How to Ensure Compliance with Noise Exposure Limits?

somashekar

Staff member
Super Moderator
#11
So my interpretation is close to what the rule says provided the degree of attenuation offered by the ear protectors is correctly measured or ensured. This is indeed a tough task to handle since NRR keeps decreasing with continued use of hearing aids and there's no way to measure there efficiency at site. So the best deal is to keep a wider safe margin.
Also considering the human behaviour and having consultation with the workers in question who are to be exposed to the noisy environment with the PPE (ear plugs)
So wider safety margins along with user acceptability for same.
Good luck.
 
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PotentCompoundSafety

#12
I've performed many noise monitoring projects and one thing to always keep in mind is the when they established these noise standards they realized that there would still be some hearing loss at those levels. This is because the economic cost to all businesses was fairly large to go from a 90 dBa standard to a 85 dB standard. Rather than totally relying on hearing protection devices, engineer control efforts should be made. Without hearing protection, here's the allowable limits:

90: 8 hours
95: 4 hours
100: 2 hours
105: 1 hour
110: 30 minutes
etc.

Many times if you get an octave band analyzer, you can identify the predominant frequency of the noise and select the most appropriate materials for attenuating the levels.
 
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