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Maintaining Terminal Boxes - Siemens 1LA8 Operating Instructions Manual

Simotics tn series n-compact induction motor.
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● Limit the total paint coating thickness according to the explosion protection group:
● Limit the surface resistance of the paint used:
● Charge transfer limit
● Breakdown voltage ≤ 4 kV for explosion group III (dust only)
Suitability test of the paint system for hazardous areas
Proof is available for the electrostatic suitability with explosion-proof machines for the paint
systems ordered by default. Such evidence is not available for paint systems that are non-
standard or specifically requested by customers. Take into consideration that the provided
evidence is not valid for repaintings.
9.1.14

Maintaining terminal boxes

Requirement
The machine is de-energized.
Checking the terminal box
● Terminal boxes must be regularly checked for tightness, undamaged insulation, and tight
● If dust or humidity have infiltrated the terminal box, this should be cleaned and dried
SIMOTICS TN Series N-compact 1LA8
Operating Instructions 05/2014
– IIA, IIB: Total paint coating thickness ≤ 2 mm
– IIC: Overall coating thickness ≤ 0.2 mm for motors of group II (gas)
– Surface resistance ≤ 1 GΩ for motors of groups II and III (gas and dust)
– 60 nC for Group I or Group IIA devices
– 30 nC for Group IIB devices
– 10 nC for Group IIC devices
– 200 nC for Group III devices
terminal connections.
(particularly the insulators).
Check all the seals and sealing surfaces and address the cause of the leakiness.
Maintenance
9.1 Inspection and maintenance
111

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