NOISE STANDARD IN THE WORKPLACE
What is the Allowable Levels of Exposure for Noise in Workplace?
Protection against the effects of noise exposure shall be provided when the sound levels exceed those shown in Table 2.3 when measured on the A scale of a standard sound level meter at slow response.
1. When the daily noise exposure is composed of two or more periods of noise exposure of different levels, their combined effect should be considered, rather than the individual effect of each. If the sum of the following fractions:
C(l)/T(l) + C(2)/T(2) C(n)/T(n) exceeds unity, then, the mixed exposure should be considered to exceed the limit value. Cn indicates the total time of exposure at a specified noise level, and Tn indicates the total time of exposure permitted at that level. Exposure to impulsive or impact noise should not exceed 140 dB peak sound pressure level.
When noise levels are determined by octave band analysis, the equivalent A-weighted sound level may be determined as follows.
When employees are subjected to sound exceeding those listed in Table 2.3, feasible administrative or engineering controls shall be utilized. If such controls fail to reduce sound levels within the levels of Table 2.3, personal protective equipment shall be provided and used to reduce sound levels within the levels of the table.
If the variations in noise level involve maxima at intervals of 1 second or less, it is to be considered continuous.
No comments:
Post a Comment