Electricity: electrical systems and devices – Safety and protection of systems and devices – Load shunting by fault responsive means
Patent
1980-09-22
1982-08-17
Salce, Patrick R.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Load shunting by fault responsive means
361 91, 361118, 361119, 175 52PE, H02H 320
Patent
active
043452906
ABSTRACT:
Apparatus for clipping excessive voltage transients in an alternating current power distribution system to protect the electrical system and attached electrical equipment from damage or failure due to said excessive high voltage transients and surges. Varistors are connected from each electrical phase to grounded conductor, referred to as neutral hereafter and also from neutral to ground to provide an additional fail-safe feature. This electrical circuit is contained within a cylindrically shaped hollow enclosure made of a high impact, polypropolene plastic. A plastic potting compound seals all the voids within the enclosure for additional electrical insulation. One end of the cylindrical enclosure terminates in a cap using rounded threads made of the same material as the cylinder which provides access for the circuit. The rounded threads provide protection against overtightening the cap. The opposite end has a threaded extension which mates with a standard electrical knockout and electrical lock nut for mounting. The cylinder, adjacent the body of the extension, is concave to enclose an O-ring or gasket to assist in sealing when mounted on an electrical junction or switchbox.
REFERENCES:
patent: 2720617 (1955-10-01), Sardella
patent: 3486084 (1969-12-01), Zido
patent: 3890543 (1975-06-01), Jonassen
patent: 3894274 (1975-07-01), Rosenberry
patent: 4039904 (1977-08-01), Klein et al.
patent: 4089032 (1978-05-01), Orfano
Jacobson Donald A.
Salce Patrick R.
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