The present study was performed on two groups of linemen from a Provincial energy distribution company. They are involved in the installation and maintenance of power lines on towers and poles. Their attenuation was measured using a FitCheck Solo field attenuation estimation system (FAES) before and after providing a one-to-one fitting instruction. Participants' external ear canal was also measured to examine how an eventual asymmetry between both ears could influence the measured PAR. Also, a questionnaire was completed by the participants. It contained questions on frequency of use of the protectors, confidence in their efficiency, overall comfort and ease of communication. Answers of the questions were correlated to results from the FAES tests. Results confirm that measured attenuation increase with one-to-one instructions. Increases are larger with reduced attenuations.
