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The Control of Noise at Work Regulations (Northern Ireland) 2006
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2. If the work is such that the daily exposure consists of two or more periods with different sound levels, the daily personal noise exposure level (LEP,d ) for the combination of periods is ascertained using the formula:
where—
n is the number of individual periods in the working day;
Ti is the duration of period i
(LAeq,T)i is the equivalent continuous A-weighted sound pressure level that represents the sound the person is exposed to during period i; and
is equal to Te , the duration of the person’s working day, in seconds.
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