Quick Hits

🎬 NEC 2026 ARTICLE 110 SERIES

PART 2 — APPROVAL & LISTED EQUIPMENT

NEC 110.2 & 110.3(B) ⚡

Why Listing and Manufacturer Instructions Matter

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⚡ OPENING HOOK

Just because electrical equipment works...

Doesn't mean it's code compliant. ⚠️

🧠 CORE IDEA

⚡ Before equipment can be installed, it must be approved by the Authority Having Jurisdiction (AHJ).

Most approved equipment is listed by a Nationally Recognized Testing Laboratory (NRTL), such as UL, and must be installed exactly as it was evaluated.

Changing how listed equipment is installed—or modifying it in the field—can void its listing and create a code violation.

⚡ CODE CONNECTION

NEC 110.2
✔ Electrical equipment must be approved.

NEC 110.3(B)
✔ Listed or labeled equipment must be installed and used in accordance with the manufacturer's instructions included with the listing.

Ignoring installation instructions isn't just a recommendation...

It's a Code violation.

📌 CORE TAKEAWAY

⚡ Approved equipment is required by the NEC.

⚡ Listed equipment must be installed exactly as the manufacturer specifies.

⚡ Changing listed equipment can void its listing and result in a noncompliant installation.

⚡ FINAL LINE

The listing isn't just a sticker...

It's part of the Code. ⚡

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