Circuit arrangement for automatically correctly connecting two two-wire lines respectively connected to a source of power, in parallel

Claim 2

A circuit arrangement for enabling a load to be operated from a plurality of line pairs each of which is fused to a lower rating then required by the load, but which together exceed the current required by the load, said circuit comprising: a first pair of lines, a second pair of lines, means for connecting said first pair of lines to one of said fused pair of lines, means for connecting said second pair of lines to another of said fused pair of lines, means for sensing whether or not said first and second pair of lines are connected to said fused pair of lines with the proper polarity to provide a parallel interconnection having the same output voltage as either of said fused pair of lines, and means operative when said means for sensing detects that said first and second pair of lines are incorrectly connected for parallel interconnection for interconnecting said first and second pair of lines properly for parallel interconnection.

Claim 3

A circuit as recited in claim 1 wherein said means for sensing comprises: a relay having a relay winding, a pair of double-pole, double-throw contacts and a first and a second pair of terminals, said double throw contacts being connected to said first pair of terminals when said relay is inoperative, means for connecting the ends of said relay winding respectively to one line in each of said first and second line pairs which has the same potential when said first and second line pairs are properly connected in parallel and an opposite potential when said first and second line pairs are improperly connected in parallel, said relay having a first and second pair of terminal means, connector means for connecting the first pair of terminal means to said first pair of lines, means for connecting said first pair of terminals to said second pair of terminals for reversing the polarity of the voltage applied to said double-throw contacts when said relay is energized, and means for connecting said double-throw contacts to said second pair of lines.

Claim 4

A circuit arrangement as recited in claim 1 wherein said means connecting said first pair of lines to said first pair of terminals is a circuit breaker.

Claim 5

A circuit arrangement as recited in claim 1 wherein there is included a glow tube means, a first resistance means coupling one side of said glow tube means to said first pair of lines, and a second resistance means coupling the other side of said glow tube means to said second pair of lines to enable said glow tube means to glow when said first and second pair of lines are connected to the respective fused pair of lines in a manner to provide a difference in potential therebetween.

Claim 6

A circuit arrangement for enabling a load to be operated from a plurality of fused line pairs each of which is fused to a lower current rating than required by the load, but which together exceed the current required by the load, said circuit comprising: a first pair of lines, a means for connecting said first pair of lines to one of said fused line pairs, a second pair of lines, means for connecting said second pair of lines to another of said fused line pairs, a normally open single-pole single-throw relay having a relay winding, a terminal and a swinger arm, means connecting said normally open relay winding across said second pair of lines, a double-pole, double-throw relay having a relay winding, first, second, third and fourth terminals and two swinger arms, said two swinger arms being closed to said first and third terminals when said relay is inoperative and moving to close on said second and fourth terminals when said relay is operated, means connecting the terminal of said normally open relay to one line of said first pair of lines, means connecting the swinger arm of said normally open relay to one end of said second relay winding, means connecting the other end of said double-pole double-throw relay winding to one line of said second pair of lines, means connecting said second pair of lines to the two swinger arms of said double-pole double-throw relay, means connecting said first and third terminals of said double-pole double-throw relay respectively to the first pair of lines, means connecting said first terminal to said fourth terminal, and means connecting said second terminal to said third terminal, means connecting said first pair of lines to said first and third terminals and a pair of output terminals connected to said second pair of lines.

Claim 7

A circuit arrangement for enabling a load to be operated from a plurality of fused line pairs each of which is fused to a lower current rating than required by the load, but which together exceed the current required by the load, said circuit comprising: a first pair of lines, a means for connecting said first pair of lines to one of said fused line pairs, a second pair of lines, means for connecting said second pair of lines to another of said fused line pairs, a normally open single-pole single-throw relay having a relay winding, a terminal and a swinger arm, means connecting said normally open relay winding across said second pair of lines, a double-pole, double-throw relay having a relay winding, first, second, third and fourth terminals and two swinger arms, said two swinger arms being closed to said first and third terminals when said relay is inoperative and moving to close on said second and fourth terminals when said relay is operated, means connecting the terminal of said normally open relay to one line of said first pair of lines, means connecting the swinger arm of said normally open relay to one end of said second relay winding, means connecting the other end of said double-pole double-throw relay winding to one line of said second pair of lines, means connecting said second pair of lines to the two swinger arms of said double-pole double-throw relay, means connecting said first and third terminals of said double-pole double-throw relay respectively to the first pair of lines, means connecting said first terminal to said fourth terminal, and means connecting said second terminal to said third terminal, means connecting said first pair of lines to said first and third terminals and a pair of output terminals connected to said second pair of lines.

Claim 8

A circuit arrangement as recited in claim 5 wherein said means connecting said first and third terminals to said first pair of lines includes a circuit breaker.

Claim 9

A circuit arrangement as recited in claim 5 wherein there is included a glow tube means, a first resistance means coupling one side of said glow tube means to said first pair of lines, and a second resistance means coupling the other side of said glow tube means to said second pair of lines to enable said glow tube means to glow when said first and secoNd pair of lines are connected to the respective fused pair of lines in a manner to provide a difference in potential therebetween.