Physics
Transformer Sizing Calculator
Find the transformer kVA needed for a load.
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Size a transformer with headroom above the expected load.
The math behind it
Load kVA = V·I ÷ 1000, then add a safety margin (typically 20–25%) for surges and growth.
Worked Example
230 V, 30 A, 25% margin → about 8.6 kVA.Frequently Asked Questions
Why oversize?
To handle startup surges, future loads and avoid running at full capacity continuously.
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