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What are the requirements for the selection of wires and cables for electrical equipment

Update:2020-10-14
Abstract:

1. The fundamental characteristics of wire and cable 1 […]

1. The fundamental characteristics of wire and cable
1 Electric function
Conductive function: the resistance of the conductive core (the DC resistance of the wire) and the current carrying capacity.
Electrical insulation function: insulation resistance, withstand voltage characteristics, etc.
2 Mechanical properties
Refers to tensile strength, elongation, tortuosity, elasticity, flexibility, vibration resistance, abrasion resistance and impact resistance.
3 Thermal function
Refers to the heat resistance class of the product, the working temperature, the heating and heat dissipation characteristics of the cable, the current-carrying short-circuit and overload ability, the thermal deformation and thermal shock resistance of synthetic materials, the thermal expansion of materials, and the dripping function of dipping or coating materials, etc. .
4 Corrosion and weather resistance function
Refers to electrochemical corrosion resistance, biological and bacterial corrosion resistance, chemical resistance (oil, acid, alkali, chemical solvents, etc.) corrosion, salt spray resistance, sunlight resistance, cold resistance, mildew resistance and moisture resistance.
5 Aging function
Refers to the ability of products and their constituent materials to maintain their original functions under the action of mechanical (force) stress, electrical stress, thermal stress, and various other external elements, or under external climatic conditions.
6 Other functions
Including the characteristics of the material (such as the hardness of metal materials, creep, compatibility of polymer materials) and some special application characteristics of the product (such as flame retardant, etc.)

2. Selection of wires and flat cables
1. Requirements for wire and cable selection
First of all, you should fully understand the variety, specification, structure and functional characteristics of the wire and cable when choosing, so as to ensure the use of the product and extend the service life. Electrical equipment wires and cables have high temperature resistance, cold resistance, different flexibility, and shielding function. It is necessary to choose reasonably according to the operating conditions.
Secondly, the selection of wires and cables should also be considered in conjunction with the use of connectors and the reasonable wiring design of the whole machine. In the wiring design of wires and cables, various external damage and interference elements (mechanical, thermal, lightning, Elements such as electricity) or adopt corresponding protective measures. For the laying distance, position difference, fixing method and spacing, the form and function of the connector, the configuration method, and the coordination with other line equipment, etc., it is necessary to carefully study and design correctly to ensure the wire and cable Reliable use.

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