Will pressing the test pushbutton on a fixed SwitChek present a hazard to persons working on upstream or downstream equipment?
No. The test voltage generated is floating with respect to earth. The voltage is applied across the switch. The test voltage is applied line side with respect to load side. However, if for example a worker was in direct contact with the wires and earth downstream of the isolation switch that incorporates SwitChek, and the AC supply system has an earth reference (common arrangement), the worker would receive a tingle for one second if the test pushbutton was pressed. The tingle current would be a maximum of 3mA which for some people is below their threshold of perception. In summary, there is no danger upstream or downstream to personnel, VSDs or other equipment as they see no potential difference between phases or appreciable shock current with respect to earth.
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