What principles should be followed in selecting power cables?
August 05, 2024
The selection of power cables should follow the following principles:
1. Rated voltage:
Select appropriate wires and cables according to the voltage level of the place of use, and ensure that the rated voltage of the cable is not lower than the actual use voltage.
2. Current capacity:
Select appropriate wire and cable cross-section according to the load current to ensure that the cable will not overheat under the maximum load, and the voltage drop is within an acceptable range.
3. Safety requirements:
According to safety requirements, non-flammable cables, flame-retardant cables, halogen-free flame-retardant cables, fire-resistant cables, etc. can be selected.
4. Mechanical strength:
When it is necessary to withstand mechanical tension, pressure and large-span creep resistance, reinforced cables such as copper wire or steel belt armored structural cables can be selected.
5. Economy:
Under high load conditions, select according to economic current density, considering that power loss and capital investment should be within the most reasonable range.
6. Laying conditions:
Select the model and specification of the cable according to the cable laying environment and laying method to ensure that the cable can adapt to specific laying conditions.
7. Environmental factors:
Calculate the resistance and voltage drop of the cable considering the cable laying length and laying method, and select the flame retardant grade of the cable according to the safety requirements of the power system.
8. Comprehensive considerations:
When selecting power cables, it is also necessary to comprehensively consider various factors such as purpose, voltage, environment, etc., and more accurately select the appropriate cable for a specific application through example calculations.
Through the above principles, it can be ensured that the selection of power cables not only meets the actual use needs, but also has safety and economy.