1. What is the Wire Size Calculation?

The wire size calculation determines the appropriate conductor size needed for a 200 amp service based on load current, distance, and allowable voltage drop. Proper wire sizing is critical for safety and performance of electrical systems.

2. How Does the Calculator Work?

The calculator uses the wire size formula:

Where:

• \( \text{Load Amps} \) — Current load in amperes
• \( \text{Distance} \) — Length of wire run in feet
• \( \text{Allowed VD} \) — Maximum acceptable voltage drop in volts

Explanation: The equation calculates the required wire size in circular mils to maintain voltage drop within acceptable limits for a given load and distance.

3. Importance of Proper Wire Sizing

Details: Correct wire sizing prevents excessive voltage drop, reduces fire hazards, ensures equipment operates properly, and complies with electrical codes.

4. Using the Calculator

Tips: Enter load current in amps, distance in feet, and allowed voltage drop in volts. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical allowed voltage drop?
A: For branch circuits, 3% is common (3.6V on 120V circuits). For feeders, 2% is often used.

Q2: Does this account for temperature and bundling?
A: No, this is a basic calculation. For precise sizing, consult NEC tables and derating factors.

Q3: What about aluminum vs copper wire?
A: The calculator provides circular mils. You'll need to select actual wire gauge based on conductor material.

Q4: Is this suitable for DC circuits?
A: Yes, the basic voltage drop calculation works for both AC and DC circuits.

Q5: How does this relate to ampacity?
A: Wire must satisfy both voltage drop requirements and ampacity ratings from NEC tables.