TM 5-3810-302-10
The use of boom guards, proximity devices, insulated hooks, links, or mech-
anical limit stops does not assure safety. Even if codes or regulations require
the use of such devices, failure to follow rules listed here may result in serious
injury or death. You should be aware of some of the limitations of the
devices.
Boom Cage/Guards afford limited protection from electrocution hazards.
They are designed to cover only the boom-nose/point, and a portion of the
boom. Performance of boom cages/guards is Iimited by their physical lengths,
insulating characteristics, and the operating environment (e.g. dust, dirt,
moisture, etc.).
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