Noise Emission Declaration
Section 188.8.131.52 (u) of the Machinery Directive 2006/42/EC describes that information on airborne noise emissions must be stated in the so-called noise emission declaration.
This declaration serves two purposes:
- It is intended to assist users in selecting machines with reduced noise emission
- to provide information useful for the risk assessment to be carried out by the user in accordance with the national regulations
The noise level at the workplace of a machine must be mentioned in the user manual if it exceeds 70 dB(A). The sound power must be determined and declared if the emission sound pressure level exceeds 80 dB(A).
The information to be provided in the noise emission declaration includes three different noise emission values:
- The A-weighted emission sound pressure level, LpA, produced by the machinery at its workstation(s).
This is the average A-weighted sound pressure level over a specific time, representative of a full work cycle of the machinery. Being an emission value, it excludes contributions from the environment of the machinery such as reflections of noise from walls or noise from other sources at the workplace.
- The peak C-weighted instantaneous sound pressure value
Also known as the Cweighted peak sound pressure level, LpCpeak. This is the maximum value reached by the C-weighted sound pressure over a specific duration representative of a full work cycle of the machine.
- The A-weighted sound power level, LWA.
This quantity represents the airborne sound energy radiated by the machine in space and thus characterises the machine as a noise source. It is the most important noise emission quantity and is independent of the environment in which the machine is placed.