A three-phase 69 kVA load connected to a 120/240-volt three-phase panel will draw how many amps through each conductor?

Study for the Independent Electrical Contractors (IEC) Year 2 Part 3 Test. Use flashcards and multiple choice questions with hints and explanations to prepare confidently. Get exam-ready now!

To determine the current draw through each conductor of a three-phase load, you can use the formula for calculating current from power in a three-phase system:

[

I = \frac{P}{\sqrt{3} \times V_{L}}

]

Where:

  • (P) is the power in watts (or volt-amperes for this calculation),

  • (V_{L}) is the line-to-line voltage,

  • (I) is the current in amps.

First, we need to convert the kVA to watts for the calculation:

[

69 , \text{kVA} = 69,000 , \text{VA}

]

Given that the panel is a 120/240-volt three-phase panel, the line-to-line voltage ((V_L)) in this case is 240 volts. By substituting the values into the formula, we have:

[

I = \frac{69,000 , \text{VA}}{\sqrt{3} \times 240 , \text{V}}

]

Calculating ( \sqrt{3} ) gives approximately 1.732. Now, substituting that value into the

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