1. Selection of wire and cable models
When selecting wires and cables, use, laying conditions and safety shall be considered, for example,
According to different purposes, power cables, overhead insulated cables, control cables, etc. can be selected;
According to different laying conditions, general plastic insulated cables, steel tape armored cables, steel wire armored cables,
anti-corrosion cables, etc. can be selected;
Non flame retardant cable, flame retardant cable, halogen-free flame retardant cable and fire-resistant cable can be selected according to safety
requirements.
2. Selection of wire and cable specifications
When determining the use specifications (conductor cross-section) of wires and cables, the selection conditions such as heating, voltage loss,
economic current density, mechanical strength, etc. shall be generally considered.
According to experience, due to the large load current of low-voltage power line, the section is generally selected according to heating conditions,
and then the voltage loss and mechanical strength are checked;
Since the low-voltage lighting line has high requirements for voltage level, the section can be selected according to the allowable voltage
loss conditions, and then the heating conditions and mechanical strength can be checked; For high-voltage lines,
The section shall be selected according to the economic current density, and then the heating conditions and allowable voltage loss shall be checked;
The mechanical strength of high-voltage overhead lines should also be checked and calculated.
If the user has no experience, he/she should consult the relevant professional unit or person.
When selecting wires and cables, use, laying conditions and safety shall be considered, for example,
According to different purposes, power cables, overhead insulated cables, control cables, etc. can be selected;
According to different laying conditions, general plastic insulated cables, steel tape armored cables, steel wire armored cables,
anti-corrosion cables, etc. can be selected;
Non flame retardant cable, flame retardant cable, halogen-free flame retardant cable and fire-resistant cable can be selected according to safety
requirements.
2. Selection of wire and cable specifications
When determining the use specifications (conductor cross-section) of wires and cables, the selection conditions such as heating, voltage loss,
economic current density, mechanical strength, etc. shall be generally considered.
According to experience, due to the large load current of low-voltage power line, the section is generally selected according to heating conditions,
and then the voltage loss and mechanical strength are checked;
Since the low-voltage lighting line has high requirements for voltage level, the section can be selected according to the allowable voltage
loss conditions, and then the heating conditions and mechanical strength can be checked; For high-voltage lines,
The section shall be selected according to the economic current density, and then the heating conditions and allowable voltage loss shall be checked;
The mechanical strength of high-voltage overhead lines should also be checked and calculated.
If the user has no experience, he/she should consult the relevant professional unit or person.
