ESA Electrical Plan Review in Ontario: 2026 Requirements, Drawings & P.Eng. Roles
An electrical installation can be technically designed, priced and ready to build—yet still be unable to start because mandatory ESA plan review was never identified. This guide helps Ontario owners, contractors and project teams recognize the triggers early and assemble a review-ready package.
When Rule 2-010 applies, ESA states that work may not begin until the required plans have been reviewed.
Effective July 6, 2026, the referenced Section 64 and bidirectional EVSE output trigger increased from 10 kW to more than 12 kW.
ESA's current submission instructions require an unlocked PDF package and a single-line diagram in every plan-review submission.
What ESA Electrical Plan Review Is—and Is Not
The Electrical Safety Authority's plan-review process is an audit of submitted plans and specifications for compliance with the Ontario Electrical Safety Code (OESC). It is intended to identify non-compliant design conditions before equipment is purchased and before installation begins.
That distinction matters commercially. A missing ground-fault protection function, incorrect fire-pump conductor arrangement, uncoordinated generator protection or undersized EV charging service is far less expensive to resolve on a drawing than after switchgear has been released or conductors installed.
ESA also makes clear what its review is not: it does not approve or certify an electrical design, does not replace design by a licensed Professional Engineer where required, and does not replace field inspection. The design professional remains accountable for the engineering within the professional scope.
The review is an OESC compliance audit based on the submitted information. Changes to ratings, equipment, utility conditions or system configuration may affect the reviewed basis and should be coordinated before construction.
When ESA Electrical Plan Review Is Required
Ontario Electrical Safety Code Rule 2-010 and ESA's current guidance identify the installations that must be submitted. The table below is a screening tool, not a substitute for checking the complete current rule and project conditions.
| Installation or system | Current ESA trigger | Early design question |
|---|---|---|
| Three-phase consumer service or standby generation | 400 A or greater | Are the service, generator and transfer arrangements all represented on one coordinated single-line? |
| Single-phase consumer service or standby generation | 600 A or greater | Do calculated loads, service ratings and utility information agree? |
| Feeder | More than 1,000 A | Are conductor ampacity, bus ratings, protection and downstream equipment coordinated? |
| Emergency power for life-safety systems | Section 46 supply, excluding unit equipment | Are life-safety loads, transfer, selective coordination and normal/emergency separation documented? |
| Section 64 or bidirectional EVSE output | More than 12 kW, effective July 6, 2026 | Are source ratings, protection, rapid shutdown or interconnection requirements shown as applicable? |
| EV supply equipment | Except a single dwelling, when total existing plus new EVSE nameplate exceeds 20% of service equipment rating | Is load management included, and does the calculation match the proposed controls? |
| High-voltage installation | More than 750 V, subject to ESA's listed exclusions | Are grounding, protection, equipment ratings and utility requirements developed early? |
Projects can trigger more than one row. A facility expansion, for example, may add a large feeder, modify the service, introduce standby generation and add EV charging. The plan-review strategy should follow the complete system—not only the newest piece of equipment.
If the project begins with a service-capacity concern, see our guides to Load Calculations & Transformer Sizing and Industrial Power Upgrades & Factory Expansion Capacity.
What Changed on July 6, 2026: 10 kW Became 12 kW
An ESA Director's Order effective July 6, 2026 raised the Rule 2-010 plan-review threshold for the referenced Section 64 installations and bidirectional EVSE output from 10 kW to 12 kW. ESA's current wording is more than 12 kW.
This matters because older bulletins, articles, templates and internal checklists may still show 10 kW. A project team relying on an older document can apply the wrong screening threshold. The current ESA plan-review page and effective Director's Order should govern the project decision.
Use the current threshold, but do not treat the threshold as the entire design review. Equipment certification, utility interconnection, OESC compliance, professional design and inspection obligations can still apply even when a particular installation does not trigger plan review.
What a Review-Ready ESA Submission Should Include
ESA requires submissions through its Electronic Plan Review (EPR) Portal. Each civic address is submitted separately, and the plan package must be an unlocked PDF. ESA's submittal form and a single-line diagram are core documents; additional information depends on project type.
Existing and proposed sources, service, transformers, feeders, generators, transfer equipment, major loads, ratings and protective devices.
Load calculations, feeder and conductor sizing, fault-current results, voltage drop and protection studies as applicable to the installation.
Panel, switchboard, transformer, generator, ATS, EVSE, inverter and other project-specific ratings that match the drawings.
Available fault current, interrupting ratings, settings and selective-coordination information where the system or life-safety scope requires it.
Supply voltage, service point, utility fault data, metering and connection requirements relevant to the proposed design.
Signed and sealed engineering drawings or studies where required, including the high-voltage grounding study when applicable and not exempt.
A submission should tell one consistent story. If the single-line says 1,200 A, the load calculation, switchboard schedule and equipment specifications should not say 1,000 A. If a generator feeds life-safety loads, the transfer arrangement and protection shown in each document should agree.
For the broader notification and inspection sequence, see Electrical Permit Process in Ontario. For service and utility interfaces, see Service Entrance Design & Utility Coordination.
ESA, P.Eng., Contractor and Inspector: Different Responsibilities
| Party | Primary role | What the role does not mean |
|---|---|---|
| Professional Engineer | Develops and takes professional responsibility for the electrical design and engineering documents within the agreed scope. | A seal does not replace ESA notification, plan review or inspection. |
| ESA Plan Review | Audits the submitted documents for OESC compliance before work begins when Rule 2-010 applies. | It does not approve or certify the design and does not assume the engineer's design responsibility. |
| Licensed Electrical Contractor | Coordinates notification, installs the work in accordance with applicable requirements and addresses field conditions and defects. | The contractor should not be expected to invent missing engineering decisions during construction. |
| ESA Inspector | Inspects the actual installation and identifies field non-compliance within the inspection process. | Field inspection does not convert an incomplete design package into a coordinated design. |
| Owner / project manager | Provides existing information, confirms scope, manages procurement and holds the team to the approval sequence. | Ordering long-lead equipment early does not waive plan-review requirements. |
Clear responsibility is especially important when an owner hires the engineer and electrical contractor separately. The proposal and drawing package should state who obtains utility information, who submits through EPR, who responds to review comments, and who incorporates accepted changes into construction documents.
