Marquette Hellige GmbH MAC 1100/1200 V 1.1 Page 56
227 492 20 D - 0002
7.1.3.2 Protective Earth Resistance Test
The power cord is to be included in the protective earth resistance test.
This test determines whether the device has a power ground fault.
- The protective earth resistance from power connector to any protective earth
connected exposed conductive part is measured.
- Specs. of test circuit: AC current source 50 Hz/60 Hz of at least 10 A up to 25
A with limited output voltage of 6 V.
- If resistance is greater than 100
mOhm, the unit fails this test.
7.1.3.3 Measurement of Leakage
Current
To perform the suggested measurements,
the unit being tested has to be separated from any interconnection to a system. If the
unit is part of a system, extended tests according to IEC 601-1-1 have to be per-
formed. The following diagram shows the
Measuring Circuit [M] required for leakage current. The reading in mV corresponds to
µA (leakage current). The Safety Testers generally work with this Measuring Circuit
[M] and the displayed values are already converted to leakage current.
7.1.3.3.1 Enclosure Leakage Current Test
This test is performed to measure leakage current from chassis to ground during
normal condition (N.C.) and single fault conditions (S.F.C.).
In all cases, the leakage current is measured from any exposed conductive parts to
ground, the unit being tested has to be switched on and off.
Connect the unit being tested to your Safety Tester.
- During normal condition (N.C.), referring to the electrical diagram, measurements
have to be done under the following conditions:
* Polarity switch Norm and RVS
* GND switch GND closed
* S1 closed and open
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