Signalling on low-voltage electrical installations in the frequency range 3 kHz to 148,5 kHz. Part 2-2. Immunity requirements for mains communications equipment and systems operating in the range of frequencies 95 kHz to 148,5 kHz and intended for use in industrial environments
Occupational safety standards system. Personal protective means of hear body. Estimation of effective A-weighted sound pressure levels when hearing protectors are worn