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 4-226 Climbing tree distance

Utility tree trimmers, utility tree workers or other workers are prohibited from cutting or climbing any tree, or portion of a tree, that is closer to energized electrical equipment or lines that the distances specified in Table 4-6. “Other” workers are considered to be individuals working under the direct supervision of a tree trimmer or tree worker i.e. and entry-level position within the utility tree work industry.

This prohibition does not apply to utility tree trimmers using rated insulated devices and following these safety rules. Utility tree trimmers have more extensive training than the other listed workers and when using rated insulated devices, can use the clearance distances specified in Table 4-7 (see rule 4-228).

Table 4-7 Tree to Energized Electrical Equipment or Lines Distances in Millimetres for Utility Tree Trimmers Using Rated Insulated Tools (See Rules 4-212, 4-214 & 4-228)

Voltage levels

Utility tree trimmers

Nominal voltage
to ground
 
 
 
 
 
kV

Nominal voltage
phase to phase
 
 
 
 
 
kV

Maximum
operating
voltage phase to
phase
 
 
 
kV

Tree to
energized
electrical
equipment or
lines distance
using rated
insulating tools
 
 
 
 
mm

Tree to
energized
electrical
equipment or
lines distance
using rated
insulating tools
from a rated
insulating aerial
device
 
mm

Column 1

Column 2

Column 3

Column 4(1)

Column 5(2)

0.6 (DC only)

 

 

350

not touching

2.4

4.16

4.58

350

not touching

8

13.8

15.18

400

not touching

14.4

25

27.5

500

not touching

19.9

34.5

37.95

600

not touching

 

69, 72

79.2

900

600

 

138, 144

158.4

1200

900

 

230, 260

285

1700

1400

 

500

550

3000

2700

Note:
(1) Tree to energized equipment or lines distances in Column 4 have been calculated using IEEE minimum tool distances plus 300 mm safety factor, rounded to the nearest 50 mm.
(2) Tree to energized electrical equipment or lines distances in Column 5 for 69 kV lines and higher have been calculated using IEEE minimum tool distance rounded to the nearest 50 mm.