https://kmeng.ca/ Working notes on ampacity, protection, grounding, and power systems design. en-ca Thu, 09 Jul 2026 12:00:00 GMT https://kmeng.ca/blog/cec-vs-nec-underground-ampacity/ https://kmeng.ca/blog/cec-vs-nec-underground-ampacity/ Thu, 09 Jul 2026 12:00:00 GMT Same copper, same trench, same 600 A load — and two codes hand you different conductors. The gap isn't a mistake in either book. It's what happens when one code publishes a 75 °C column and the other makes you derive it. ampacity underground cec nec termination-temperature