Nearly every commercial electrical project requires plans stamped by a licensed professional engineer before the jurisdiction will issue a permit. The specific thresholds and rules vary by state and sometimes by local jurisdiction, but the general principle is consistent: commercial electrical systems above a certain size or complexity must be designed by a licensed PE. Our commercial electrical engineering team produces PE-stamped electrical packages for projects in all 50 states.
The General Rule for Commercial Electrical PE Stamps
Most states require PE-stamped electrical drawings for commercial buildings, industrial facilities, and multi-family buildings above a certain size. The threshold for what triggers a PE stamp requirement varies, but common thresholds include projects with a service size of 400 amps or greater, projects with three-phase power systems, projects in occupancies classified as commercial or industrial under the applicable building code, and any project where the AHJ (authority having jurisdiction) determines that the complexity warrants engineering review.
Some states have very broad requirements that effectively cover all commercial electrical work above a very low threshold. Other states are more permissive and allow licensed electricians to submit plans for smaller commercial projects without a PE stamp. The safest approach for any commercial project is to check the state electrical licensing requirements and the local jurisdiction requirements before submitting for permit.
PE stamp requirements for EV charging installations on commercial properties follow the same rules as other commercial electrical work. If the charging installation requires a service upgrade, new sub-panels, or distribution equipment, those elements must be included in the PE-stamped electrical package.
What the PE Actually Stamps
Single-Line Diagram
The single-line diagram (SLD) is the primary electrical drawing required for permit. It shows the power distribution hierarchy from the utility service entrance through the main panel, sub-panels, and to the major loads. Every switching device, protective device (circuit breakers and fuses), and metering point appears on the SLD with voltage ratings, interrupting capacity, and frame/trip ratings. The SLD is the document the building department reviewer uses to evaluate whether the electrical system is designed for safe operation.
Panel Schedules
Panel schedules list every circuit in every panel, showing the load served by each circuit, the circuit breaker size, the wire gauge, and the demand load. The PE prepares panel schedules by calculating the load for each circuit and summing the loads to determine panel and service demand. Panel schedules are used during permit review to verify that panels are not overloaded and that protective devices are properly sized for the conductors they protect.
Load Calculations
Load calculations document how the total connected load was determined and how the demand factor was applied to arrive at the design load for each panel and for the service entrance. NEC Article 220 provides the calculation method for most building types. The PE uses these calculations to size the service entrance conductors, transformers, and switchgear that make up the electrical distribution system. Our engineering team provides complete load calculations as part of every commercial electrical package.
Difference Between a Licensed Electrician Submittal and a PE Package
A licensed electrician can pull permits for residential electrical work and in some jurisdictions for smaller commercial projects. The electrician’s submittal typically consists of a permit application, a basic description of the work, and in some cases a simple sketch of the proposed circuits. This level of documentation is generally acceptable for work within residential service parameters.
A PE-stamped electrical package is a full engineered document set: cover sheet with project information and code basis, single-line diagram, panel schedules, load calculations, equipment specifications, and any special system documentation required by the jurisdiction. The PE takes professional responsibility for the design and certifies that it complies with the NEC and applicable local electrical codes.
When Exemptions Apply
Some jurisdictions allow exemptions from PE stamp requirements for small commercial projects below defined thresholds. Common exemptions include simple lighting and receptacle circuits in small tenant improvements where the existing electrical service is unchanged, replacement of existing equipment in kind without capacity changes, and emergency repairs to maintain occupancy. These exemptions are jurisdiction-specific and should be verified with the local building department before proceeding without a PE stamp.
Consequences of Skipping the PE Stamp
Submitting electrical drawings for a commercial project without a required PE stamp results in permit rejection and schedule delays. In some jurisdictions, proceeding with electrical work without a permit or without required engineering can result in stop-work orders and requirements to remove and redo the work with proper documentation. The cost of rejected submittals and delayed permits far exceeds the cost of the PE stamp. We provide commercial electrical engineering efficiently so that permit submittals are complete and correct the first time.
Frequently Asked Questions
Does an electrical PE license differ from a structural PE license?
Yes. PE licenses are issued by discipline. An electrical PE is licensed to practice electrical engineering. A structural PE is licensed to practice structural engineering. For a project requiring both structural and electrical engineering, both a structural PE and an electrical PE must stamp their respective portions of the drawings. We hold both electrical and structural PE licenses in all 50 states.
What code version applies to my project?
Each jurisdiction adopts a specific edition of the National Electrical Code and may have local amendments. The PE must design to the code edition adopted by the jurisdiction where the project is located, not necessarily the most recent published edition. We verify the adopted code edition for every project before starting design.
Can the same PE stamp both the structural and electrical drawings?
Only if that PE holds licenses in both disciplines in the applicable state. Many engineers are licensed in only one discipline. We are licensed in both structural and electrical engineering in all 50 states, which allows us to provide complete multi-discipline packages for projects that require both.
Get Your Commercial Electrical Package Engineered
We provide PE-stamped commercial electrical engineering for projects in all 50 states, with fast turnaround. Submit your project at rightangleeng.com/get-started.
References
National Fire Protection Association. (2023). NFPA 70: National Electrical Code. Article 220: Branch-Circuit, Feeder, and Service Load Calculations. Quincy, MA.
National Society of Professional Engineers. (2019). State-by-State Engineering Licensure Requirements.
International Building Code. (2021). Chapter 27: Electrical. International Code Council.