The relationship between the rated voltage of the cable and the

  • All things in the world have their own attributes and levels, not to mention that cable products are widely used and various, even if you are in the industry, you do not know all of them. This article compiled today discusses the rated voltage of Panel Mount Cable and the number of cable cores. A simple analysis of the relationship between them, hoping to help you understand.

     

    1kV and below selection conditions for 1-5 core cables

    1 Single-core Panel Mount Cable: When the line is long, the working current is large, or when the circuit is laid underwater, in order to avoid or reduce the intermediate joint, or when the single-core cable has better comprehensive technology and economy than the multi-core cable, the single-core cable can generally be selected. core cable; low voltage DC supply circuit, single core cable can be used when required.

    2-core Panel Mount Cable: When the neutral point of the power supply of 1kV and below is directly grounded, the number of cable cores in the single-phase loop, when the protection wire and the neutral wire share the same conductor, should use a 2-core cable; DC power supply circuit, it is advisable to use 2-conductor cable.

    3-core Panel Mount Cable: When the neutral point of the power supply of 1kV and below is directly grounded, the number of cable cores in the single-phase loop is: when the protection line and the neutral line are independent, a 3-core cable should be used.

    4-core Panel Mount Cable: 4-core Panel Mount Cable of 1kV and below, in which the fourth core is not only used as a protective ground, but also needs to transmit unbalanced current and short-circuit current in the power system. Its size is determined by the unbalanced current and short-circuit current, but generally not less than 1/2 of the phase line.

    For a three-phase four-wire low-voltage power distribution system of 1kV and below, when the same conductor is used for the protection wire and the neutral wire, a 4-core cable should be used instead of a combination of a 3-core cable and a single-core cable to form a circuit, or direct The method of using the metal sheath or armor layer of the 3-core cable as the neutral wire. Otherwise, when the 3-phase current is unbalanced, it is equivalent to the running state of the single-core cable, which is easy to cause power frequency interference.

     

    5-core Panel Mount Cable: 1kV and below three-phase four-wire low-voltage power distribution system, some electrical equipment distribution lines with high reliability requirements, and some communications that not only ensure electrical damage, but also anti-interference grounding and automation equipment, TN-C low-voltage power distribution system with 5-core wires should be used, so that the protection wire (PE wire) and the neutral wire (PN wire) are independent of each other, and the cross-sectional area of the cable core is generally 3 large and 2 small or 4 large and 1 Small or 5 large.