Equipment listing and labeling wrapper
Why you care (60 seconds)
Listed equipment is only safe when it is installed and used as intended. Inspectors and plan reviewers expect you to follow listing instructions, and misuse can trigger rework or safety hazards.
Where people lose time
- Skipping installation instructions and assuming a "typical" method works.
- Mixing parts from different systems that are not listed together.
- Ignoring required torque values or enclosure ratings.
This is
The rule in plain language
Use listed or labeled equipment exactly as the listing and instructions require. If the product has limits or conditions, your installation must match them.
When it applies
Any time you install equipment, devices, fittings, or accessories that are listed or labeled.
What you must do (checklist)
- Confirm the equipment is listed for the intended use and environment.
- Read and follow installation instructions and limitations.
- Use accessories and components that are compatible or listed together.
- Apply torque and termination details as specified by the manufacturer.
Quick examples
- Use a breaker that is listed for the specific panelboard.
- Choose enclosures rated for the environment where they are installed.
This is not
Common misreads
- Treating listing instructions as suggestions instead of requirements.
- Assuming a product is approved for any use just because it is listed.
What it doesn't cover
- The full process of selecting equipment for a design.
- Local amendments that add stricter requirements.
False friends
- "Fits" does not mean "listed for" when combining parts.
Exceptions & edge cases
- Field modifications may require special approval or engineering.
- Some equipment has optional configurations that must be documented.
Cross-references (NEC map)
- Primary: 110.3(B)
- Secondary: 110.2
Exam traps
- Choosing an answer that ignores listing limitations.
- Missing the requirement to follow manufacturer instructions.
Field notes
- Keep installation instructions in the job binder or digital file.
- Photograph nameplates and listings for closeout records.
AHJ / Local amendments notes (placeholder)
- Add local amendments or interpretations here.
Revision notes
- Draft wrapper created for listing and labeling fundamentals.