OHS Code Explanation Guide

Published Date: July 01, 2009
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Part 40 Utility Workers – Electrical

Explanation of Rules Referenced from the ECUC, Second Edition

Rule 4-148 Barehand techniques

This rule specifies clearance distances that must be maintained when a qualified utility employee performs barehand work. The distances are shown in Table 4-4 and Table 4-2.

Table 4-4 Limit of Approach Distances in Millimetres for Qualified Utility Employees Performing Live Line Work Using Barehand Techniques (See Rule 4-148)

Voltage Levels

Qualified utility employees

Nominal voltage
to ground
 

 
kV

Nominal voltage
phase to phase
 
 
 
kV

Maximum
operating
voltage phase
to phase

kV

Limit of approach for work
performed from a rated insulated
device or from an energized phase
conductor

Energized body
parts to
exposed
structure
surfaces or
grounded parts

Mm

Energized body
parts to exposed
adjacent phases
 
 
 
 
mm

Column 1

Column 2

Column 3

Column 4(1)

Column 5(2)

2.4

4.16

4.58

(3)

(3)

8

13.8

15.18

(3)

(3)

14.4

25

27.5

(3)

(3)

19.9

34.5

37.95

(3)

(3)

 

69, 72

79.2

610

1060

 

138, 144

158.4

920

1590

 

230, 260

285

1410

3050

 

500

550

2710

6650

Note:
(1) Limit of approach distances in Column 4 have been calculated using IEEE minimum tool distances rounded to the nearest 10 mm.
(2) Limit of approach distances in Column 5 have been calculated using IEEE minimum tool distances formula applied to phase-to-phase voltage, rounded to the nearest 10 mm.
(3) Live line work using barehand techniques is not normally done at these voltage levels. Barehand techniques may be used with other work techniques on lines operating at these voltage levels.

Table 4-2 Limit of Approach Distances in Millimetres for Qualified Utility Employees (See Rules 4-136 & 4-148)

Voltage Levels

Qualified Utility
Employees

Nominal voltage to
ground
 
kV

Nominal voltage
phase
to phase
kV

Maximum operating
voltage phase to
phase
kV

Limit of approach
to exposed
energized
parts mm

Column 1

Column 2

Column 3

Column 4(1)

0.6 (DC only)

 

 

500

2.4

4.16

4.58

500

8.0

13.8

15.18

550

14.4

25

27.5

650

19.9

34.5

37.95

750

 

69, 72

79.2

1050

 

138, 144

158.4

1350

 

230, 260

285

1850

 

500

550

3150

Note:
(1) Limit of approach distances in Column 4 have been calculated using IEEE minimum tool distances plus 450 mm safety factor, rounded to the nearest 50 mm.