Wire load is everyone in the purchase of wires are more concerned, the current life of the more commonly used wire specifications are 1 square wire, 1.5 square wire, 2.5 square wire, 4 square wire, 6 square wire, etc., so how many watts can these wires load, this is also more concerned about everyone. Let's tell you in detail how many watts can be loaded with 1, 1.5, 2.5, 4, and 6 square wires.
Wire load current value specified in Chinese national standard GB/T 4706.1-2005 (partial)
The allowable long-term load current of 1 square copper core wire is: 8A--12A
The allowable long-term load current of 1.5 square copper core wire is: 12A--15A
The allowable long-term load current of 2.5 square copper core wire is: 16A--25A
The allowable long-term load current of 4 square copper core wire is: 25A--32A
The allowable long-term load current of 6 square copper core wire is: 32A--40A
1. How many watts and how much current can a 1 square wire load?
1 square copper wire can withstand 6 amps. One square of aluminum core cable can withstand a current of 3A-5A.
The amperage of current that copper wire can withstand is related to the length of the cable, the form of wiring and the ambient temperature of the cable. Indoors, copper wires below 6 square millimeters are generally safe with a current of no more than 10A per square meter.
Estimated by the "Electrician's Experience Algorithm":
Because the copper core wire can pass about 4.5-5A rated current per square millimeter, and in the single-phase 220V line, the current per 1KW is about 4.5A, and the current per 1KW power is about 2A in the three-phase (including three-phase four-wire system) circuit, so it can be selected, if it is a single-phase circuit, the wire required for each 1KW power is basically 1 square millimeter, and in the three-phase circuit, every 1 square millimeter of copper wire can pass about 2-2.5KW power current.
2. How many watts can a 1.5 square wire load?
Although the usage rate of 1.5 square wire is not as high as that of 2.5 square wire, it also has its own wire load limit. The current calculation method of 1.5 square wire is as follows: the current carrying of household wire is generally single-phase, and its power (Pm) is: Take 1.5 square millimeters as an example:
Pm = voltage U× current I = 220 volts× 22 amps = 4840 watts, take the safety factor of 1.3, then its long-term work, the allowable power (P) is: P = Pm÷ 1.3 = 4840÷ 1.3 = 3723 watts.
So a 1.5 square wire can withstand a load of 3723 watts.
3. How many watts and how much current can a 2.5 square wire load?
The safe ampacities of 2.5 square wires ≈ 22A.
According to the different line voltages, 380V and 220V are commonly used, and their carrying loads are different:
1、220V单向交流电：P=IUcosφ=220×22×0.9=4.4kw
2、380V三相交流电:P=√3IUcosφ=1.732×380×22×0.9=13kw
Fourth, how many watts can a 4 square wire load?
According to the formula, the safe ampacity of 4 square copper wire is calculated according to 6 square aluminum wire, and its safe current carrying capacity is 7 times of the cross-section, that is, 6x7 = 42A, so the safe current carrying capacity of 4 square copper wire is 42A.
In the case of three phases, the power is calculated as follows:
P = 1.732UIcosφ = 1.732x0.38x42x0.85 = 23kW (calculated by three-phase mains, the power factor is 0.85).
In the case of single phase, the power is calculated as follows:
P=UIcosφ=0.22x42x0.65=6kW (calculated by single-phase mains, the power factor is 0.65).
5. How many watts and how much current can a 6 square wire load?
There is no direct correlation between the power line diameter and the power delivered by the 6 square wires. Generally speaking, 6 square wires are more than enough to be used as air conditioning cables. The maintenance power supply on the construction site generally uses 10x6+1x4 cables. As for the current intensity withstanding, according to my construction experience, this kind of cable is generally controlled by a 63A air switch. A 6 square aluminum wire can load 6 kilowatts, and a 6 square copper wire can carry 10 kilowatts.
6. How many watts and how much current does a 10 square wire load?
One square copper core can withstand 7A current.
So 10 square copper cores can withstand the current as follows: 10×7=70A
220V single-phase electrical appliances with a kilowatt 4.55A current.
Then we can divide the current withstood by 10 square copper cores by the current that one square copper core can withstand to get how many kilowatts can be withstood by 10 square copper cores as follows: 70A÷ 4.55≈15.4KW.