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S-2.1, r. 4 - Safety Code for the construction industry
Section 2.21.2
Disposition versions
2.21.2. The noise exposure limits are as follows:
(1) daily noise exposure level: 85 dBA, as defined using one of the following formulas:
(a) under ISO Standard 9612:2009, Acoustics – Determination of occupational noise exposure – Engineering method:
LEX,8h = LP,A,eqTe + 10 lg [Te/T0] dB,
where
Te = effective duration of the working day, in hours;
T0 = reference duration, 8 h;
(b) under CSA Standard Z107.56-13, 2014, Measurement of noise exposure:
Lex,8h = Leq,t + 10 log (TW/8),
where Tw = effective duration of the working day, in hours;
(2) peak sound pressure level (Lp,Cpeak): 140 dBC, using the following formula, provided for in ISO Standard 9612:2009, Acoustics – Determination of occupational noise exposure – Engineering method:
Lp,Cpeak = 10 lg[p2Cpeak/p20] dB,
where the reference value, p0, is 20 μPa.
