700 kcmil THHN Copper Ampacity
700 kcmil copper THHN: 520A base at 90°C, 460A usable after 110.14(C) termination limit.
Base520A
Usable460A
NEC Table310.16
Full derating calculation
Applications
700 kcmil copper handles high-capacity commercial and industrial feeders.
Voltage drop by distance
| Distance (ft) | 240V Drop | % Drop | Verdict |
|---|
Requirements vary by state. NEC edition, licensing, permits, and GFCI rules differ by jurisdiction. Check your state or pick it below for personalized info across WireRef.
Important: For reference only. Not a substitute for a licensed electrician. Electrical work can cause serious injury, death, fire, or property damage if performed incorrectly. Always hire a licensed electrician for electrical work, especially for service upgrades, panel work, and 240V circuits. Values are derived from NFPA 70 (NEC) for educational purposes. Always verify against your locally adopted NEC edition and amendments - local jurisdictions may enforce stricter requirements. WireRef provides reference information only and is not responsible for work performed based on this content. NEC® is a registered trademark of the National Fire Protection Association. Free NEC access via NFPA · OSHA Electrical Safety · Terms of use.
NEC 2023 references verified April 2026