312.8 Splices in Panel Enclosures – https://www.MikeHolt.com/code. When it comes to electrical enclosures, “As long as we can get the cover on, we’re good.” is the mindset of many. The NEC has requirements for fill or how much space inside an enclosure is available for wiring and electrical devices as you’ll see when you listen to this podcast on section 312.8.