Selection method
The rated voltage of the cable is expressed by U0/U(Um): U0 is the rated power frequency voltage between the conductors of the cable design and the ground or metal shield, U is the rated power frequency voltage between the conductors of the cable design, Um is the maximum value of the maximum system voltage that the equipment can withstand.
According to the different laying environment and load of the cable, the specifications of the cable are selected. Non-armoured type suitable.
Used in overhead, indoor, tunnel, cable trench and other occasions, can not withstand J mechanical external force, armored type with non-armored applicable conditions can be directly buried in the ground. Can withstand a certain amount of mechanical external force. Single-core cables are not allowed to be laid in magnetic pipes. Flammable and explosive, chemical corrosion and high temperature, low temperature and other occasions should choose a special type of cable.
Storage and transportation
Cables in storage, should be standardized packaging to avoid long-term outdoor sunlight exposure, reliable sealing of the two ends, do not allow long-term storage in a humid environment, and the cable tray can not be laid flat. When transporting, the height of the tray should be considered and effectively fixed. Several trays are not allowed to be hoisted at the same time, and it is strictly prohibited to push down from the height.
Laying and installation
Special tools, such as pay-off stand and guide roller, should be used for cable laying to prevent mechanical damage and keep away from heat sources during laying.
When cables are routed through pipes, the inner diameter of the pipes should not be less than 1.5 times the outer diameter of the cables. Do not squeeze cables when multiple cables are routed through pipes. The total area of the cables should not exceed 40% of the total area of the pipes.
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