Mitsubishi Melsec-Q Series User Manual page 213

(2) Dustproof and waterproof features
The control panel also has the dustproof and waterproof functions. Insufficient dustproof and waterproof features
lower the insulation withstand voltage, resulting in insulation destruction.
The insulation in our programmable controller is designed to cope with the pollution level 2, so use in an
environment with pollution level 2 or below.
Pollution level 1 : An environment where the air is dry and conductive dust does not exist.
Pollution level 2 : An environment where conductive dust
does not usually exist, but occasional temporary conductivity occurs due to the
accumulated dust. Generally, this is the level for inside the control box equivalent to IP54 in
a control room or on the floor of a typical factory.
Pollution level 3 : An environment where conductive dust exits and conductivity may be generated due to the
accumulated dust.
An environment for a typical factory floor.
Pollution level 4 : Continuous conductivity may occur due to rain, snow, etc. An outdoor environment.
As shown above, the programmable controller can realize the pollution level 2 when stored in a control panel
equivalent to IP54.
CHAPTER9 EMC AND LOW VOLTAGE DIRECTIVES
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