Showing papers by "General Cable published in 1971"

Mounting bracket for switch or receptacle

Abstract: This electrical fitting, such as a wall outlet or a switch, has a housing that extends through an opening in a wall and has flange means that extend beyond the sides of the opening across the front of the wall to prevent the housing from being pushed through the opening A bracket fits around the housing and is adjustable along the housing from front to back; and the bracket has a flange that contacts with a back surface of the wall Complimentary locking means on confronting surfaces of the housing and the bracket selectively engage with one another at different positions of the bracket or accommodating the bracket to walls of different thickness

Electrical outlet box

Abstract: This electrical outlet or switch box is of two piece construction. One piece is the body which has an open front and an open back. A separate back plate incorporates the cable clamps and a ground wire terminating screw. This back plate attaches to the box after the cables have been connected to the back plate and after different connections between the cables have been made. It is particularly useful for preterminated wiring harnesses for factory built homes.

Method of shielding high voltage solid dielectric power cables

Abstract: This insulation shielding for high voltage solid dielectric power cables includes a semi-conducting tape helically wrapped on the cable with overlapping convolutions. Voids that exist along the edges of the overlaps are bridged by semi-conducting coating sprayed, dipped, washed, wiped or otherwise applied substantially uniformly in thickness around the circumference of the insulation and lengthwise thereof. This bridging of the voids on the inner side thereof prevents corona in the voids and increases the voltage rating of the cable. The coating is bonded to the tape much more strongly than it is to the insulation so that the coating is pulled off the insulation when the tape is removed for terminations. The invention includes method aspects of applying the coating and the tape wrapping.

Filled telephone cables with irradiated polyethylene insulation

Abstract: This filled communication cable has polyethylene insulation on the conductors irradiated to avoid degrading of the polyethylene by contact with the filler material which is a grease. Ordinarily the filler material contains petrolatum as its major ingredient. The irradiation of the insulation is performed after the insulation is applied to the conductors and before the conductors are brought together in contact with the petrolatum in the cable core.

Moisture block in sheathed telephone cables

Abstract: A powder that swells when it gets wet is placed in an electrical cable between the outer sheathing and the inner sheathing for double sheathed cables or between the sheathing and the core of single sheathed cables so that when and if the outer sheathing is perforated, and water that enters causes the powder to swell and to block the space under the sheathing so that water can not travel along the length of the cable under the sheathing. The powder remains dry as long as there is no perforation of the sheathing, and when dry the powder fills only a part of the space under the sheathing.

Wire terminating machine

Abstract: This machine applies insulation piercing terminals to a plurality of conductors simultaneously and cuts off the conductors where they extend beyond the barrels of the terminals. A cut-off blade attached to the upper crimping die cuts against an anvil that extends across the tops of the terminals beyond the barrels but under the end portions of the conductors that are to be cut off. The blade cuts against the anvil which is preferably made of brass so that the blade can dent the anvil, and accurate alignment of the blade is therefore unnecessary and the blade can cut even though dull.

Apparatus for assembling a component of parts comprising terminations, conductor leads and enclosures

Abstract: This apparatus has means for connecting elements of an electric circuit component by securing terminations to an enclosure, crimping the terminations to conductors, and bending the terminations downward, inward and upward around the end of the enclosure so that the crimped ends and the conductors are within the enclosure. The enclosure is held in a nest which shifts between crimping, forming and discharge stations; and there are tools that are guided into positions to operate on the terminations at the crimping and forming stations.

Electrical terminal structure with wedged conductor

Abstract: A terminating structure in which a tight mechanical grip on a conductor is achieved by wedging the conductor in a hole which is at a slight angle to the vertical tapped hole for a set screw. The screw may be self tapping. The holes are preferably in the front of the terminating structure and in a position where the conductors can be inserted in a straight or almost straight position without having to bend the conductor. The structure can be fabricated from a stamped blank of metal.

Electrical Characteristics and Requirements of Extruded Semi-Conducting Shields in Power Cables

Abstract: An extensive study of conduction mechanism of carbon black dispersion in polyethylene and cross-linked polyethylene has been made in order to create a basis for design of semi-conducting extruded shields. It has been found that an ac resistance-capacitance bridge is a simple and convenient tool for this study. Simplified mathematical equations have been developed which relate electrical parameters of semi-conducting shields as measured by the ac bridge to the physical structure of conducting chains. Requirements and typical properties concerning semi-conducting shields have been discussed.

