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11.9.2 Electrical Safety Inspection Test
1. Perform protective earth resistance test:
a. Plug the probes of the analyzer into the protective earth terminal and equipotential
terminal of the AC power cord.
b. Test the earth resistance with a current of 25 A.
c. Verify the resistance is less than 0.1ohms (100 mohms).
d. Plug the probes of the analyzer into the protective earth terminal of the AC power
cord and the protective earth terminal of any auxiliary outlet. Repeat steps b and c.
e. If the resistance is larger than 0.1ohms (100 mohms) but less than 0.2ohms (200
mohms), disconnect the AC power cord and plug the probe that is previously plugged in
the protective earth terminal of the AC power cord into the protective earth contact of
the power outlet. Repeat steps a to d.
2. Connect the compressor, if configured, to the auxiliary electrical outlet.
3. Perform the following earth leakage current tests:
normal polarity;
reverse polarity;
normal polarity with open neutral; and
reverse polarity with open neutral.
4. Verify the maximum leakage current does not exceed 500 μA (0.5 mA) in the first two
tests. While for the last two tests, verify that the maximum leakage current does not
exceed 1000 μA (1 mA).
NOTE
Make sure the safety analyzer is authorized by certificate organizations (UL, CSA,
or AMAI etc.). Follow the instructions of the analyzer manufacturer.
If cart is not configured, do not perform auxiliary outlet related tests, and the
above mentioned AC power outlet should refer to the power outlet of the
equipment.
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