Guideline Notes - Design Criteria

In order for easy reference and application, a set of design tables based on our range of standard products was developed. The design criteria used is based on standard practices used in SA.

Table 1: OHS ACT - Clearance profiles

Maximum voltage for which insulation is designed - kV rms phase to phase Minimum safety clearance Minimum clearance in metres
    Above ground - outside townships Above ground - in townships Above roads - in townships, proclaimed roads - outside townships, roadways and tramways To communication lines or between power lines and cradles To buildings, poles and structures not forming part of power lines
1.1 or less   4.9 5.5 6.1 0.6 3.0
7.2 0.15 5.0 5.5 6.2 0.7 3.0
12 0.20 5.1 5.5 6.3 0.8 3.0
24 0.32 5.2 5.5 6.4 0.9 3.0
36 0.43 5.3 5.5 6.5 1.0 3.0
48 0.54 5.4 5.5 6.6 1.1 3.0
72 0.77 5.7 5.7 6.9 1.4 3.2
100 1.00 5.9 5.9 7.1 1.6 3.4
145 1.45 6.3 6.3 7.5 2.0 3.8
245 1.85 6.7 6.7 7.9 2.4 4.2
300 2.35 7.2 7.2 8.4 2.9 4.7
362 2.90 7.8 7.8 9.0 3.5 5.3
420 3.20 8.1 8.1 9.3 3.8 5.6
800 5.50 10.4 10.4 11.6 6.1 8.5

Table 2: Conductor data

Conductor type Material type Overall diameter (mm) Weight per m (kg/m) Ultimate tensile strangth (kN) Total strands
Fox ACSR 8.37 0.149 13.2 7
Mink ACSR 10.98 0.255 21.8 7
Hare ACSR 14.16 0.425 36.0 7
Wolf ACSR 18.13 0.726 69.2 37
Bear ACSR 23.45 1.213 111.1 37
7/3.35 Steel 10.23 0.496 67.9 7
7/4.0 Steel 12.24 0.712 96.8 7
19/2.65 Steel 13.55 0.849 114 19

ACSR: Aluminium conductor steel core

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Guideline Notes - Design Criteria