⚠️ Electrical Safety & Best Practices
Formula: Vdrop = 2 × L × I × R / 1000
Voltage drop = 2 × Length(ft) × Current(A) × Resistance(Ω/kft)
⚠️ Critical Safety
• Always hire licensed electricians
• Follow NEC/ local codes
• Use proper circuit protection
AWG vs mm²
• 14 AWG = 2.08 mm² (15A max)
• 12 AWG = 3.31 mm² (20A max)
• 10 AWG = 5.26 mm² (30A max)
Pro Tips
• Calculate round-trip distance
• Factor in temperature rating
• Consider future expansion
• Use voltage drop tables
📋 Copper Wire Resistance (Ω per 1000 ft):
| AWG |
mm² |
Resistance (Ω/kft) |
Max Current* |
| 18 | 0.82 | 6.385 | 10A |
| 16 | 1.31 | 4.016 | 13A |
| 14 | 2.08 | 2.525 | 15A |
| 12 | 3.31 | 1.588 | 20A |
| 10 | 5.26 | 0.9989 | 30A |
| 8 | 8.37 | 0.6282 | 40A |
* For chassis wiring, not building wiring
Disclaimer:
This tool provides educational estimates only. Actual cable sizing requires compliance with local electrical codes (NEC, IEC, etc.) and professional engineering review.