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How to Choose the Right IEC 61111:2009 Class for Rubber Insulating Mats
03 Oct 2025
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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.
2. Apply a Safety Margin
IEC 61111 voltage classes are discrete steps. To prevent breakdown under unexpected conditions:
3. Match to IEC 61111 Class Table
Once you know your system voltage plus margin, use this reference:
4. Account for Environmental and Operational Factors
Beyond voltage, consider how, where, and how often the mats will be used:
5. Validate with Risk Assessment
Perform or review a formal risk assessment to confirm:
6. Implement and Maintain
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.