Powered Platforms

Chapter 296-870, WAC

Effective Date: 01/01/07

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WAC 296-870-500

Existing Installations

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IMPORTANT:

This section applies to permanent powered platforms installations that meet all of the following:

  • The installation was completed between August 27, 1971, and July 24, 1990.
  • There has been no major modification to the installation after July 30, 1990.
  • The working platforms use electric-powered, winding drum type hoisting mchines.

Note:

  • Platforms operated by other types of power and using other types of hoisting machines are allowed if they:

    - Have adequate protective devices for the type of power used

    and

    - Provide reasonable safety for persons using or exposed to the equipment

  • Other types of hoisting machines include, but aren't limited to, machines such as traction drum hoisting machines, air powered machines, hydraulic powered machines, and internal combustion machines.

Definition

Definition:

An existing installation is a permanent powered platform installation that:

- Was completed before July 23, 1990

and

- Has had no major modification done after July 23, 1990.

 

Your responsibility:

To make sure powered platform installations completed between August 27, 1971, and July 24, 1990, meet these building and equipment requirements

Design, construction and installation

Fall protection

Electrical

 

WAC 296-870-50005

Design, construction, and installation

You must

  • Make sure powered platforms designated as Type F meet all the requirements in Part II of ANSI A120.1-1970, American National Standard Safety Requirements for Powered Platforms for Exterior Building Maintenance.

Definition

Definition:

A Type F powered platform has both of the following characteristics:

- The working platform is suspended by at least 4 wire ropes and designed so that failure of any one rope won't substantially alter the normal position of the working platform.

- Only one layer of hoisting rope is permitted onthe winding drums.

 

You must

  • Make sure powered platforms designated as Type T meet all of the requirements in Part III of ANSI A120.1-1970, American National Standard Safety Requirements for Powered Platforms for Exterior Building Maintenance except for section 28, Safety belts and lifelines.

Definition

Definition:

A Type T powered platform has a working platform that's suspended by at least 2 wire ropes. The platform won't fall to the ground if a wire rope fails, but the working platform's normal position would be upset.

WAC 296-870-50010

Fall protection

You must

  • Make sure the fall protection system on both Type F and Type T powered platforms meet the requirements of Appendix C-Personal fall arrest system, WAC 296-24-88050, found in the General Safety and Health Standards, Chapter 296-24 WAC.
  • Make sure working platforms have permanent guardrails that meet all of the following requirements:

    - Guardrails on the building side (front) of the platform have a top rail that isn't less than 38 inches and not more than 45 inches high.

    - Guardrails on the other three sides have a top rail that isn't less than 45 inches high.

    - Top rails are able to withstand a force of at least 200 pounds.

    - Guardrails have a midrail around the entire platform between the top rail and the toeboard.

Reference:

Ramps and walkways that are 4 feet (1.2m) or more above a lowere level need to have a guardrail system. These requirements are found in Working Surfaces, Guarding Floors and Wall Openings, Ladders, Part J-1, in the General Safety and Health Standards, Chapter 296-24 WAC.

 

 

WAC 296-870-50015

Electrical

You must

  • Make sure electrical wiring and equipment meet the requirements of the National Electric Code, NFPA 70-1987, ANSI C1-1987, except as modified by ANSI A120.1-1970, American National Standard Safety Requirements for Powered Platforms for Exterior Building Maintenance.
  • Make sure runway conductor systems are:

    - Designed for use in exterior locations

    and

    - Located to prevent contact with water or accumulated snow.

  • Make sure conductors, collectors, and disconnecting means meet the requirements for cranes and hoists in Article 610 of the National Electric Code, NFPA 70-1987, ANSI C1-1987.
  • Make sure the power conductors are paralleled by a ground conductor that meets both of the following:

    - It can't be opened by the disconnecting means

    and

    - The system is designed to not pose a hazard to persons in the area.

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