1. Pre-branch cable: Compared with the busway, it has important characteristics such as light weight, small outer diameter, waterproof, corrosion resistance, good shock resistance, low environmental requirements, but the price is relatively high, and special equipment is needed for hoisting. work.
2. Insulation piercing clamp: This connection method has the characteristics of easy installation, low cost, safety, reliability and maintenance-free features. No need to cut off the main cable, no need to strip the insulation layer of the cable can be done to branch the cable, the joint is completely insulated, live work can be carried out at any location on the cable for on-site branching. No need to use the terminal box, distribution box.
Piercing branch cable joints Disadvantages:
1, cable trunk sheath, insulation is damaged, which is a taboo of electrical engineering;
2. The conductor of the cable trunk is damaged by puncture, which reduces the current carrying capacity;
3, poor contact reliability, large contact resistance and instability;
4, can not be fully sealed, the contact will be oxidized, so that the contact resistance becomes larger;
5, after contact with the Department of thermal expansion and contraction will produce loose, with the extension of time, loosening will become more and more serious;
6 , no multi-core puncture branch cable, frequency conversion system, high harmonic system can not be used;
7, suitable for short-term power supply, not suitable for long-term power supply
8, usually need to check the joint maintenance;
9. The failure rate is relatively high.
Disadvantages of pre-branch cable connectors:
1, can not be produced on the spot;
2. The branch contact distance needs to be measured before it is produced.
The puncture branch cable connector manufacturing features are:
1, puncture contact is basically a mechanical connection multi-point contact
2, contact resistance can not be controlled;
3, contact jacket, insulation damage, although the use of blocking treatment, but the air will enter.
There are four ways to connect electrical devices:
1, the winding connection is to twist the wires together;
2, elastic connection is the use of metal elastic pressure contact;
3, the mechanical connection is to force the screw to connect the connector;
4, compression joints that benefit special molds to suppress joints.
The prefabricated branch cable is connected by compression and factory production features:
1, compression connection, contact closely, the connector can compensate for the joint thermal expansion and contraction of the stress, the contact resistance is small and will not change.
2. After compression connection, the vacuum oxygen injection molding is performed in a very short time, so that the connector is completely sealed and strictly isolated from the oxygen in the air.
3, the production process of industrial production, mechanized production, eliminate the quality problems caused by human factors.
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