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A volt ampere (symbol: V.A) is the unit of measurement for the apparent power of a load connected to an AC supply. Apparent power is the product of the supply voltage and the load current. Apparent power is the vector sum of a load's true power (measured in watts) and reactive power(measured in reactive volt amperes). '15 kV.A', means 15 000 V.A.

Further explanation

In the descriptive name "kVA", k = 1000 and VA = volt.amperes.

Volts x amps = volt.amperes, for which there is an international standard unit named the watt.

Therefore 15 kVA is 15 000 volt.amperes which, for a purely resistive load, can also be stated as 15 kilowatts.

If the distribution voltage and type is known, you can then calculate the current in amps that will flow at that power rating if the load is purely resistive i.e. if the power factor is 1.

If the power factor (pf) is less than 1 then, because

watts = volts x amps x pf

then, at a given service voltage, more current must flow to produce the same apparent power as you would get with a purely resistive load.

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