Electrical safety test apparatus for detecting leakage current tripping current and proper grounding

摘要

A device for testing the safety of operating electrically powered tools, particular at building sites. A compact housing contains an ammeter or other current indicating device, electrical circuitry and a manually operable switch by which the meter is selectively put in circuit to measure the power-line to frame leakage current in the power-operated tool, the tripping current at which a ground fault interrupter or circuit breaker is set, or to establish that the frame of an electrically powered tool is properly grounded.