For a focused discussion of professional-document triggers, read When Do You Need a P.Eng. Stamp in Ontario?.
Common Problems That Create Plan-Review Comments and Delays
ESA's 2026 contractor guidance highlights recurring issues that plan review can identify before construction: missing ground-fault protection, incorrect fire-pump conductor or protection arrangements, generator ground-fault protection problems, omitted utility-interactive sources, and undersized services for EVSE.
- The single-line omits existing generation, solar, storage or interconnected sources.
- Calculated load, service rating and proposed equipment schedule do not match.
- Available fault current is missing, outdated or inconsistent with equipment interrupting ratings.
- Emergency and life-safety functions are shown without a coordinated transfer and protection strategy.
- EVSE load management is described in notes but not reflected in the calculation or control architecture.
- Equipment substitutions change ratings or protection after the reviewed package is issued.
- High-voltage grounding information is absent or not signed and sealed where required.
- Construction begins while the mandatory review is still outstanding.
Plan the review around the equipment-release date, not the installation date. Switchgear, generators, transformers and EV charging equipment can have long lead times, but early purchase creates risk when the reviewed design is not yet stable.
A Practical Pre-Construction Workflow
- Screen the project. Review the service, generation, feeder, life-safety, EVSE, Section 64 and voltage characteristics against current Rule 2-010 triggers.
- Confirm existing conditions. Gather record drawings, equipment ratings, service information, utility data and field observations. Identify what must be verified.
- Develop the engineering basis. Complete load calculations, system architecture, preliminary equipment ratings, protection approach and discipline coordination.
- Prepare a coordinated package. Align the single-line, calculations, schedules, specifications and professional documents before submission.
- Submit through EPR. Use the current ESA forms, separate civic addresses, unlocked PDFs and project-specific supporting information.
- Close review comments deliberately. Revise all affected documents, not only the marked sheet, and maintain a clear response record.
- Release and construct from the controlled issue. Coordinate procurement, contractor questions, field changes, ESA notification and inspection using the accepted design basis.
What to Send Your Electrical Engineer
A useful first review does not require a perfect package, but it does require enough information to identify gaps and risks. Send:
- Project address, use, scope and target construction date.
- Existing single-line diagram, panel schedules and available record drawings.
- Photos of service, switchgear, transformers, generators and equipment nameplates.
- Utility bills, interval data or demand history when capacity is part of the decision.
- Proposed equipment list with voltage, phase, kW/kVA, full-load current and operating profile.
- Architectural, mechanical and life-safety drawings that affect electrical loads or routing.
- Utility correspondence, available fault-current data and connection requirements already received.
- Procurement dates for long-lead electrical equipment.
ETEM Engineering can use this information to confirm whether plan review is likely triggered, define missing inputs and develop an electrical design package coordinated for ESA review, procurement and construction.
Frequently Asked Questions
What is ESA electrical plan review?
It is an audit of submitted electrical plans and specifications for Ontario Electrical Safety Code compliance. ESA states that the review does not approve or certify a design and does not replace Professional Engineer design responsibility or field inspection.
When is ESA plan review required in Ontario?
Current Rule 2-010 triggers include specified service, generation and feeder ratings; emergency power for life-safety systems; certain Section 64 and bidirectional EVSE installations; specified EVSE projects; and most installations above 750 V. Check the complete current requirements for the actual project.
What changed from 10 kW to 12 kW in July 2026?
Effective July 6, 2026, an ESA Director's Order raised the referenced Rule 2-010 threshold for Section 64 installations and bidirectional EVSE output from 10 kW to 12 kW. ESA's current wording is “more than 12 kW.”
Is a single-line diagram required?
Yes. ESA's current guidance says a single-line diagram is required in every plan-review submission. The package also needs the current submittal form and supporting information for the project type.
Does ESA plan review replace a P.Eng. electrical design?
No. ESA explicitly states that plan review is not a substitute for Professional Engineer design. The engineer remains responsible for the engineering documents within the professional scope.
Can work begin while mandatory plan review is pending?
No. ESA states that work requiring plan review may not begin until the plans have been reviewed. Starting early can create non-compliance, rework and schedule delay.
Does a reviewed plan eliminate ESA field inspection?
No. Plan review and inspection are separate. The installation still follows the applicable notification and inspection process, and field defects may still need correction.
Official Sources
- Electrical Safety Authority — Electrical Plan ReviewCurrent triggers, July 6, 2026 threshold change, EPR submission requirements, single-line requirement and review limitations.
- Electrical Safety Authority — Plan Review Toolbox Talk, February 2026Pre-construction purpose, common non-compliances and the consequences of starting before required review.
- Electrical Safety Authority — Ontario Electrical Safety CodeCurrent OESC edition and the Director's Order associated with the 12 kW threshold.
This article is general information, not legal or project-specific engineering advice. Requirements, interpretations and forms can change. Confirm the current OESC, ESA directions, utility requirements and professional responsibilities for the actual installation.
Planning an Installation That May Trigger ESA Plan Review?
Send ETEM Engineering the existing single-line, proposed loads, equipment ratings, utility information and target construction date. We can screen the plan-review triggers, identify missing inputs, and develop a coordinated electrical package for submission and construction.
Discuss Your ESA Plan Review Project