Help calculate the load and wire diameter of the electrical cabinet?

According to you, the load is 76kw. A 25-square-meter copper core is used for the incoming line, and two labels are added if there is an aluminum core. However, it is important to pay attention not to be out of phase when wiring 220V.

Also, if the electrode humidifier and 24kw electric heating you mentioned are one, you need to add a low-voltage starter.

A single-strand copper core wire with a diameter of 6 square meters is sufficient and will not affect the heating of the live wire. If the live wire is hot, use the clamp current meter to measure the current value of the heating live wire, if it is greater than 18 A, it is a problem with the electrical load. Secondly, check whether the screws of the incoming connector are tightened and whether there is any leakage.

Finally, whether the quality of the incoming line meets the requirements.

The distribution box is a massive parameter on the data, which generally constitutes a low-voltage forest according to the electrical wiring, which requires the switchgear, measuring instruments, protective appliances and auxiliary equipment to be assembled in a closed or semi-enclosed metal cabinet or on the screen to constitute a low-voltage distribution box. During normal operation, the circuit can be switched on or off with the help of manual or automatic switches.

Only a small current of 16A, sufficient, certainly will not heat up, you should need a ground wire.

Is the plastic copper core wire just enough, it is recommended to replace it with a cable.

Personally, I have a simple approximate estimation method is a kw is a square, ** with a capacity of 405kw, that is, 405 square cables, taking into account the utilization factor, that is, not used at the same time, with 3 * 185 + 120 cable double, as for the detailed calculation can be 900 A * times (factory electricity multiple) * utilization coefficient industrial greater than 70% about 800 less, if your utilization coefficient requirements are higher, you can choose 3 * 240 + 18150 Larry.

It can be used in parallel with two 240mm sticks.

Now most of the computers are 500w-700w, air conditioners are 2000w, TVs are 500-650w, lights are 42w+9w, and fans are 300w, a total of 3500w

Around 16a.

If the power factor is not considered, that is, the power factor is 1, for a 220V voltage single-phase system, 1KW is the current;

The square millimeter copper core wire can withstand a load of 2200W, and the square millimeter copper core wire can withstand a load of about 3500W

"Computer 150W, TV 70-150W, Household Split Air Conditioner is generally {i.e. 1500W-1650W.

The air conditioner is an inductive device, and the useful power is calculated at 80%, that is, about 1900W. >

That is, the total power is about 2200W and the current is about 10A

The power divided by the working voltage of the electrical appliance is its working current, which adds up to the total electrical current;

Ventilation fans should consider the power factor, right?

The power supply is 16 square meters, and the ground wire is 25 square meters.

Follow your distribution box to switch the safe ampacities to the wiring.

Three items of four-wire quality, the wire diameter is selected by the size of the current.

The load current of the transformer of 250kva depends on what the voltage is, the specific algorithm is: the capacity voltage is the load current, of course, there is reactive power loss, if you are particularly concerned, you can*, the principle of distributing the electric box is that the cable cross-sectional area of the load current of the upper distribution box is greater than the cable cross-sectional area of the secondary distribution box.

Calculation of 250kva transformer rated current calculation:

i s is calculated by the allowable line loss voltage drop of 14V (each line loss voltage drop is 7V, and the line voltage at the distribution cabinet is about 386V), and the resistance value of each line is:

r＝u/i＝7/361≈

Copper core wire cross-section (copper wire resistivity is:

s＝ρ×l/r＝

There is no 135 square wire, 150 square wires can be selected.