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• Time of issue:2023-03-14
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(Summary description)1、 Overview of control cables
The cables connecting the control center to various systems for transmitting signals or controlling operational functions are collectively referred to as control cables. The early functions of control cables were relatively simple, including: indicator light display, instrument indication, operation of relays and switchgear, alarm interlocking system, etc. In recent years, due to the widespread application of weak current and computer networks, new functions have put forward higher requirements for the selection and application of control cables.
2、 Main series varieties of control cables
The main products of control cables today include PVC insulated control cables, natural styrene butadiene rubber insulated control cables, and polyethylene insulated control cables. In addition, there are also cross-linked polyethylene insulation and ethylene propylene rubber insulation products. The oil immersed paper insulated lead wrapped control cables produced in the early years have been phased out.
The rated voltage of the control cable is expressed in U0/U. The national standard issued in 1998 in China stipulates that the rated voltage of plastic insulated control cables is 450/750V. Foreign countries have proposed 600/1000V products as the conventional product series for control cables. At present, China can also produce 600/1000V plastic insulated control cables. The rated voltage of rubber insulated control cables is specified as 300/500V.
The control cable core is copper core, with a nominal cross-section of 2.5mm and below, with 2-61 cores; 4-6 mm, 2-14 cores; 10mm, 2-10 cores. Control the working temperature of the cable: rubber insulation at 65 ℃, polyvinyl chloride insulation at 70 ℃ and 105 ℃. The control cables used in computer systems generally use PVC, polyethylene, cross-linked polyethylene, and fluoroplastic insulation products.