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Whenever we specify voltages and currents in a three-phase system, unless otherwise stated, we always refer to line values. 'Lines' (or 'line conductors') are those conductors that connect a three-phase supply to its load.

So the '400 A' and '380 V' quoted in the question are line values (as opposed to phase values).

The equation for the power of a three-phase load is given by:

P = 1.732 x line voltage x line current x power factor

Since, in your question, you make no mention of power factor, we shall assume that the power factor is unity (i.e. the load is purely resistive) and, so:

P = 1.732 x 380 x 400 x 1 = 262 272 W (or 262 kW)

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