Electrical connector for telephone cords

Abstract: This electrical connector has a housing and a cover hinged together Conductors and terminals on the conductors are assembled in the housing, and the cover is then swung into closed position where it has a snap lock for holding it closed The housing has different cavities for receiving each terminal and the upper ends of the cavities are constructed so as to distort as the terminals are inserted and then spring back to hold the terminals and their connected conductors in place This connector cannot only be assembled in much less time than prior connectors, but in the event of an error in the relation of the terminals, the error can be easily corrected; and repairs are also facilitated since the connector can be reopened without removal of any rivets or other fastenings

Impregnation of communication cables with solid filling compound

Abstract: This invention fills communication cables with a filling compound of petrolatum mixed with some polyethylene to prevent dripping at temperatures of 80*C and below. A rapid cooling of certain compounds from above the melting point changes the characteristics of the compound so as to bring the drip temperature to this value. An impregnator apparatus is supplied with metered quantities of the compound at a rate coordinated with the speed of travel of a cable through the impregnator apparatus; and the cable is impregnated with the water repellent compound in a solid though soft condition (as opposed to liquid), and with uniform results lengthwise of the cable. The cable itself acts as the impeller for the compound in the impregnator; and the impregnator is kept full under pressure by a pump with a by-pass.

EEI-Manufacturers 500/550 KV CableE Research Project. Cable D-High Pressure Oil Paper Pipe Type

Abstract: This paper covers General Cable Corporation's development and testing of a 500 KV high pressure pipe type oil filled cable. It also covers the installation of a sample length of this cable at the Edison Electric Institute test site at Waltz Mill, Pennsylvania.

Magazine feed storage conveyor

Abstract: This magazine feed storage conveyor is for reels of electric cable which are too heavy for a man to lift. Reels of cable are brought by shuttle cars to either end of a long frame which is open at both ends. The cars are tilted to roll the reels off and into the storage magazine formed by the frame. A conveyor belt has elements which contact with the reels above their center axes to roll the reels selectively into and out of the magazine and to advance them in the magazine to make room for additional reels. Automatic switches at each end of the frame condition the motor circuit to operate the conveyor in one direction or the other, depending upon which end a reel approaches from. Limit switches determine how far the conveyor moves with each operation.

Cord connector for printed wiring cards

Abstract: This electric cable connector for printed wiring cards has an insert spacer at the location where the contacts of the connector are joined to the conductors of the cable and between the upper and lower layers of contacts when the connector is for a doublefaced printed wiring card. The spacer has channels for the individual contacts with the sides of the channels forming barriers between adjacent contacts and providing for convenient soldering of the conductors to the contacts of the connector. The use of shrink tubes is no longer necessary. The connector assembly has a shell or housing that houses the connector body, the spacer and the wires of the electrical cable; and there is a polarizing tongue extending from the housing in position to cooperate with a depression in the handle of a printed wiring card.

Pipe type cables with improved skid wire protection

Abstract: This specification discloses an electric cable with a skid wire that has a lower co-efficient of friction than metal skid wires and is made of synthetic material having electric resistance that is too high for the skid wire to maintain electric continuity between an electrostatic shield of the cable and a metal surface in a pipe or other conduit in which the cable is installed. Metal or other good electrical conducting means extends through the skid wire with exposed surfaces of the metal in position to maintain the desired electrical continuity between the electrostatic shield and the conduit. The skid wire has a perforated metal center strip with plastic extruded along both sides of the strip and locked together in a one piece extrusion by portions of the plastic extending through the perforations in the strip.

Method and apparatus for measuring corona inception voltage on overhead conductors and the like

Abstract: With this invention, corona inception voltage in uninsulated overhead lines is detected by placing a sensitive direct current galvanometer in position to detect the change from negative to positive space charge around the overhead conductor when corona discharge begins. The galvanometer, with low pass filters, is placed in series with the power line, and the low pass filters prevent the relatively heavy capacitive alternating current from flowing through the direct current galvanometer coil.

Electrical conductor with paper insulation

Abstract: This electrical conductor is insulated with paper formed by squeezing the water out of a ribbon of woodpulp applied to the conductor. The novel features include the offcenter location of the conductor in the ribbon so that the portion of the ribbon extending from one side of the conductor is long enough to wrap all the way around the conductor and over itself in a lap seam. A stream of water is applied to one surface of the paper to refloat some of the fibers that are in position to extend across the seam to lock the seam closed when the ribbon is wrapped around the conductor.

Wall receptacle with improved connector terminal construction

Abstract: This improved wall receptacle has a housing with slots in the front wall for receiving the prongs of electrical cord fittings and has terminals in the housing held in depressions of the housing and in position to contact with the prongs that are inserted through the slots. These terminals are constructed with barrels that grip conductors of a power cable and that can be secured to the cable before being inserted into the housing. In the preferred construction, the terminals are held in the housing by a back portion of the housing that is detachably connected to the portion into which the terminals fit. The construction can be made so that the power conductors require no bending for either entrance or termination. A ground connection can also be provided with the barrel clamping feature for the ground wire.

Overload Classification of Secondary Network Cables Modified Test Procedure

Abstract: This paper describes a new test procedure for determining the damage threshold temperature for secondary network cables. Present network cables generally have a maximum damage threshold temperature of 260°C and are protected by class L260 network limiters. The new procedure is considered suitable for evaluating cable designs for damage threshold temperatures up to 340°C, and adaptable for higher temperatures by increasing the rate of cooling of the conduit.