Art 70-80

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1. NOISE
Article 70 .- In the occupational exposure to noise was distinguishable noise
stable, fluctuating noise and impulse noise.
Article 71 .- steady noise is the noise that has fluctuations
the instantaneous sound pressure level less than or equal to 5 dB (A)
slow, during an observation period of 1 minute.
Fluctuating noise is the noise level fluctuations presented
instantaneous sound pressure in excess of 5 dB (A) slow during
an observation period of 1 minute.
Impulsive noise is the noise which has energy impulses
acoustic for less than 1 second at intervals of more than
1 second.
Article 72 .- The measurements of steady noise, fluctuating noise and noise
be made with an impulse integrating sound level meter or a
dosimeter meeting the requirements outlined for the types 0, 1
or 2, set the standard: IEC 651-1979, IEC 804-1985 and ANSI S.
1.4-1983.
2. Article 73 .- In noise exposure should be stable or fluctuating
measuring continuous sound pressure level equivalent (Leq NPSeq or)
which is expressed in decibels weighted 'A' with response
slow, ie, in dB (A) slow.
Article 74 .- Occupational exposure to steady noise or fluctuating
must be controlled so that for a day of 8 hours
Daily no worker may be exposed to a pressure level
equivalent continuous sound above 85 dB (A) slow, measured in
the employee's ear position.
Article 75 º .- Levels of equivalent continuous sound pressure,
different from 85 dB (A) slow, be permitted provided that the time
worker exposure to noise does not exceed the values shown
in the following table:

When
items of daily exposure to noise is composed
two or more periods of exposure to different pressure levels
equivalent continuous noise should be considered the effect
combination of those periods which are equal to or NPSeq
above 80 dB (A) slow. In this case the dose should be calculated
Daily Noise (D), using the following formula:






Te = Total time of exposure to a particular NPSeq
Tp = total time of exposure permitted at that NPSeq
The maximum daily noise dose allowable is 1 (100%)


Article 77 .- In no case will allow workers lacking
personal hearing protection exposed to pressure levels
equivalent continuous sound above 115 dB (A) slow, whatever
the type of work.
1.2 Impulsive Noise
Article 78 º .- The impulsive noise exposure must be measured in the
peak sound pressure level (SPL peak), expressed in decibels
weighted "C", ie, dB (C) Peak.
Article 79 º .- Occupational exposure to impulse noise should
be controlled so that for an 8 hour day
no worker may be exposed to a sound pressure level
peak above 95 dB (C) Peak, measured at the ear position
worker.
Article 80 º .- peak sound pressure levels different from 95 dB (C)
Peak, are permitted provided that the length of exposure to noise
worker shall not exceed the values shown in the following table:

Article 81 º .- In no case will allow workers lacking
personal hearing protection exposed to pressure levels
noise peak exceeding 140 dB (C) peak, regardless of the type of
work.
Article 82 º .- When a worker using hearing protection
personnel, shall be deemed to comply with the provisions of Articles
75th and 80th of this regulation if the actual sound pressure level
does not exceed the maximum permissible limits laid down in the
tables mentioned in those articles.
For purposes of this regulation shall mean pressure level
effective sound difference between the continuous sound pressure level
equivalent or peak sound pressure level, depending on whether the noise stable, fluctuating or impulsive respectively, and the reduction
Noise will grant the hearing protector. In both cases the
noise reduction will be calculated in accordance with official standards
force concerning hearing protection

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