How Transformer Voltage Changes Current
Learn how transformer voltage affects current at the same kVA. Calculate primary and secondary amps, verify the inverse voltage ratio, and apply the result to feeder and conductor planning.
Guides
Elecatrix educational articles support calculators and field workflows.
Transformer Current Chart by kVA and Voltage
Use a transformer current chart by kVA, voltage, and phase to calculate primary and secondary amps. Includes separate 15 kVA and 1500 kVA examples and formulas.
Transformer kVA, Volts, and Amps Formula
Calculate transformer kVA, voltage, or current from any two known values. Use the single-phase and three-phase formulas, worked examples, and field-check limits.
Single-Phase vs. Three-Phase Transformer Amps
Compare single-phase and three-phase transformer current calculations. Use the correct kVA-to-amps formula, see a worked 45 kVA example, and verify nameplate voltage and connection.
1500 kVA Transformer Secondary Current
Calculate 1500 kVA transformer secondary current at the actual low-voltage nameplate rating. See three-phase amp examples and review bus, feeder, protection, and fault-current implications.
1500 kVA Transformer Primary Current
Calculate 1500 kVA transformer primary current from the nameplate primary voltage. Includes three-phase and single-phase formulas, examples, and field-review limits.
15 kVA Transformer Secondary Current
Calculate 15 kVA transformer secondary current for single-phase and three-phase systems using the actual secondary voltage. Includes formulas, examples, and feeder-review limits.
15 kVA Transformer Primary Current
Calculate 15 kVA transformer primary current from the actual primary voltage. See single-phase and three-phase formulas, worked examples, and field review limits.
1500 kVA Transformer Amps
Calculate 1500 kVA transformer amps on the primary or secondary side. Use the correct line voltage and phase multiplier for three-phase or single-phase current.
15 kVA Transformer Amps
Calculate 15 kVA transformer amps at 120V, 208V, 240V, and 480V. Use the correct single-phase or three-phase formula for primary and secondary full-load current.
How to Convert Transformer kVA to Amps
Convert transformer kVA to amps using voltage and phase. Calculate primary or secondary full-load current for single-phase and balanced three-phase transformers.
How to Choose Wire Size for a Long DC Run
Learn how to size wire for a long DC run using two-conductor loop resistance, voltage-drop limits, AWG comparisons, and a separate ampacity review.
12 AWG vs. 20 AWG vs. 22 AWG for Low-Voltage Wiring
Compare 12 AWG, 20 AWG, and 22 AWG low-voltage wire by resistance, loop resistance, and 24V voltage drop with a practical calculation example.
24V Control Circuit Voltage Drop by Cable Length
Calculate 24V control circuit voltage drop by cable length, current, and AWG wire resistance. Compare estimated load voltage with the device minimum-voltage requirement.
24V Wire Size Guide for Control Circuits
Calculate 24V control-circuit voltage drop, verify load voltage at the device, and compare cable resistance options before selecting a final wire size.
Wire Resistance vs. Voltage Drop
Learn how wire resistance and load current create voltage drop. Calculate circuit voltage drop in volts and percent, compare conductor resistance, and review long-run sizing.
How Temperature Changes Wire Resistance
Learn how conductor temperature changes wire resistance, calculate adjusted resistance from a 20°C reference value, and see the effect on voltage drop.
Copper vs. Aluminum Wire Resistance
Compare copper and aluminum wire resistance at the same AWG, length, and temperature. Calculate resistance per 1000 ft, total circuit resistance, and voltage-drop impact.
How to Calculate Wire Resistance from AWG and Length
Calculate wire resistance from AWG and conductor length using resistance per 1,000 ft. Learn how to account for loop length and apply the result to voltage-drop calculations.
22 AWG Wire Resistance
Calculate 22 AWG wire resistance, account for round-trip circuit length, and compare 22 AWG vs. 20 AWG voltage drop for low-voltage control wiring.
20 AWG Wire Resistance
Calculate 20 AWG wire resistance for copper control and signal circuits. See resistance per 1,000 ft, loop-resistance formulas, a 20 AWG vs. 22 AWG example, and 24V DC voltage-drop guidance.
12 AWG Wire Resistance
Calculate 12 AWG wire resistance by material, conductor length, temperature, and circuit path. Learn how to apply the result to voltage-drop and load reviews.
AWG Wire Resistance Chart: 12, 20, and 22 AWG
Compare 12 AWG, 20 AWG, and 22 AWG wire resistance per 1000 ft for copper conductors. Scale by length and use the result for voltage drop and wire size review.
Insulation Resistance Testing: Field Procedure, Standards & Interpretation
DC insulation resistance testing explained: megohmmeter readings, test voltage selection, temperature correction, OSHA/NFPA 70E rules, and IEEE 43/NETA ATS interpretation.