Electricity: electrical systems and devices – Safety and protection of systems and devices – Ground fault protection
Patent
1995-05-17
1996-01-16
Pellinen, A. D.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Ground fault protection
361 49, H02H 314
Patent
active
054853397
ABSTRACT:
In an electric power equipment connected to an electrical power source, a defective ground conductor may result in a dangerous situation for a user. To prevent such a situation, the electric power equipment is provided with a safety electrical assembly having a safety switch mounted between the neutral conductor and the ground conductor on the electric power equipment. The safety electrical assembly also has a female plug provided with a ground socket connected to the ground wire of the power source, a neutral socket not connected to the neutral were of the power source, and one or two power sockets connected to one or two corresponding power wires of the power source. The female plug also has a relay having a normally open switch mounted in series with one of the power wires and a control coil mounted between the one power wire and the neutral socket, and a first light indicator mounted between a stationary contact of the relay and the ground wire in such a manner so as to be visible to the user.
REFERENCES:
patent: 3426342 (1969-02-01), De Langis
patent: 3602772 (1971-08-01), Hundhausen
patent: 3659152 (1972-04-01), De Langis
patent: 3846777 (1974-11-01), Brown
patent: 3942604 (1976-03-01), Black, III
patent: 4687906 (1987-08-01), Fujishima et al.
patent: 5105325 (1992-04-01), Lawrence
Medley Sally C.
Pellinen A. D.
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