1. What Is The 3 Phase Transformer Wire Size Formula?

The 3 phase transformer wire size formula calculates the appropriate American Wire Gauge (AWG) size for electrical wiring in three-phase transformer applications. Proper wire sizing is essential for safety, efficiency, and compliance with electrical codes.

2. How Does The Calculator Work?

The calculator uses the formula:

Where:

• \( I \) — Current in amperes (A)
• \( \text{distance} \) — Length of wire in feet (ft)
• \( k \) — Constant value (typically 12.9 for copper)
• \( VD \) — Allowable voltage drop in volts (V)

Explanation: This formula ensures the selected wire size minimizes voltage drop while safely carrying the required current over the specified distance.

3. Importance Of Proper Wire Sizing

Details: Correct wire sizing prevents overheating, reduces energy loss, ensures equipment operates efficiently, and meets electrical safety standards and codes.

4. Using The Calculator

Tips: Enter current in amperes, distance in feet, the appropriate constant value (typically 12.9 for copper wire), and the maximum allowable voltage drop. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is the typical value for constant k?
A: For copper wire, k is typically 12.9. For aluminum wire, it's usually 21.2.

Q2: Why is voltage drop important in wire sizing?
A: Excessive voltage drop can cause equipment to malfunction, reduce efficiency, and potentially create safety hazards.

Q3: How does wire length affect the required size?
A: Longer wire runs require larger wire sizes to maintain the same voltage drop percentage.

Q4: Are there standard voltage drop limits?
A: Most electrical codes recommend a maximum voltage drop of 3% for branch circuits and 5% for feeder circuits.

Q5: Should ambient temperature be considered?
A: Yes, higher ambient temperatures may require larger wire sizes due to reduced current carrying capacity.