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OSHA Hazard Information Bulletins
Insulated and Non-Insulated Aerial Devices


February 22, 1990

MEMORANDUM FOR:

REGIONAL ADMINISTRATORS

THRU:

  • LEO CAREY
  • Director
  • Office of Field Programs

FROM:

  • THOMAS J. SHEPICH
  • Director
  • Directorate of Technical Support

SUBJECT:

  • Hazard Information Bulletin - Insulated and Non-Insulated Aerial Devices

The Directorate of Technical Support issues Hazard Information Bulletins (HIB) in accordance with OSHA Instruction CPL 2.65 to provide relevant information regarding unrecognized or misunderstood safety and health hazards, inadequacies of materials, devices, techniques, and engineering controls. HIB's are initiated based on information provided by the field staff, studies, reports and concerns expressed by safety and health professionals, employers, and the public. Information is compiled based on a comprehensive evaluation of available facts, literature and in coordination with appropriate parties. HIB's do not necessarily reflect OSHA policy.

The Dallas Regional Office brought to our attention a potential serious safety hazard with the use of aerial devices. An electrician was electrocuted while working on electric signs, standing in a fiberglass bucket mounted on an aerial ladder. The fiberglass bucket has a metal reinforcing strip on the upper lip of the bucket which is isolated from all other metal parts. It appears that the metal strip played a part in the accident.

Upon reviewing the aerial ladder specifications and the information from the manufacturer and distributor, we determined that the aerial ladder in question was a non-insulated unit. According to the manufacturer of the aerial ladder, warning labels are affixed on this model of aerial ladder stating that the unit is a non-insulated device. This is required by the revised ANSI A92.2-1979 standard.

For an aerial device to be acceptable for use on energized equipment as an insulated device up to 69kV, it must meet the following requirements of ANSI A92.2-1969 standard:

3.2 Electrical Ratings

3.2.1 Required Statement

3.2.2 Rated Line Voltage

3.2.3 Certification

4.10 Insulated Boom and Platform Specifications, and

5.4 Insulation Tests

Compliance and consultation personnel should be aware of the requirements of insulated and non-insulated aerial devices.

Please distribute this bulletin to Area Offices, State Plan States, and Consultation Project Officers.

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