Safety Standards for Window Cleaning

Chapter 296-878, WAC

Effective Date: 01/01/03

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Power line clearances

WAC 296-878-170
For printing

WAC 296-878-17005

Maintain clearance between window cleaners and power lines.

You must

  • Maintain clearances between window cleaners and power lines as indicated in Tables 2 and 3.

Table 2
Minimum Clearances from Power Lines - Insulated Lines

 

Voltage

Minimum distance

Alternatives

Less than 300 volts

3 feet (0.9 m)

--

300 volts to 50 kv

10 feet (3.1 m)

--

More than 50 kv

10 feet (3.1 m) plus 0.4 inches (1.0 cm) for each 1 kv over 50 kv

2 times the length of the line insulator, but never less than 10 feet (3.1 m)


Table 3
Minimum Clearances from Power Lines - Uninsulated Lines

 

Voltage

Minimum distance

Alternatives

Less than 50 kv

10 feet (3.1 m)

--

More than 50 kv

10 feet (3.1 m) plus 0.4 inches (1.0 cm) for each 1 kv over 50 kv

2 times the length of the line insulator, but never less than 10 feet (3.1 m)

You must

  • Follow these procedures when window cleaners need to get closer to power lines than allowed in Tables 2 and 3:
    • - Notify the utility company or electrical system operator of the need to work closer than the minimum clearances to power lines before starting the work
    • - Begin the work only when the utility company or electrical system operator has deenergized or relocated the lines, or installed protective coverings to prevent accidental contact with the lines.

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