How to choose the size of the wire.

I would like to take a 15.5KW of electrical appliances, with the attack on the length of the short Chi Chi E-law to spend much of the three-phase five-core line. Seek the master to calculate the method. Can give 220V and 380V from the power and current aspects of the calculation formula or table. Of the additional addition. Seek detailed points. There are documents can be sent to.. COM problem added: do not know not to answer. Thank you. More

Answer:

The choice of wire has formulas: 10 under five security, 100 on the two security, .35 four security and three security sector, .95 two and a half, Tube thickness of eighty-nine fold, plus half of the bare wire, copper wire count, wire specifications are: 0..1..2..... / .25 / .50 / .95 / .. 240 units are square millimeters

See circuit current. General copper wire, 1 square mm, can carry 5A. Insurance point by 3 ~ 4A calculation it.

First, the single-phase 220V voltage, power 15.5KW with the rated current I = P / U = 15.5 * 1000/220 = 70.45A16 square copper and 25 square aluminum bearing current is 100A, and then smaller specifications of the wire Up to 70A, two, three-phase 380V voltage, power 15.5KW with electrical, rated current of about 31A. 6 square copper and 10 square aluminum wire carrying current of about 40A. If you intend to use a single attack long short of the short-Chi of the E-law, so you three-phase five-core line, copper wire is not less than 16 square feet, aluminum is not less than 25 square if you use 380V three-phase electricity, then You three-phase five-core line, copper wire is not less than 6 square, aluminum is not less than 10 square feet.