Confirm whether the electrical permit falls under the 2026 OESC, effective October 1, 2026, and then read every code reference on the drawings as the 2026 NEC as modified by Oregon’s table of amendments, not the NEC alone. Trace the service, feeders, alternate power sources, protection notes, and equipment listing through the one-line diagram, panel schedules, plans, and specifications, and look for notes that still cite an earlier NEC or OESC edition. AI can flag conflicts; the electrical designer, the electrical inspector, and the building official decide compliance.
What does the OESC cover?
The Building Codes Division adopts, amends, and interprets the Oregon Electrical Specialty Code with building officials, technical committees, advisory boards, and the public, and states that it applies to all nonexempt electrical installations and alterations. The division runs a separate Electrical Code Program, and the Electrical and Elevator Board reviews the code and approves the electrical testing laboratories Oregon recognizes.
The Oregon Building Codes Division’s OESC adoption page states that the 2026 OESC took effect October 1, 2026 and is based on the 2026 NFPA 70, National Electrical Code. It is published as a table of amendments to the 2026 NEC; the division says no integrated codebook is available and links a free read-only 2026 NEC on NFPA’s site, which requires a free account. The adoption record lists a permanent rule filing on October 1, 2026, a public rulemaking hearing on August 18, 2026, and a July 1, 2026 review of low-rise residential electrical provisions by the Residential and Manufactured Structures Board. Checked October 16, 2026. Neither the adoption page nor the Electrical Code Program page stated a phase-in period when read, so confirm with the jurisdiction which edition applies to a permit applied for near that date.
Model code checks are in the NFPA 70 guide; read it alongside the amendment table, because an Oregon row can change the NEC provision it describes. Building work is reviewed under the Oregon Structural Specialty Code, and the Oregon page lists the state’s other specialty codes and official sources.
Gather the electrical set, the NEC, and the amendment table
Collect the electrical general notes and symbols sheet, the one-line or riser diagram, panel schedules, power and lighting plans, the electrical site plan with service and generator locations, fault current and load summaries as stated on the drawings, the electrical specifications and equipment cut sheets, and the electrical permit application or scope. Download the 2026 OESC table of amendments from the Building Codes Division.
Write down which NEC and OESC editions each sheet cites. Electrical sets are often built from office templates, and a general note carried from a project permitted under the earlier OESC can sit beside a one-line drawn for the new edition.
Trace NEC and Oregon amendment items through the electrical set
| Review question | Sources to compare | Decision to record |
|---|---|---|
| Edition and amendment table | Electrical general notes, cover sheet, specifications Division 26 | Confirm the documents cite the 2026 OESC, meaning the 2026 NEC with Oregon’s amendments, rather than the NEC alone or an earlier OESC. |
| Amended provisions the design relies on | Oregon table of amendments, general notes, panel schedules, plan notes | List each amendment row that touches the scope and check the note or schedule that depends on it reads the amended text. |
| Service and disconnecting means | One-line diagram, electrical site plan, service equipment elevation | Match the number, location, and labeling of service disconnects across the one-line, site plan, and elevations. |
| Generators and other alternate sources | One-line diagram, transfer equipment schedule, generator specification, site plan | Confirm every generator or alternate source on one sheet has its transfer or interconnection equipment shown on the others; the division has issued a safety bulletin on generator connections. |
| Equipment listing | Equipment schedules, specifications, cut sheets | Check that specified equipment is listed by a testing laboratory, and compare unusual products with the division’s list of approved laboratories and product categories. |
| Permit scope | Electrical permit application, scope narrative, building permit set | Record which electrical permit covers the work and whether any electrical scope shown on the building set is missing from it; the division publishes a bulletin on electrical master permits. |
The electrical drawing checklist gives a working log for these checks, the lighting controls guide compares control specifications with the plans, and the recreation facility electrical review shows how electrical findings are written up.
Example: two code bases and a generator with no transfer switch
Hypothetical example. A two-story medical office in Salem submits its electrical permit in October 2026. The general notes sheet cites the earlier OESC edition from the firm’s template, while a note on the one-line diagram references the 2026 NEC. The one-line shows a standby generator feeding an automatic transfer switch, but the electrical site plan places the generator pad without the transfer switch, and the equipment schedule does not list one.
General notes on E0.01 cite the earlier OESC edition, while the one-line diagram on E6.01 references the 2026 NEC. The automatic transfer switch shown on the one-line does not appear on the electrical site plan E1.01 or the equipment schedule. Confirm the code edition for the permit and coordinate the generator connection across the one-line, site plan, and schedule.
The electrical engineer updates the notes to the 2026 OESC and adds the transfer switch to the plan and schedule. The finding is a document conflict; the electrical inspector decides whether the installation complies.
Review Oregon electrical drawings with Groundbook
Upload the current drawings and specifications to Groundbook, and state the edition, amendments, and review scope in your instructions. Add the Oregon table of amendments from the Building Codes Division and the 2026 NEC from a copy you are licensed to upload; the free NFPA view the division links is for reading, so check its terms before uploading anything from it. See how Groundbook works with local and licensed codes.
Compare the electrical general notes, one-line diagram, panel schedules, power and lighting plans, electrical site plan, equipment schedules, and specifications. Flag NEC or OESC editions other than the 2026 OESC, notes that rely on an NEC provision Oregon’s amendment table changes, service disconnects that differ between sheets, and generators or alternate sources without matching transfer equipment. Use the supplied 2026 NEC and Oregon amendment table and cite both sources.
Groundbook links each potential finding to the sheets and documents involved. It reads the amendment table and the NEC you supply side by side; it does not calculate loads, fault current, or voltage drop.
Document review does not approve an electrical permit or replace the electrical designer, the licensed electrical contractor, or the electrical inspector.