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:
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