S-2.1, r. 4 - Safety Code for the construction industry

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2.21.7. The wearing of hearing protectors is mandatory when
(1)  the noise level to which a worker is exposed exceeds the exposure limits according to an evaluation based on a measurement made in accordance with section 2.21.8 or using a Type I or Type II integrating sound level meter or a Type II dosimeter;
(2)  it is not possible to converse with another person in a normal speaking voice, in other words without raising one’s voice or shouting, at a distance of approximately 1 m or one arm’s-length from the other person, or if impulse noise is present.
The evaluation of noise using an integrating sound level meter or dosimeter must be performed by a person with the necessary knowledge acting in compliance with best practices. The person must be available throughout the working day. In addition, the integrating sound level meter or dosimeter must be correctly calibrated on site, before and after the measurement is made, in accordance with the manufacturer’s instructions for the instrument used.
O.C. 781-2021, s. 2.