AL Tunnel Practice Questions - Alabama Tunnel Contractor Examination Exam

Under OSHA 1926.800, what communication is required when natural unassisted voice is ineffective underground?

Power-assisted voice communication between the face, shaft bottom, and surface; shafts used for personnel access or hoisting need two effective means, at least one of them voice Hand signals only, with no voice system allowed A single whistle at the portal that is never tested Cell phones only, with no backup if service is lost

Correct Answer:

Power-assisted voice communication between the face, shaft bottom, and surface; shafts used for personnel access or hoisting need two effective means, at least one of them voice

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