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How to Choose the Right IEC 61111:2009 Class for Rubber Insulating Mats
How to Choose the Right IEC 61111:2009 Class for Rubber Insulating Mats

How to Choose the Right IEC 61111:2009 Class for Rubber Insulating Mats

How to Choose the Right IEC 61111:2009 Class for Electrical Insulating Rubber Mats


1. Determine Your Maximum System Voltage
Start by identifying the highest voltage present in the work area.
  • Measure the nominal voltage of live parts (transformers, switchgear, cables).
  • Consider any temporary overvoltage or surge potentials (lightning, switching transients).

2. Apply a Safety Margin
IEC 61111 voltage classes are discrete steps. To prevent breakdown under unexpected conditions:
  • Pick the next higher class above your system’s maximum voltage.
  • For example, if your highest live voltage is 11 kV, choose Class 3 (26.5 kV working voltage).

3. Match to IEC 61111 Class Table
Once you know your system voltage plus margin, use this reference:
IEC 61111:2009 Class Test Voltage Working Voltage Dielectric Strength
0 5 kV 1 000 V 10 kV
1 10 kV 7 500 V 20 kV
2 20 kV 17 000 V 30 kV
3 30 kV 26 500 V 40 kV
4 40 kV 36 000 V 50 kV



4. Account for Environmental and Operational Factors
Beyond voltage, consider how, where, and how often the mats will be used:
  • Contamination risk (oil, dust, moisture): choose mats with higher slip-resistance grades.
  • Mechanical stress (foot traffic, tool drops): thicker mats offer greater durability.
  • Outdoor vs indoor: UV-resistant finishes matter if mats see sunlight.

5. Validate with Risk Assessment
Perform or review a formal risk assessment to confirm:
  • All live-working tasks and their voltages are catalogued.
  • Possible overvoltage scenarios are covered by the selected class.
  • Environmental hazards will not undermine insulation integrity.

6. Implement and Maintain
  • Mark or tag mats with their IEC 61111 class so users can verify compatibility at glance.
  • Train personnel to match mats to specific jobs and voltages.
  • Inspect, clean and retest mats per the standard’s intervals to ensure ongoing protection.









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