The 2024 Update to the CSA Z462 Standard on Electrical Safety in the Workplace

Here is the 2024 version of the CSA Z462 standard on electrical safety in the workplace following its separation from its American equivalent, NFPA 70E, updated in September 2024.

What are the main changes in the Z462 standard?

The new 2024 version introduces several changes compared to the 2021 revision. Most of the updates pertain to the following sections: definitions, safe working conditions, added exemptions for energized work permits, the transfer of the table on the likelihood of arc exposure by task to Annex F, the relocation of task tables to Annexes V.2 and V.3, and the replacement of protection categories with a focus on minimum arc protection levels.

Major Changes in the 2024 CSA Z462 Standard

Adjustments to Terms and Definitions

• The definition of arc rating has been revised to include visors and now specifies the “arc rating limit” to reflect the maximum protection available. Previously, “arc rating” referred to the same concept, making this adjustment somewhat puzzling. Additional definition updates have also been made.
• The term leather protection, traditionally used for gloves worn over rubber gloves, has been replaced with protection, allowing alternative materials to leather gloves for protection.

Revision of Electrically Safe Work Condition Limits

• The electrically safe work condition limit has been adjusted in three clauses: 4.1.6.1 to 4.1.6.3. For instance, it now applies to work above 30VAC or 60VDC and when an alternate procedure is required.
• Clause 4.1.6.3 aligns with the Building Code, Chapter 5 – Electricity (Electrical Code) regarding the concept of “not practicable.” However, the Electrical Code focuses on user or occupant safety, not worker safety, which makes this concept variable. Each point must now be validated for the absence of voltage.

Exemptions to Energized Work Permits

• New exemptions have been added for energized work permits, including routine electrical operations that do not require a permit. Other tasks are included, but specifics remain undefined, except for repairs, modifications, or alterations to electrical equipment.
• The absence of voltage is not included, nor are tasks that establish an electrically safe condition, such as work with an open panel without entering the restricted approach boundary. Overall, there are no significant changes compared to the previous application.

Modifications to Tables and Figures in the Standard

• Table 2, which presented the probability of arc generation, has been moved to Annex F and renamed Table F.2. Before the table, the standard now includes a risk assessment process.
• Tables 6A and 6B, detailing Personal Protective Equipment (PPE) requirements by task, have not been eliminated as rumored but relocated to Annexes V.2 and V.3 after Method V.1. Their titles are now Arc Flash PPE Selection Method Tables. A figure has been added to Method V.1 as a guide for use, with additional elements included. However, the figure’s complexity may make its application challenging.

For more details, see our article on incident energy studies.

Updates to PPE and Protection Categories

• Clothing categories have been replaced with minimum arc exposure levels (4 cal/cm², 8 cal/cm², 25 cal/cm², 40 cal/cm², and 75 cal/cm²). This is a welcome change, as the term “category” was not particularly useful.

For further information, check out our article on arc flash PPE.

New Requirements for Re-energizing Protective Devices

• The re-energization of a protective device (e.g., circuit breakers) that has tripped must be performed by a qualified person. This ensures the root cause is identified before re-energizing to prevent a second fault.

Areas Requiring Clarification

• The section on batteries remains unclear, with the minimum level set at 100V (Section 6.2.6), whereas battery systems are typically above 60VDC.
• For high voltage, short-circuit current power is now linked to 1000W. A comparison with the U.S. NFPA 70E standard would be useful, as these values differ from those previously used in battery systems.

Learn More

If you want to know more about electrical safety and the hazards of energized work, consider taking our training course, DANGER : Live work.

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