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earth ground such as a water pipe, as shown in Figure 1.
3. Use an AC voltmeter, with 1000 ohms/volt or more sensitivity, to
measure the potential across the resistor.
4. Check each exposed metallic part, and measure the voltage at each
point.
5. Reverse the AC plug in the AC outlet and repeat each of the above
measurements.
6. The potential at any point should not exceed 0.75 volts RMS. A leakage
current tester (Simpson Model 229 or equivalent) may be used to make
the hot checks, leakage current must not exceed 1/2 milliamp. Should
the measurement is out of the limits specified, there is a possibility of a
shock hazard, and the equipment should be repaired and rechecked
before it is returned to the customer.
1.2. Caution for AC Mains Lead
5
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