Electric field shielding system for AC electrically powered device with a two-blade plug
First Claim
1. An E-field shield apparatus for an ungrounded electrical device, comprising:
- electrically conductive shield means for shielding at least one electrical conductor associated with the electrical device;
polarized connecting means for connecting two electrical conductors of the electrical device to an electrical outlet,said polarized connecting means including a polarized electrical connector having only two connectors for connection to the electrical outlet;
a first connector of said polarized electrical connector connected to a source of AC power connected to one connector of the electrical outlet;
a second connector of said polarized electrical connector connected to an AC neutral return wire connected to another connector of the electrical outlet;
said second connector connected to said electrically conductive shield means;
said first and second connectors polarized for connection only to the one and another connectors of the electrical connector, respectively.
1 Assignment
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Accused Products
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.
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Citations
30 Claims
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1. An E-field shield apparatus for an ungrounded electrical device, comprising:
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electrically conductive shield means for shielding at least one electrical conductor associated with the electrical device; polarized connecting means for connecting two electrical conductors of the electrical device to an electrical outlet, said polarized connecting means including a polarized electrical connector having only two connectors for connection to the electrical outlet; a first connector of said polarized electrical connector connected to a source of AC power connected to one connector of the electrical outlet; a second connector of said polarized electrical connector connected to an AC neutral return wire connected to another connector of the electrical outlet; said second connector connected to said electrically conductive shield means; said first and second connectors polarized for connection only to the one and another connectors of the electrical connector, respectively. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. An E-field shield apparatus for an electrical device, comprising:
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electrically conductive shield means for shielding at least one electrical conductor associated with the electrical device; polarized connecting means for connecting two electrical conductors of the electrical device to an electrical outlet, said polarized connecting means including; a polarized electrical connector having two connectors for connection to the electrical outlet; an electrical cable connected at one end to said polarized electrical connector, said electrical cable including two conductors; and a double pole switch for controlling supply of electrical power to the electrical device, said double pole switch connected to said electrical cable for disconnecting both electrical conductors of the electrical device from electrical power thereby eliminating a potential source of E-field radiation; a first connector of said polarized electrical connector connected to a source of AC power connected to one connector of the electrical outlet; a second connector of said polarized electrical connector connected to an AC neutral return wire connected to another connector of the electrical outlet; said second connector connected to said electrically conductive shield means; said first and second connectors polarized for connection only to the one and another connectors of the electrical connector, respectively. - View Dependent Claims (27)
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28. A method of shielding E-field emitted by an ungrounded AC electrical appliance, comprising the steps of:
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placing an E-field shield in a vicinity of the appliance; and connecting the E-field shield to a neutral terminal of an AC power source. - View Dependent Claims (29, 30)
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Specification