# How much power can 1 square wire withstand?

Updated:02-07-2021
Summary:

How much power can 1 square copper wire receive? How mu […]

How much power can 1 square copper wire receive? How much power can 1 square aluminum wire receive?
Aluminum core wire (copper core wire) with a cross-sectional area of ​​1 square, copper wire 5A-8A, aluminum wire 3A-5A.
The current carrying capacity of 2.5 square aluminum core wire and 1.5 square copper core wire is the same, but if possible, try to use copper core wire as much as possible. The strength of aluminum core wire is not good and it is easy to break.
The maximum current-carrying capacity of 2.5 square aluminum core wire is 12.5A, but taking into account the wire passing through the tube. The operating environment temperature and other factors, its safe current carrying capacity is about 9.5A, and the acceptable maximum power is 2000W.
The power that the copper wire can carry is related to the heat dissipation of the wire. Generally, 1 square millimeter can carry about 1 kW of power.
The load current value of the copper wire according to the national standard GB4706.1-1992/1998 rule (part):
2.5 square millimeters (16A～25A)
4 square millimeters (25A～32A)
6 square millimeters (32A～40A)
For the sake of simplicity, it can be calculated as 6A per square rated current, so the power P accepted by KE is:
P=UIcosφ=0.22x6x0.65=0.858kW (according to the standard single-phase electricity calculation, cosφ is the load power factor, and single-phase is generally 0.65), which can be rounded to 1kW.
Generally speaking, the smaller the wire, the lower the total heat output, the better the heat dissipation, the greater the power that can be received per square; the larger the wire, the greater the total heat generation, the worse the heat dissipation, and the power that can be received per square Just smaller.

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