1. What is a 3 Phase Heater Current Calculator?

Definition: This calculator determines the current required for a three-phase electric heater based on power, voltage, and power factor.

Purpose: It helps electrical engineers and technicians properly size wiring and circuit protection for three-phase heating systems.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( I \) — Current (amps)
• \( P_{kW} \) — Power (kilowatts)
• \( V \) — Voltage (volts)
• \( PF \) — Power factor (unitless, typically 1.0 for heaters)

Explanation: The formula converts kW to watts (×1000) and divides by the product of voltage, power factor, and √3 (1.732) for three-phase systems.

3. Importance of Current Calculation

Details: Accurate current calculation ensures proper selection of conductors, overcurrent protection, and control components for safe operation.

4. Using the Calculator

Tips: Enter the heater power in kW, system voltage (default 480V), and power factor (default 1.0 for resistive heaters). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: Why is the power factor 1.0 for heaters?
A: Electric heaters are purely resistive loads, so the current and voltage are in phase (PF = 1.0).

Q2: What's the √3 factor for?
A: In three-phase systems, the √3 accounts for the phase difference between line-to-line and line-to-neutral voltages.

Q3: When would I use a different power factor?
A: Only if the heater has significant inductive or capacitive components, which is rare for standard heating elements.

Q4: How do I find the heater power rating?
A: Check the manufacturer's specifications or nameplate on the heater equipment.

Q5: Does this work for both delta and wye systems?
A: Yes, as long as you use the correct line-to-line voltage for your system configuration.