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You must comply with one of the following requirements when you repaint painted surfaces:
● Limit the total paint film thickness according to the explosion protection group:
– IIA, IIB: Total paint coating thickness ≤ 2 mm
– IIC: Overall coating thickness ≤ 0.2 mm for motors of group II (gas)
● Limit the surface resistance of the paint used:
– Surface resistance ≤ 1 GΩ for motors of groups II and III (gas and dust)
● Charge transfer limit
– 60 nC for Group I or Group IIA devices
– 25 nC for Group IIB devices
– 10 nC for Group IIC devices
– 200 nC for Group III devices (values not valid for strongly charge generating
● Breakdown voltage ≤ 4 kV for explosion group III (gas and dust)
Suitability test of the paint system for hazardous areas
Suitability certificates for the electrostatic suitability on explosion-protected machines are
available for paint systems ordered as standard. These certificates are not available for non-
standard or customized paint systems. Take into consideration that the provided evidence is
not valid for repaintings.
9.2
Corrective Maintenance
Observe the following when carrying out any work on the machine:
● Comply with the general safety instructions (Page 11)
● Comply with the applicable national and sector-specific regulations.
● When using the machine within the European Union, comply with the specifications laid
down in EN 50110-1 regarding safe operation of electrical equipment.
If the motor has to be transported, please observe the information and instructions in the
chapter "Transport (Page 32)".
9.2.1
Extended motor marking
The machine marking based on IEC / EN 60079–0 was supplemented by the "X" symbol.
● Maintain the special conditions for repairs. The gap dimensions for the electric machine
do not comply with the standardized values in IEC / EN 60079–1. For repair work, obtain
the gap dimensions of the electrical machine from the manufacturer.
● Perform maintenance, repair and modification work on explosion-protected machines in
strict compliance with the corresponding national health and safety legislation, the safety
instructions and descriptions in the general maintenance instructions.
1MB155 / 1MB555
Operating Instructions, 03/2018, A5E41926185A
processes)
Maintenance
9.2 Corrective Maintenance
119
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