CEI EN 60034-9/A1:2008

This part of IEC 60034: – specifies test methods for the determination of sound power level of rotating electrical machines; – specifies maximum A-weighted sound power levels for factory acceptance testing of network-supplied, rotating electrical machines in accordance with lEC 60034-1, having methods of cooling according to lEC 60034-6 and degrees of protection according to lEC 60034-5, and having the following characteristics: standard design, either a.c. or d.c., without additional special electrical, mechanical, or acoustical modifications intended to reduce the sound power level; rated output from 1 kW (or kVA) up to and including 5 500 kW (or kVA); rated speed not greater than 3 750 min–1.