Hearing protectors. Safety requirements and testing - Ear-muffs attached to an industrial safety helmet Ingestion-build-177197 pre-treatment of test pieces

pre-treatment of test pieces

Tolerances and mass

Cone section diameter tolerance (TDS)

complete chimney and all chimney components from the appliance connection to the discharge point into outside air

NICAM performance

Hearing protectors. Safety requirements and testing - Ear-muffs attached to an industrial safety helmet Ingestion-build-177197 pre-treatment of test piecesThe particular requirement in relation to the ability of hearing protectors to reduce noise below daily limit levels is addressed in the standard by requiring the sound attenuation of the hearing protectors, measured in accordance with EN 24869 1, to be not less than a specified minimum. Further, by requiring that the measured sound attenuation be declared, the selection of suitable hearing protectors for individual circumstances may be undertaken