5. Secondary Voltage and Current Ratings • Common secondary voltages – o 120V, 208V, 240V, 277V, 480V, 600V • Often configured as single-phase or three- phase systems. • Full Load Current Calculation Formula –
𝐼𝐼 = kVA×1000 √ 3× 𝑉𝑉 LL (for three-phase) 𝐼𝐼 = kVA× 𝑉𝑉 1000 LL (for single-phase) o 75 kVA, 480 V (three-phase): 𝐼𝐼 = 75,000 √ 3×480 ≈ 90 A
• Typical Example:
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