Plan Review and Code Application
The Plan Review Mindset
Plan review questions test whether you can apply the code to a described installation rather than recall a single number. Approach each scenario methodically: identify the occupancy and location, identify the equipment, then identify the applicable article and any modifying article.
A Repeatable Method
- Classify the location: dry, damp, wet; hazardous or not; special occupancy or not.
- Identify the equipment and circuit: branch circuit, feeder, or service; continuous or noncontinuous load.
- Find the governing article: general rule first, then any specific modifying article.
- Check calculations: ampacity, overcurrent protection, box fill, conduit fill, grounding.
- Check installation details: support, securement, clearance, labeling.
Traps
- Jumping to a calculation before confirming the location classification.
- Applying a general rule when a specific article modifies it.
- Missing a required label, clearance, or disconnecting means.
- Forgetting that plan review answers often hinge on the "most specific applicable rule."
Worked Example
A reviewer is given a wet location with a receptacle outdoors. First classify: wet location. Then find the article for receptacles and outdoor outlets, confirm GFCI and weather-resistant requirements, and verify the enclosure is suitable for wet locations. Only then check the branch-circuit sizing. Rule of thumb: classify, then calculate, then verify installation details.
Rule of Thumb
When a scenario feels ambiguous, write down the location, the equipment, and the load type. Those three facts usually point to a single governing article.