The thick wire can withstand a current of 7A

The single-strand copper core wire, because generally, at 25 times, the rated current that 1mm copper core wire can pass through is 4 7A, generally when we choose, we should enlarge a little, for the sake of insurance, the wire used, long-term through this current, is safe.

The copper core wire is roughly estimated to withstand a current of 10A per square meter, and the aluminum core wire is halved.

If you are 7a, you should use a square copper core wire to leave a margin to be safer.

How much power can the square millimeter wire pass through the current You are talking about aluminum wire or copper wire, the safe current of aluminum wire is 22A, copper wire is 30A, this is the indication of wire laying, if the dark wire laying current is slightly smaller, the dark wire refers to the pipe, buried, wall buried, etc., and a few buried together, several factors, the key to consider its calorific value. Then it is to buy the national standard wire, now there are too many lines mixed with pearls, 2, if the vertical limb oak is a square copper core wire, how much power can be used for hungry electrical appliances, that is to say, how many watts of electrical appliances can be borne up to the maximum without burning the wire. The simple calculation is that 1 square millimeter of copper wire is subjected to 2 amperes, then ampere.

5a*220v=1100w

This is calculated from a safety point of view, and there is a kind of calculation according to the allowable voltage drop of the electrical appliances, for example, there is an electrical appliance with higher voltage requirements, its rated voltage is 220 volts, and the allowable voltage error is 5%, that is, the power supply voltage can not be less than 220 * 95% = 209 volts, then the calculation is more complicated, depending on the voltage of your distribution end, and the length of the line from the distribution end to the power station, the rated current of the electrical appliances, and the allowable voltage drop on this line, the above example is the allowable voltage drop of 11 volts, Then select the appropriate copper wire according to the line resistance of the copper wire with different cross-sectional areas.

Theoretically, the overcurrent per square of aluminum wire is 3 amps, and copper wire is 6 amps. Such an overcurrent does not exceed 25 degrees Celsius.

The national standard line can withstand 32 amps in air.

How many amps can a wire withstand? Diameter, or cross-sectional area, in units? Millimetre? centimeters ?..

Theoretically no more than 7a, but also look at the length of your line.

Your topic is inappropriate, you can't ask for the length like this, and the length of the line that is not loaded together is also a short circuit, and it must not be allowed.

It is necessary to know the resistivity of the wire, which is the resistance value per meter of wire.