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A flat cable system includes a flat cable of a first type which has equally spaced flat conductors in a body of insulating material. A cable of a second type has three conductors, the centers of two of which are separated by the same spacing as in the cable of the first type but the third conductor

A flat cable system includes a flat cable of a first type which has equally spaced flat conductors in a body of insulating material. A cable of a second type has three conductors, the centers of two of which are separated by the same spacing as in the cable of the first type but the third conductor is separated from the second by twice the spacing. A cable of a third type has three conductors which are uniformly spaced by the same center-to-center spacing as in the first type. When the cables are used together, the proper conductors are easily aligned for interconnection by using a reference edge adjacent the first conductor in each cable. The conductors are also color-coded.

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A wiring system comprising a transition connection device including a housing; means in said housing defining an opening for receiving and interconnecting a plurality of flat cables, said means including a reference surface at one side of said opening, and four electrically conductive members suppor

A wiring system comprising a transition connection device including a housing; means in said housing defining an opening for receiving and interconnecting a plurality of flat cables, said means including a reference surface at one side of said opening, and four electrically conductive members supported in said housing, said members being uniformly, laterally spaced apart; a cable of a first cable type in said opening, said first cable type having four flat, spaced-apart conductors therein, said conductors being covered with insulation material and having substantially the same lateral center-to-center spacing as said conductive members, said first cable having a reference edge adjacent a first one of said conductors and positioned adjacent said surface; a cable of a second cable type in said opening, said second cable type having three flat spaced-apart conductors therein, said conductors being covered by insulation material, the first and second of said conductors having substantially the same lateral center-to-center spacing as said conductive members, the third of said conductors being laterally spaced from the second conductor by twice the center-to-center spacing of said first and second conductors, said second cable having a reference edge adjacent the first of said conductors and positioned adjacent said surface; cable of a third cable type having three flat spaced-apart conductors therein, said conductors being covered with insulation material, said three conductors having substantially the same center-to-center lateral spacing as said cable of said first type, said cable of said third type having a reference edge adjacent the first of said conductors and positioned at said surface so that said conductors of both said first and second cables similarly spaced from said reference edges are aligned with each other, said conductive members extending into and electrically interconnecting aligned ones of said conductors in said cables.