A.2 Tests on Mains Powered Class 1 & 2 Equipment According To IEC 601.1/UL 2601.1
1. Test P.E. 1 - Protective Earth Continuity
• Applicable to Class 1, Types B, BF and CF.
• Measures impedance of Protective Earth Terminal to all exposed parts of the instrument under
test, which are connected to the Protective Earth.
• Normally includes the wiring in the mains cable (maximum 0.2 Ohms). Without the mains ca-
ble, the maximum is 0.1 Ohms.
• Test current: 25 Amps, applied for a minimum of five seconds.
2. Test I.R. 1 - Insulation Resistance - Mains Part to Case
• Applicable to Class 1, Types B, BF and CF.
• Measures insulation resistance of power leads (live and neutral wires together) to the Protec-
tive Earth terminal of the instrument under test.
• Minimum: 2.0 MOhms.
3. Test I.R. 2 - Insulation Resistance - Applied Part to Case
• Applicable to Class 1, Types BF and CF.
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