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Introduction of Three Kinds of Wire and Cables

Jul 5, 2023 | Operation and Maintenance | 0 comments

A cable is a collection of wires used to transmit power or signals. It consists of multiple insulated wires, usually wrapped in a sheath to provide electrical insulation and mechanical protection. Cables are used in a wide variety of fields such as construction, power systems, communication networks and industrial equipment. This article will introduce you to three kinds of wire and cables and their respective characteristics, they are wire and cable ZB, wire and cable PE and wire and cable JB.

Wire and cable ZB

ZB—B class flame retardant, flame retardant grade, that is, the property of the substance or the material after treatment that obviously delays the spread of flames, and it is a grade system based on this.

Fire rating of wire and cable

Flame retardant is divided into ABC three flame retardant grades, which are distinguished according to the different cable materials used: A grade is the best, and ZR defaults to C grade.

The flame retardant grade of plastic is gradually increased from HB, V-2, V-1 to V-0:

. HB: The lowest flame retardant grade in the UL94 standard. It is required that for samples 3 to 13 mm thick, the burning rate is less than 40 mm per minute; for samples less than 3 mm thick, the burning rate is less than 70 mm per minute; or extinguished before the 100 mm mark;

. V-2: After two 10-second combustion tests on the sample, the flame goes out within 60 seconds. Burning objects may fall;

. V-1: After two 10-second combustion tests on the sample, the flame goes out within 60 seconds. There must be no burning objects falling;

. V-0: After two 10-second combustion tests on the sample, the flame goes out within 30 seconds. There must be no burning objects falling.

Flame retardant cables ZR, ZA, ZB, ZC

ZA, ZB, ZC. ZR in front of the cable model stands for flame retardant (if grades A, B, and C are not marked, it is generally judged to be grade C), and ZC stands for grade C flame retardant. So ZR and ZC mean the same thing.


Wire and cable PE

PE line, the English full name is protecting earth, and the simplified Chinese name is called the protective conductor. That is what we usually call the ground wire. The PE wire is a conductor specially used to ground the exposed conductive part of the electrical device. It is not important whether it is directly connected to the grounding electrode (TT) that has nothing to do with the working grounding of the power point or through the neutral point of the power supply (TN). They are all called PE lines.

The relationship between PE and PEN
The PEN wire is a conductor that functions as both a protective earth wire and a neutral wire. In the project, it is mostly used for a section of line between the low-voltage side of the substation and the user’s power inlet point (TN-C section of TN-C-S). The PEN line is to accurately and well ground the original neutral line, and at the same time connect the shell of the equipment to be protected to the PEN line. Therefore, the PEN line has the grounding properties of the above-mentioned PE line and also has the N line ( Neutral line, neutral line) has the nature of driving the load, but PEN is usually used to save materials and be applied in special places. According to the relevant standards for power line deployment, the PE+N line system should be used as much as possible, that is, completely independent deployment PE protection wire, not PEN, which bundles N wire and PE wire together. Once the PEN system encounters a grounding problem, the N wire will sometimes be charged due to unbalanced load, which can easily cause personal injury. So remember, if possible, you should deploy independent PE protection lines to the best of your ability. Even if you don’t deploy PE protection, it’s better not to use PEN. I personally think that PEN lines are only things that should be checked unless they are required in a specific field. He even more dangerous than not deploying a protective line

How to distinguish PE line
According to the provisions of GB9089.2: The protective conductor (PE conductor) is a conductor used to electrically connect any of the following components to meet certain needs: exposed conductive parts, external conductive parts, main grounding terminals, grounding electrodes, Power grounding point or artificial grounding point. The neutral conductor (N conductor) is a conductor connected to the neutral point of the system and capable of transmitting electrical energy. It can be seen that the N line is the neutral line and the working line, and it is also called “zero line” in the single-phase system; without it, the equipment may not work normally. The PE wire is the ground wire connected to the equipment casing. Without it, the equipment may be able to work, but the casing may be charged; it can prevent electric shock accidents. In practice, people often connect it as a “protective neutral conductor”, that is, connect it as a PEN wire, which has the functions of PE wire and N wire.

The role of the ground wire PE
The role of the ground wire is very important, because the products of a type of structure need to rely on the ground wire as a safety protection. Since the internal structure of the first-class structural product is the basic insulation structure, once the basic insulation fails, the dangerous current will be guided to the ground through the protective grounding wire, thereby protecting people and property. Therefore, its symbol identification, wire size, insulation color, grounding wire impedance, and connection method all have very clear and strict requirements and test verification methods in the field of electrical engineering and safety regulations.

Classification of grounding wire PE
In order to facilitate maintenance, the country has unified the color and letter symbols of the wires. The colors of the three phase wires are yellow, green, and red, the letters are A, B, and C, and the single-phase live wire is represented by the letter L. The neutral wire is blue and the letter N. The ground wire is a yellow-green two-color wire with the letter PE. Single-core cables are generally black and there is no color difference. Some ground wires of multi-core cables are not yellow-green double-colored wires, but also black.

cable PE

Wire and cable JB

JB stands for machinery industry standard, and JB standard is the standard of China machinery industry, which is a kind of industry standard.

Wire and cable GB

GB is a national standard, and a national standard refers to a standard that is approved and released by the national standardization authority, is of great significance to the national economic and technological development, and is uniform throughout the country. National standards are unified technical requirements throughout the country. The standardization administrative department of the State Council shall formulate plans, coordinate project division of labor, organize formulation (including revision), unified approval, numbering, and release. If the law stipulates otherwise for the formulation of national standards, Execute in accordance with the provisions of the law. The period of national standards is generally 5 years, after which the national standards will be revised or re-formulated. In addition, with the development of society, the country needs to formulate new standards to meet the needs of people’s production and life. Standards are therefore dynamic information.

The difference between JB and GB of wire and cable

JB is the mechanical industry standard. GB is the national standard. Two standards are implemented, which cannot be used together for comparison at all. GB is higher than JB, and JB is stricter than GB. JB and GB are not at the same level. GB is fundamental, and JB should put forward higher requirements on the basis of following GB.

Wire and cable industry standard
Industry standards are standards formulated for technical requirements that do not have national standards but need to be unified within a certain industry across the country. Industry standards must not conflict with relevant national standards. Relevant industry standards should be coordinated and unified without duplication. Industry standards shall be abolished immediately after the implementation of corresponding national standards. Industry standards are managed uniformly by industry standard authorities.

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