Electric field shielding system for AC electrically powered devi

Details Electric field shielding system for AC electrically powered devi Electric field shielding system for AC electrically powered devi

1993-07-12

1995-11-07

Shoop, Jr., William M.

Electrical transmission or interconnection systems

Anti-induction or coupling to other systems

Magnetic or electrostatic field control

219528, 307326, 313479, 348818, H01J 3100, H04B 328, H05K 900

Patent

active

054650135

ABSTRACT:
An electric field shield for non-grounded AC powered appliances is connected to a neutral return terminal of the AC power distribution system. A polarized two prong connector assures connection of the shield to neutral. By eliminating a requirement for connection of the shield to ground, shields are made available for appliances precluded from ground connection such as bedding heaters. A double pole control switch is included to eliminate E-field generation in an OFF state caused by improper wiring or the use of unpolarized intermediate connectors. The shield is insulated and a current limiting device is series connected between the shield and neutral to reduce electrical hazards.

REFERENCES:
patent: 3039075 (1962-06-01), Stollman
patent: 3697896 (1972-10-01), Sarkozi et al.
patent: 3982098 (1976-09-01), Trostler
patent: 4041364 (1977-08-01), Gauper, Jr.
patent: 4931625 (1990-06-01), Marlinski
patent: 5132649 (1992-07-01), Sakamoto et al.
patent: 5218185 (1993-06-01), Gross
The New York Times Article, "Scientists Debate Health Hazards of Electromagnetic Fields", Jul. 11, 1989.

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