1. The choice of wire and cable model number
Consider the application, installation conditions and security, when you choose wire and cable. For example,
According to different applications, you can select the power cables, overhead insulated cables, control cables, etc.;
Depending on the installation conditions, you can choose the general plastic insulated cables, steel tape armoured cable, steel wire armoured cable, anti-corrosion cable, etc.;
According to the security requirement, you can choose flame-retardant cables, halogen-free flame retardant cable, fire-resistant cable, etc.
2. The choice of wire and cable specifications
Make sure the specifications (conductor cross section) of wire and cable, generally consider the selection condition of fever, voltage loss, economic current density, mechanical strength, etc.
According to experience, because of the large load current of low voltage power line, generally select section according to the heating conditions first, and then calculating the voltage loss and mechanical strength; Low-pressure flare path, because of its higher requirements on voltage level, can select section according to the allows the voltage loss condition first, and then calculating the heating condition and mechanical strength; For high voltage line, select section according to economic current density first, and then calculating the heating conditions and allowed voltage loss; And for high voltage overhead line, should also check its mechanical strength.
