6 11.5 x 10^6 11.5 x 10^6
8 Electrical Resistance at 200 C Ohms/km 3.375 2.500 2.0318
9 Tension / Sag
Span (m) Temp (°C)		 T (Kgf) S (m) T (Kgf) S (m) T (Kgf) S (m)
260 32
53		 1142
1007		 3.17
3.59		 1627
1430		 2.99
3.40		 2002
1760		 2.98
3.39
275 32
53		 1142
1013		 3.54
3.99		 1627
1439		 3.34
3.78		 2002
1770		 3.33
3.77
320 32
53		 1142
1031		 4.80
5.31		 1627
1463		 4.52
5.03		 2002
1800		 4.51
5.02
350 32
53		 1142
1041		 5.74
6.30		 1627
1477		 5.41
5.96		 2002
1817		 5.40
5.95
380 32
53		 1142
1050		 6.76
7.36		 1627
1490		 6.38
6.97		 2002
1833		 6.37
6.95
400 32
53		 1142
1056		 7.50
8.11		 1627
1497		 7.07
7.68		 2002
1842		 7.05
7.67