1. What is the Southwire Voltage Drop Calculator for Canada?

Definition: This calculator estimates voltage drop in electrical circuits using the Southwire formula adapted for Canadian standards.

Purpose: It helps electricians and engineers ensure proper voltage levels in electrical installations, preventing performance issues.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( VD \) — Voltage drop (volts)
• \( I \) — Current (amps)
• \( L \) — Length of conductor (meters)
• \( R \) — Resistance per unit length (mV/A/m)

Explanation: The formula accounts for both the outgoing and return paths (hence the factor of 2) in single-phase systems.

3. Importance of Voltage Drop Calculation

Details: Proper voltage drop calculation ensures electrical equipment receives adequate voltage for optimal performance and safety.

4. Using the Calculator

Tips: Enter the current in amps, conductor length in meters, and resistance in millivolts per amp per meter. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: Why is the formula multiplied by 2?
A: The factor of 2 accounts for both the "hot" and "neutral" conductors in single-phase systems.

Q2: What's a typical acceptable voltage drop?
A: Canadian Electrical Code recommends no more than 3% voltage drop for branch circuits and 5% for feeders.

Q3: Where do I find resistance (R) values?
A: Consult conductor specifications or CEC tables for mV/A/m values based on wire size and material.

Q4: Does this work for three-phase systems?
A: No, this formula is for single-phase. Three-phase uses a different calculation (replace 2 with √3).

Q5: How does temperature affect the calculation?
A: Higher temperatures increase resistance. For precise calculations, use resistance values adjusted for operating temperature.