How strong is the load on the wire?
What is a wire?
Electronic wire is an abbreviation of electrical equipment internal wire, electrification is mainly based on weak current, with strong field of cable is different concept.
How is the load of the electronic line calculated?
1. Load for electric wire:
500v and below copper core plastic insulated wire is laid in gas, operating temperature is 30℃, and the load under 100% load for a long time is as follows:
1.5 mm squared - 22 a
2.5 mm squared - 30 a
4 mm squared - 39 a
6 mm squared - 51 a
10 mm squared - 74 a
16 mm squared - 98 a
2. Household products are generally single-phase, and the maximum available power (PM) is: take 1.5mm squared as an example
PM = voltage u× current I = 220v × 22a = 4840w
If the safety factor is 1 and 3, the allowable power (p) for long time operation is:
P = PM ÷1, 3= 4840÷1, 3=3723 watts of "1.5 square" copper wire.It can withstand a load of 3723 watts.
3, 1.5mm squared copper power line safety load is 22a, 220v appearance can bear 3723w power for a long time, so 24 hours to bear the power of 2000 watts is completely no doubt.
General copper conductor load the safe load of the conductor is fixed according to the allowable core temperature, cooling conditions, and American power line laying conditions.The safe load of general copper wire is 5~8a/ mm 2, and the safe load of aluminum wire is 3~5a/ mm 2.In summary, at that time, the power is weak and fierce, plus the quality of power equipment is moderate, so the safe power is 6a per square meter, the power utilization is 7a per square meter, the safe power utilization is about 6a per square meter, the calculation method is as follows:
X 6 a = 10.5 a 1.5 square meters
10.5 a x 220 w = 2310 w
For example: 1.5 mm 2 bv copper wire safety load recommended value 1.5×8a/ mm 2=12a 220v voltage, power = voltage × current =220×12=2640 watts =2.64 kw
When the connecting cable for three-phase electromechanical is not too long (within 10 meters), the load can be 2.5kw(10, 5a), and the load can be reduced correspondingly if the line segment is too long.General press every square load 4 ~ 6a choice, long take small value, short take big value.
Two 1.5 square copper core wire threading rule theory is 3 square, practical load many kilowatts.The voltage at 220v is 2.64 kilowatts.Load is stable, the power changes with the voltage
The capacity of 2.5 square copper core line is 15-23a, if it is single-phase electricity with about 5 kilowatts, three-phase electricity with about 9 kilowatts.
10 square copper core line can load a lot of kilowatts, if used in 220v, open wire layout allows the continuous load current is 70a, equivalent to 15.4kw;The two wires are arranged in the 1 branch tube, and the allowable continuous load current is 60a, equivalent to 13.2 kw.The three wires are arranged in a branch tube with a continuous load current of 55a, equivalent to 12.1 kw.
About according to the load current to plan the power, 1.5 square copper core cable can carry the maximum load close to 25a current, can be used for three-phase power equipment (rated voltage 380v below 2.5kw electromechanical), can be used for single-phase lighting (rated voltage 220v) equipment, each phase can carry the single-phase equipment below 2.5kw.
Generally speaking, the refrigerating capacity of 1 piece is about 2000 CAL, conversion into the international part should be multiplied by 1.162, so the refrigerating capacity of 1 piece should be 2000 CAL ×1.162 = 2324 watts, the watt here (w) means the refrigerating capacity, the American power line is 1.5 pieces should be 2000 CAL ×1.5×1.162 = 3486 (w), with this push.According to this appearance, can roughly determine the number of air conditioning and refrigerating capacity.Under the general surface, 2200 (w) ~2600 (w) can be called 1 piece, 4500 (w) ~5100 (w) can be called two pieces, 3200 (w) ~3600 (w) can be called 1.5 pieces.Maximum current of 1.5 air conditioners is imax=3600/220=17.4a
