2026 NEC Changes: Enclosures and Wiring Methods

The 2026 NEC introduces subtle yet critical changes that could turn routine installations into costly field corrections if overlooked. This course examines key updates to enclosures and wiring methods, including new restrictions on service conductors passing through non-service equipment, revised accessibility requirements for recessed boxes, expanded listing requirements for cable support hardware, and updated rules for MC cable in wet locations and NM cable in commercial applications. Participants will also learn about modified bending radius calculations for flat cables, new termination requirements for rigid and intermediate metal conduit, allowances for larger non-metallic raceways, and prescriptive clearance requirements above cable trays.

By the end of this course, you'll be able to:

• Explain when service conductors are allowed in enclosures with other conductors.
• Describe when boxes are required to be rated for ceiling fans.
• Recall the requirements for wiring accessibility in boxes.
• List what types of support hardware require a listing.
• Describe when MC cable is allowed in wet locations.
• List the requirements for NM cable in other than dwellings.
• Recall the bending radius requirements for cables.
• Explain the requirements for terminating rigid metal conduit and intermediate metal conduit.
• State the rules for RMC and IMC fittings.
• List the allowable sizes for various non-metallic raceways.
• Describe the free space rules around cable trays.