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    • Ontario Electrical Safety Code (OESC), 28th Edition - 2021
    Codes & Standards - Purchase

    Ontario Electrical Safety Code (OESC), 28th Edition - 2021

    SKU: 2429562 Published by ESA Publication Year 2021 1069 pages

    View Access for this document is only available for viewers in Ontario

    Product Details

    • Overview
    • Preface/Scope
    • Updates

    Overview


    The 28th edition of the Ontario Electrical Safety Code (OESC) includes the 25th edition of the Canadian Electrical Code, Part I, plus Ontario-specific amendments. The OESC is the law in Ontario for electrical installation. This new edition has been updated to enhance electrical safety and better protect electrical workers and the public.


    Highlights and Key Changes:


    • Provided requirements to support reduction in the potential for fires and the loss of animals in buildings housing livestock 


    • Provided clear electrical safety installation requirements for energy storage systems (ESS), harmonized with other codes and standards 


    • Introduced guidance for electrical installations in flood hazard zones and when electrical equipment has been exposed to water to mitigate the potential risks 


    • Requiring GFCI protection for all outdoor receptacles to mitigate the potential for electrical shock hazard 


    • Keeping workers safe by requiring additional receptacles for mobile structures connected to transfer equipment 


    • In Ontario, mitigating the potential for shock or electrocution when structures are erected in close proximity to customer-owned powerlines  


    • In Ontario, keeping reduced conductor sizes for services and feeders for dwelling units by following current installation practices


    Why You Need the New Edition of the Ontario Electrical Safety Code


    Compliance with the requirements of the latest edition of the OESC is the law for anyone performing electrical installations in the province of Ontario. The new OESC is based on the 25th edition of the Canadian Electrical Code, Part I, which is developed through the efforts of a number of volunteer technical committees and subcommittees representing key electrical industry stakeholders and jurisdictions across Canada. 


    Updated every three years in collaboration with safety partners, the 2021 OESC reflects changes in technologies and best practices and helps decrease the risk of injuries and costly re-works of electrical installation projects in Ontario.

    Preface to the 28th edition of the Ontario Electrical Safety Code


    This edition of the Ontario Electrical Safety Code contains the standards referenced by the Ontario Regulation made in 2021 pursuant to the Electricity Act regarding the Ontario Electrical Safety Code. Reference should always be made to the Regulation, and amendments thereto, as may be made from time to time.


    This edition contains electrical safety requirements for wiring and equipment in buildings, structures, and premises, with the exception of mines, railways, aircraft, marine vessels, installations used for communication purposes, and automobiles.


    As electrical hazards occur mainly because of overloading and abuse of wiring systems, it is recommended that initial installations be planned with adequate provision for possible future uses of electricity.


    The 28th edition of the Ontario Electrical Safety Code consists of CSA C22.1:21, Canadian Electrical Code, Part I, and the Ontario Amendments to CSA C22.1:21, Canadian Electrical Code, Part I, dated November 2021.

    An update to this product is available.


    To receive notifications when an amendment, new edition or update is available to your standard no matter how you purchased it, please register on the Standards Update Service. After registering, enter the List ID for the relevant standard. The List ID can be found in the “CSA Standards Update” section within the first few pages of the standard you’ve purchased. Once notified, you can then update your standard accordingly.


    PDF Format Purchased from the CSA Store

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    Paper Format Purchased or Purchased from Reseller

    If you have purchased a paper copy of the standard from the CSA Store or purchased a standard in paper or PDF format from one of our resellers, login to the Standards Update Service to download the updates in PDF format. 


    eBook Format Purchased

    If you have purchased a standard in eBook format, login to the CSA Reader App to download the updated version of the standard. 

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    GST REG No R119441681
    QST REG No R1006017360

    Compare Formats

    Determine the subscription format that is right for you.

    Select the subscription format that is right for you. Table with 13 rows and 3 columns, identifies features available and not available for the two different subscription formats - CSA Advantage TM and CSA OnDemand TM
    Features CSA AdvantageTM CSA OnDemandTM
    Offline access CSA AdvantageTM. feature available. Offline access CSA OnDemandTM. feature available. Offline access
    Full-text search CSA AdvantageTM. feature available. Full-text search CSA OnDemandTM. feature available. Full-text search
    Create highlights and personal notes CSA AdvantageTM. feature available. Create highlights and personal notes CSA OnDemandTM. feature available. Create highlights and personal notes
    Newest editions added automatically CSA AdvantageTM. feature available. Newest editions added automatically CSA OnDemandTM. feature available. Newest editions added automatically
    Includes all supported languages and archive versions CSA AdvantageTM. feature not available. Includes all supported languages and archive versions CSA OnDemandTM. feature available. Includes all supported languages and archive versions
    My Files - create customized files by adding multiple clauses, tables or figures from the standard into your own personal File for quick reference CSA AdvantageTM. feature available. My Files - create customized files by adding multiple clauses, tables or figures from the standard into your own personal File for quick reference CSA OnDemandTM. feature not available. My Files - create customized files by adding multiple clauses, tables or figures from the standard into your own personal File for quick reference
    Toggle between your files and the full standard to maintain context CSA AdvantageTM. feature available. Toggle between your files and the full standard to maintain context CSA OnDemandTM. feature not available. Toggle between your files and the full standard to maintain context
    Instantly preview cross referenced material within the book CSA AdvantageTM. feature available. Instantly preview cross referenced material within the book CSA OnDemandTM. feature not available. Instantly preview cross referenced material within the book
    Export personal notes to Excel CSA AdvantageTM. feature available. Export personal notes to Excel CSA OnDemandTM. feature not available. Export personal notes to Excel
    Transfer notes and highlights when updates are available CSA AdvantageTM. feature available. Transfer notes and highlights when updates are available CSA OnDemandTM. feature not available. Transfer notes and highlights when updates are available
    Adobe Reader PDF and browser compatible for iOS and Android CSA AdvantageTM. feature not available. Adobe Reader PDF and browser compatible for iOS and Android CSA OnDemandTM. feature available. Adobe Reader PDF and browser compatible for iOS and Android
    Web, Android, iOS Compatible CSA AdvantageTM. feature available. Web, Android, iOS Compatible CSA OnDemandTM. feature not available. Web, Android, iOS Compatible
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