PV systems wrapper
Why you care (60 seconds)
PV systems have unique current calculations and rapid shutdown requirements. Mistakes are costly and can create serious safety hazards.
Where people lose time
- Using standard load rules instead of PV current calculations.
- Missing rapid shutdown requirements for rooftops.
- Mixing PV and utility interconnection rules.
This is
The rule in plain language
PV systems require specific current calculations, disconnecting means, and rapid shutdown features to protect installers and first responders.
When it applies
Any time PV equipment is installed or connected to a building electrical system.
What you must do (checklist)
- Calculate PV circuit currents using PV-specific rules.
- Provide required disconnects and labeling.
- Implement rapid shutdown where required.
- Coordinate with utility interconnection requirements.
Quick examples
- PV string current is calculated differently than standard loads.
- Rapid shutdown equipment must be listed and correctly located.
This is not
Common misreads
- Treating PV circuits like standard DC circuits without PV rules.
- Assuming rapid shutdown is optional on rooftops.
What it doesn't cover
- Structural or roof attachment requirements.
- Utility interconnection agreements.
False friends
- A disconnect alone does not satisfy rapid shutdown requirements.
Exceptions & edge cases
- Some PV installations have different rapid shutdown boundaries.
- Energy storage systems may introduce additional requirements.
Cross-references (NEC map)
- Primary: 690.8, 690.12
- Secondary: 705
Exam traps
- Mixing PV current calculations with standard conductor sizing.
- Missing rapid shutdown trigger distances.
Field notes
- Keep a PV system labeling checklist in the closeout packet.
- Verify rapid shutdown operation during commissioning.
AHJ / Local amendments notes (placeholder)
- Add local amendments or interpretations here.
Revision notes
- Draft wrapper created for PV system fundamentals.