A five-core cable is one that has five mutually insulated core wires, and on the outside there is a plastic sheath or a steel armor plus a plastic sheath that surrounds the five core wires.
It includes five core conductors with insulation layers, and an outer sheath is provided outside each core conductor. One core conductor has a circular, circular and flat cross-section, and the other four core conductors have a cross-section. Corrugated structure, the outer edges of the corrugated shape are arcs, the inner edges are straight lines, and four core conductors with a corrugated cross section are distributed inwardly around the core conductor with a circular cross section, and Fillers are filled between the core conductors.
Three-phase five-wire system
Five-phase in the three-phase five-wire system refers to: three phase wires plus a neutral wire and a ground wire. The most widely used low-voltage transmission method is the three-phase four-wire system, which uses three phase wires plus neutral to supply power. The neutral wire is led and grounded by the neutral point of the transformer. The voltage is 380 / 220V. Form a 220V power supply line for general households, and the voltage between the three phase lines is 380V, which is generally used for power. People often say that the TN-S system is a three-phase five-wire system. In fact, it is wrong. According to the national code JGJ46-2005 Construction Site Temporary Electricity Safety Technical Specification, 9.14, the three-phase five-wire system is wrong. It can only be said that it is a five-core cable.
Three-phase four-wire system
Three-phase four-wire system: three phase wires plus one neutral wire
The three-phase five-wire system has one more ground wire than the three-phase four-wire system. It is used in places with high safety requirements and uniform grounding requirements.