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Cable Rating Calculation — Portable

When in doubt, go one size larger. The cost of copper today is trivial compared to the cost of a trench re-dig, a fire investigation, or a day of factory downtime.

Always add a safety margin. For continuous loads (running >3 hours), multiply the load current by 1.25 (125%). Step 2: The "Big Three" Correction Factors Cable tables (like NEC Table 310.16 or IEC 60364-5-52) assume perfect conditions: 30°C air, free airflow, and pure copper. Your site isn't perfect. You must derate. cable rating calculation

You look at your cable table. 29A means you need a (approx AWG 10) copper cable for the thermal rating. When in doubt, go one size larger

Disclaimer: This post is for informational purposes. Always refer to your local electrical code (NEC, IEC, BS) and consult a licensed electrical engineer for critical installations. For continuous loads (running >3 hours), multiply the