Electrical Hazards and Utility Work Near Energized Lines
What this domain tests
This domain tests recognition of energized-line hazards, application of minimum approach distances, and the limits of insulating boom sections.
Core rules
- Treat all lines as energized until the utility confirms otherwise. Establish minimum approach distances (MAD) from the employer’s table and OSHA 1910.269 or 1926 Subpart V; include the boom, load, rigging, and tag lines.
- The fiberglass upper boom section is not a guarantee of protection. It must be clean, dry, undamaged, and tested per manufacturer and employer requirements.
- Use non-conductive tag lines and proper rubber gloves with sleeves where required. Ground or bond according to the employer’s procedures.
- Keep spotters and ground personnel outside the MAD. If contact occurs, stay in the cab if it is safe, warn others away, and call for help; do not touch the ground and the machine at the same time.
Worked example
A 12.47 kV line requires a MAD of 2 ft 2 in for the qualified employee. The load swings to within 1 ft. The correct action is to stop the movement, back the boom away, and reassess; the fiberglass section does not make 1 ft acceptable. The exam tests the distance rule, not confidence in the boom.
Traps
Relying on the insulating boom to permit contact; allowing a spotter inside the MAD; using wire rope or wet rope as a tag line near conductors; and assuming a line is de-energized because it “looks dead.”
Key points
- Treat all lines as energized until confirmed de-energized.
- Apply the employer’s MAD to boom, load, rigging, and tag lines.
- Fiberglass booms require cleanliness, dryness, and testing.
- Keep all personnel outside the MAD.
- On contact, stay in the cab if safe and warn others away.