Siemens SIMOTICS XP 1MB5 SH400, Руководство по эксплуатации, Страница: 120 / 166

Suitability test of the paint system for hazardous areas
For the paint systems ordered as standard on explosion-protected machines, verification of the
electrostatic suitability is available.
Such verification is not available for paint systems that are non-standard or specifically
requested by customers. Take into consideration that the provided verification is not valid for
repainting/recoating.
● Use the tested, original paint when recoating or touching up.
● The operating company is responsible for carrying out an electrostatic test of the complete
system.
9.2.16 Repainting
When you recoat painted surfaces, you must strictly comply with one of the following
requirements relating to the complete system, original paint plus paint used for recoating:
● 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)
● Strictly limit the surface resistance of the paint system 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 strong charge generating processes)
● Breakdown voltage ≤ 4 kV for explosion group III (gas and dust)
WARNING
Explosion hazard caused by incorrect painting
The paint coat can become electrostatically charged if an excessively thick paint coat is
applied. Electrostatic discharge can then occur. There is a risk of explosion if potentially
explosive mixtures are also present at this moment.
This can result in death, serious injury or material damage.
Maintenance
9.2 Inspection and maintenance
1MB5 SH 400/450
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Operating Instructions, 05/2019, A5E45959221A