Personnel protection circuit

Details Personnel protection circuit Personnel protection circuit

H - Electricity

02

H

317/12.2

H02H 3/00 (2006.01) H02H 3/28 (2006.01) H02H 3/32 (2006.01) H02H 7/26 (2006.01)

Patent

CA 1161104

PHN. 9741 10 ABSTRACT: A personnel protection circuit for electrical supply systems comprises a normally closed switch con- nected between a source of electric power and a load. Two parallel conductors are connected between the switch and the load and include a control circuit having a current unbalance detector for detecting current unbalance between the two conductors. Upon detection of such current unbalance the normally closed switch is opened thereby disconnecting the electrical power supply. Such control circuit devices may be included in both lines of the electrical supply system between the source and the load, or alternatively, further control circuit devices may be provided at both the source and and the load end of the parallel conductors. The control cir- cuit is suitable for use in cable transmission systems and in which the use of a return conductor is not necessary.

377055

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