Surge protection wrapper
Why you care (60 seconds)
Surge protection is now a common service requirement. Missing or misplacing SPDs can fail inspection and leave sensitive equipment exposed.
Where people lose time
- Installing the SPD too far from the service equipment.
- Using the wrong SPD type for the location.
- Forgetting required labeling or documentation.
This is
The rule in plain language
Provide a listed surge protective device at required service locations using approved installation methods.
When it applies
New or modified services where the code requires SPD installation.
What you must do (checklist)
- Confirm the service requires an SPD.
- Select a listed SPD for the service equipment.
- Install per manufacturer instructions and minimize lead length.
- Label and document the installation.
Quick examples
- A service panel with an integral SPD meets the requirement.
- External SPDs must be located to keep leads short and protected.
This is not
Common misreads
- Treating a plug-in SPD as a service SPD.
- Installing an SPD without verifying listing requirements.
What it doesn't cover
- Detailed surge coordination for critical facilities.
- Lightning protection system requirements.
False friends
- A surge device for point-of-use does not satisfy service SPD rules.
Exceptions & edge cases
- Some occupancies have added SPD requirements.
- Replacement services may require SPD retrofits.
Cross-references (NEC map)
- Primary: 230.67
- Secondary: 242
Exam traps
- Mixing SPD types and installation locations.
- Missing that an SPD is required at service equipment.
Field notes
- Keep SPD datasheets in the closeout packet.
- Verify lead length during installation to optimize performance.
AHJ / Local amendments notes (placeholder)
- Add local amendments or interpretations here.
Revision notes
- Draft wrapper created for surge protection fundamentals.