First, aluminum core cables should be used in general environments, copper core cables should be used in places with severe vibration and special requirements; copper core cables should be used in large-scale important public buildings.
Second, for buried cables, armored cables with outer sheaths should be used; in places where there is no possibility of mechanical damage, plastic sheathed cables or lead-clad cables with outer sheaths can also be used;
Third, in the soil where displacement may occur, (such as swamps, quicksands, large buildings) buried laying should use steel wire armored cables, and measures can also be taken to eliminate the stress on the cables due to cable displacement, such as prestressing Leave the cable length and use sheet piles or rows of piles to reinforce the soil.
Fourth, in the soil with chemical corrosion or stray current corrosion, it is not suitable to bury cables in the ground. If it is necessary to bury the ground, anti-corrosion cables should be used or measures to prevent stray currents from corroding the cables should be adopted.
Fifth, the cables laid in the pipe or the pipe should be plastic sheathed cables, or bare armored cables.
Sixth, when laying cables in cable trenches or cable tunnels, there should be no flammable and prolonged outer sheath, and bare armored cables, bare lead cables or flame-retardant plastic sheathed cables should be used.
Seventh, cables with outer sheath or all-plastic power should be used for overhead laying.
Eighth, when cables are laid in places with large height differences, plastic insulated cables, non-drip cables or dry insulated cables should be used.
Ninth, four-core cables should be used in three-phase four-wire lines.
Tenth, fire-resistant cables can be used for important backup trunk lines (such as the tie line between the backup generator set and the transformer).