30.1 Leakage current. Leakage current shall be
measured at maximum steady state power line voltage and frequency, for each
voltage and frequency at which the equipment is designed to
THIS TEST MAY BE HAZARDOUS DUE TO THE UNGROUNDED
CONDITION OF THE EQUIPMENT DURING THE TEST. DO NOT TOUCH EXPOSED METAL SURFACES
WITHOUT ADEQUATE ELECTRIC SHOCK PROTECTION.
THE UNITED STATES GOVERNMENT
NEITHER ASSUMES NOR ACCEPTS RESPONSIBILITY FOR ANY INJURY OR DAMAGE THAT MAY
OCCUR DURING OR AS A RESULT OF THIS TEST.
30.2 Equipment test connection. After power removal, each equipment directly
connected to an external power source and units deriving power from the
equipment shall be placed on an insulated surface. All safety ground conductors
between the equipment and units deriving power from the equipment shall be
intact. The safety ground conductor between the equipment and the source power
shall be opened during the test. OBSERVE WARNING STATEMENT. The equipment shall
be connected as shown in Figure 7 if connected to single phase power, as shown
in Figure 8 if connected to 3-phase power, and as shown in Figure 9 if connected
to dc power.
30.3 Measurement. Leakage current shall be measured on equipment in its
normal operating configuration. Equipment controls in each operating mode shall
be such that maximum power will be utilized during leakage current measurements.
The leakage current shall be determined by the voltage-drop method. A True RMS
Voltmeter shall be used. The voltage measured across the 1500 ohm resistor, when
equal to 7.5 volts, represents 5 milliamperes of leakage current. The overall
measurement error shall not exceed 5 percent. The probe shall be used on all
external conducting parts such as case, connector housings, recessed calibration
or adjustment controls, and control shafts with knobs removed. The voltage shall
be measured from each part to ground for every combination of switch positions
available in the test diagram. The only safety ground conductor shall be
reconnected immediately after the test is completed.