Electricmotor Explosion proof DEFINITION An explosion and flame proof motor EEx-d is a rotating machine which can work in an environment with the presence of gases and/ or explosive or infiammable fumes without causing internal damage to the motor. It is in fact: Explosion-proof: its housing neither cracks nor explodes in case of an inward short circuit. Flame-proof: it doesn’ t allow the exit of gases and flame from the motor when the ambient temperature is critical. Main characteristics - size 56 ÷ 225 - housing and shields in cast iron - mechanical protection IPW 557 - fan cover protection IP 2x - the motors are tropicalised - the cooling fan is in non-sparking synthetical material up to sizes 132, metallic upper sizes - alkilic paint RAL 5010 - screws: nickeled or cadmied - stainless steel nameplate - ball bearings type ZZ on both sides Voltage and frequency Motors can be wound up to 600 V 50 or 60 Hz. According to CEI standard the rated operating voltage can stand a variation of ± 5% .