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A Performance Evaluation of Two Overhead Power Line Proximity Warning Devices (Paperback)
Loot Price: R352
Discovery Miles 3 520
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A Performance Evaluation of Two Overhead Power Line Proximity Warning Devices (Paperback)
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Loot Price R352
Discovery Miles 3 520
Expected to ship within 10 - 15 working days
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Many of the electrical fatalities in construction, mining, and
other industries are due to personnel accidentally contacting
overhead electrical power lines with high-reaching equipment such
as mobile cranes. During a recent 10-year period, approximately 20%
of occupational electrocutions involved contact between mobile
equipment and overhead power lines. In a typical power line contact
accident, the frame of the equipment (and possibly a suspended load
in the case of mobile cranes) is energized to a high voltage
relative to the surrounding ground surface. Anyone touching the
frame and ground simultaneously is exposed to this high voltage and
can become a path for lethal levels of electrical current. Overhead
electrical power line PWDs are mobile equipment-mounted safety
devices intended to alert personnel if the equipment is operating
too close to an energized overhead electrical power line. Such
devices have been commercially available for more than 30 years,
but have not found widespread acceptance in many industries due, in
part, to a lack of regulatory requirements for their use. The
Occupational Safety and Health Administration (OSHA) is currently
involved in updating the standards for cranes and derricks (29 CFR
1926.550). Part of the proposed revision addresses overhead power
line safety for mobile cranes and includes explicit reference to
PWDs as one of several acceptable measures for protecting workers
from accidental power line contacts. With this proposal to accept
PWDs as one means to maintain a safe distance between cranes and
power lines (as specified in 29 CFR), NIOSH researchers concluded
that an objective performance evaluation of PWDs would be valuable
and timely. A performance evaluation of two commercially available
overhead power line PWDs was conducted at NIOSH-PRL. The objective
of the tests was to document performance capabilities and
limitations for these PWDs by identifying factors that can
influence their operation. The overall approach for this testing
called for the two PWD companies to install their devices on a
government-owned 22-st (20-mt) rough terrain crane and specify
procedures for their use. The crane was to be operated using a wide
range of boom positions near several different configurations of
energized overhead power lines, with the performance of the PWDs
documented. This full-scale testing took place at a purpose-built
overhead power line test site at PRL. PRL engineers coordinated and
directed this research, but input for developing the test protocol
was solicited from a number of cooperators, including the two PWD
manufacturers participating in the study, an equipment
manufacturing trade association representative, labor union
representatives, OSHA, a large private construction and crane
rental firm with experience using PWDs, and an electrical
engineering consulting firm working as a NIOSH contractor.
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