| 摘要 |
An electrical control positioned between the power cord and the electrically energized appliance to require a proper ground for the electrical appliance before said apliance can be energized by the actuating switch. A test circuit actuated by the presence of current between the B+ line and ground line prior to actuation of the circuit from the B+ line to the load and to the neutral line requires that the ground line be properly installed before the circuit is closed to the load of the electrical appliance to energize the same and maintain it energized.
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