Powered Platforms
Chapter 296-870, WAC
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Effective
Date: 01/01/07 |
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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.
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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.
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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.
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Your responsibility:
To make sure powered platform installations
completed between August 27, 1971, and July 24, 1990, meet these
building and equipment requirements
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.
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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.
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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.
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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.
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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.
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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