Load Calculation in Amps

...and we need to know the voltage.

Approximately 1/3 of the total amperage will be on each phase.

Some idea of the voltage would be helpful in your calculations.

Have you looked for formula on the web.

How to Search the Internet - Hannon Library

Try a search for "amperage calculations"

3 Ph 180KW:

12V Ph→Ph= 8660.254A
11KV Ph→Ph 9.447A

Can you fill in the obvious bit of missing information?

Kw= Volt x Amper x square root of 3 x cos phi x 1000

It shall be
Kw= Volt x Amper x square root of 3 x cos phi / 1000

It will depend on your voltage. You haven't stated your location so can't guess sensibly either.

My clue to you is Ohm's Law. Find out what voltage you are using and apply that law.

I'm a little bemused as to why somebody who doesn't know how to calculate this actually needs to know.

Are you an accountant trying to peer review an engineer's cable sizing calculation or something?

If you only have 3 phase loads like motors, you should see about 1/3 of the load on each phase. Anything else could point to a problem.

If you have loads (single phase that is) connected between any phase and neutral, there is no telling without a clamp ammeter on each phase, what each phase is supplying.......it depends upon WHAT is connected and how well the loads have been balanced by the installer, what is switched on or off........

So there is no way anyone here can answer accurately for single phase loading......

Dear Mr. atulsonpal,

It depends upon the Line Voltage and Power Factor. The equation is (as pointed out by other CR4 MEMBER) Sq.Root3 x V x I x Cos(fhi)

I presume (since you have indicated Power as 180 KW) the Line Voltage will be 420 and Power Factor is 0.8, and hence the only unknown I, as seen below can be calculated.

1.732 x 420 x I x (0.8) = 180 x 1000

and in the above equation - the only one unknown is I, which you can calculate.

DHAYANANDHAN.S

That would average 60kW per phase. Divide it by the voltage between phase and neutral, and "Robert is your mother's brother" or so it is said.

Next!

If this is an operational unit, use a clamp-on amp meter on each leg.

Good Luck, Old Salt

My apology in advance!You must be an engineer?

In order to do calculations; It is needed: 1) KW 2) Voltage 3) Frequency 4) 1 -phase or 3 - phase 5) 3 phase and Neutral means star connection i.e I (phase) = I (line) 6) What country? Like America has 208 V 3-phase and middle east 400 V 3-phase system 7) Etc.