DE3401393A1 - Safety cable for high current intensities - Google Patents

Abstract

The subject matter of the invention, "Safety cable for high current intensities" is the design and wiring up of an electrical cable for high current intensities and high voltages in order to prevent cable fire and arcing.

Description

Safety cable for high currents

The invention relates to a safety cable for the prevention of Cable fire and electric shock.

According to the currently applicable regulations, a cable for high A grounded protective line is carried along with currents and high voltages. The one Circuit forming lines, consisting of the live line and the neutral line, can be protected with a residual current circuit in addition to the fuse will.

Are weak circuits with high currents (e.g. car electrics) usually only secured with a backup These security measures can do not prevent a cable fire if there is a defect between the Lines forming a circuit in the cable form a bridge whose resistance high enough to keep the amperage below the maximum rating of the fuse of the circuit. This flow of current can with a correspondingly high level of protection of the circuit can reach a considerable amount of current and lead to overheating of the cable and lead to a cable fire.

In this invention, as shown in the accompanying drawing, proposed a cable in which the in an outer insulating sheath (5) a circuit forming lines (1) and (2) initially as in conventional Cables from an insulation layer (3) and to the outside additionally from a conductive one Sheath (4) are enclosed.

If the cable is used in the heavy current area, the conductive Cover (4) used as a grounded protective line The circuit from the lines (1) and (2) may be formed in the manner described above via a fault current circuit be secured.

The cable described has the following compared to conventional cables Advantage: In the event of a defect, the short-circuit current is basically also over the conductive sheath (4) used as a protective line. Is the circuit As described, it is additionally protected by a fault current circuit, it is now interrupted even at a minimal current intensity, which in no case leads to a Cable heating. In this way, cable fires caused by cable defects can be prevented will.

The cable in the embodiment described also offers an essential Better protection against electric shock if damaged by a conductive object than conventional cables, since in any case the live line (1) short-circuited with the earthed conductive sheath (4) used as a protective line will. This leads to an immediate interruption of the circuit.

The safety cable described can also be used advantageously in low-power circuits Use with high amperage (e.g. car electrics), here you will mainly use single-core Use cables and use the sheet metal housing as the second line of the circuits, The conductive sheath (4) is also placed under tension here and also forms with the sheet metal housing a circuit, but in the immediate vicinity of the Power source (car battery) a relay is switched, which already at minimal Currents interrupts all circuits. If this cable is damaged, it will first the circuit of the conductive sheath (4) short-circuited and via the relay at minimum current strength, the entire current flow is interrupted directly at the current source.

In this way, cable fires can be prevented in car accidents Leaking gasoline can burn out the vehicle.

The safety cable described can be used with plug connections as follows Type of construction are connected: Via a short conductive sleeve (6), which is connected to the outside by a Insulating layer (7) of the same length is enclosed, a long conductive sleeve (8), also surrounded by an insulating layer (9) of the same length. the Inner radii of the conductive sleeves (6) and (8) are slightly larger than the outer radii the cable lines (1) and (2) and the conductive sheath (4).

If you slide a stepped end of the safety cable into the connector, this creates a contact between lines (1) and (2) with the short sleeve (6) and the conductive sheath (4) with the outer long conductive sleeve (8).

If the long sleeve (8) is provided with ring clips, the inserted Cable ends are clamped and the connector can thus be subjected to tensile loads.

The plug connection can be used as a coupling connection (10) with two inputs be designed for cable extension, or as a collective connection (11) with more than two entrances.

Claims (4)

Claims 1.) Single or multi-core security cable for high Current intensities, characterized in that all in an outer insulating jacket (5) located, a circuit forming lines (1) and (2) from an insulation layer (3) and then to the outside all or at least those under tension Lines (1) from a conductive sheath (4) to be used as a grounded protective line or as a line of a circuit with the protection of a low current strength are enclosed. 2.) Safety cable according to i, characterized in that at his Use in circuits with high voltage, the lines forming a circuit (1) and (2) are protected by a residual current circuit. 3e) safety cable according to 1., characterized in that in his When used in low-voltage circuits, the conductive sheath (4) is connected to a circuit is, which over a relay with low amperage the circuits of the lines (1) and (2) interrupts for high currents. 4.) Plug connection for safety cable according to 1., characterized in that that via a short conductive sleeve (6), which is covered on the outside by an insulating layer (7) Surrounded by the same length is a long conductive sleeve (8), also by one Insulating layer (9) is enclosed and the plug connection as a coupling connection (10) with two inputs for cable extension or as a collective connection (11) with more than two entrances is designed.