The relationship between electric vehicle cable conductor cross-sectional area and current
Release：2024/02/01
The relationship between electric vehicle cable conductor cross-sectional area and current
The relationship between electric vehicle cable conductor cross-sectional area and current:
The general copper wire safety calculation method is:
The safe current carrying capacity of 2.5 square millimeter copper power cord is 28A.
The safe current carrying capacity of a 4 square millimeter copper power cord is 35A.
The safe current carrying capacity of 6 square millimeter copper power cord – 48A.
The safe current carrying capacity of a 10 square millimeter copper power cord is 65A.
The safe carrying capacity of 16 square millimeter copper power cord – 91A.
The safe carrying capacity of 25 square millimeter copper power cord – 120A.
If it is aluminum wire, the wire diameter should be 1.5-2 times that of copper wire.
If the copper wire current is less than 28A, it is definitely safe to take 10A per square millimeter.
If the copper wire current is greater than 120A, take it as 5A per square millimeter.
The current that can normally pass through the cross-sectional area of the electric vehicle cable conductor can be selected according to the total number of currents it needs to conduct. Generally, it can be determined according to the following jingle:
Ten below five, one hundred above two, two five three five four three realms, seven ten nine five times and a half, copper wire upgrade counts.
To explain, for an aluminum wire less than 10 square meters, the square millimeter is multiplied by 5. If it is a copper wire, it is one step higher. For example, for a 2.5 square meter copper wire, it is calculated as 4 square meters. Anything over 100 square meters is calculated. Multiply the cross-sectional area by 2, multiply it by 4 if it is less than 25 square meters, multiply it by 3 if it is more than 35 square meters, and multiply it by 2.5 if it is 70 square meters or 95 square meters. These few formulas should be easy to remember, right?
Note: This can only be used as an estimate and is not very accurate.
In addition, if you remember that copper wires with a diameter of less than 6 square millimeters indoors are safe if the current per square meter does not exceed 10A. From this perspective, you can choose 1.5 square meters of copper wire or 2.5 square meters of aluminum wire.
Within 10 meters, the wire current density is 6A/mm2, which is more suitable. 10-50 meters, 3A/mm2, 50-200 meters, 2A/mm2, and above 500 meters, it should be less than 1A/mm2. From this perspective, if it is not very far away, you can choose 4 square meters of copper wire or 6 square meters of aluminum wire.
If the power supply is really 150 meters away (regardless of whether it is a high-rise building), 4 square meters of copper wire must be used.
The impedance of an electric vehicle cable conductor is directly proportional to its length and inversely proportional to its wire diameter. When using the power supply, pay special attention to the wire material and wire diameter of the input and output wires. To prevent excessive current from overheating the wires and causing accidents.
The impedance of electric vehicle cable wires is directly proportional to its length and inversely proportional to the wire diameter. When using the power supply, special attention must be paid to the wire diameter of the input and output wires to prevent accidents caused by overheating due to excessive current.
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