When Ontario EHS professionals discuss arc flash compliance, the conversation typically centres on CSA Z462, OHSA fines, and Ministry of Labour inspections. Less commonly discussed — but arguably the most consequential legal exposure — is the criminal liability framework that has applied to workplace safety failures in Canada since 2004. Understanding Bill C-45 and how it applies to electrical safety decisions changes the risk calculus for every employer who is aware of the arc flash hazard and has chosen not to address it.
What Is Bill C-45?
Bill C-45, enacted in 2004, amended the Criminal Code of Canada to address corporate and individual criminal liability for workplace safety failures. The legislation is formally known as the Westray amendments — named after the 1992 Westray Mine disaster in Nova Scotia, where 26 miners were killed in an explosion caused by negligent methane and coal dust management that was known to management and regulators but not addressed.
The Westray amendments established two key mechanisms for criminal liability in workplace safety contexts:
Section 217.1 creates a legal duty for everyone who directs work — directors, senior officers, supervisors, and in some circumstances owners — to take reasonable steps to prevent bodily harm to workers and the public. Breach of this duty, where it results in death or bodily harm, can form the basis of criminal negligence charges.
Section 22.1 establishes organizational criminal liability, allowing corporations and other organizations to be convicted of criminal negligence where a senior officer (defined broadly as someone who plays an important role in establishing the organization’s policies or manages an important aspect of the organization’s activities) is a party to the offence or directs a representative to commit the offence.
The practical result: for the first time in Canadian law, corporations could be convicted of criminal offences — including criminal negligence causing death — for workplace safety failures. And individual senior officers faced personal criminal liability for deaths and serious injuries caused by workplace hazards they were aware of and failed to address.
How Bill C-45 Applies to Arc Flash
The connection between Bill C-45 and arc flash is direct and uncomfortable for employers who are aware of the arc flash hazard at their facilities but have not commissioned arc flash studies.
The elements required for criminal negligence charges under Section 217.1 are:
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The accused directed work — which encompasses any senior officer, plant manager, or supervisor who has authority over the workplace and the workers performing electrical maintenance.
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The accused knew, or ought to have known, of the hazard — arc flash is a well-documented, widely-known workplace hazard. The existence of CSA Z462, OHSA regulations incorporating electrical safety requirements, and publicly available information about arc flash incidents establishes that awareness of the arc flash hazard is reasonable to impute to employers in industries where electrical systems above 50V are present. An employer who has received a Ministry of Labour electrical safety order, or who employs qualified electricians who are aware of arc flash, cannot credibly claim ignorance of the hazard.
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The accused failed to take reasonable steps to prevent harm — an employer who knew of the arc flash hazard, who knew that CSA Z462 required arc flash hazard analysis, and who failed to commission an arc flash study has, on its face, failed to take the reasonable steps to prevent harm that Section 217.1 requires.
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The failure resulted in death or bodily harm — if a worker is killed or seriously injured in an arc flash incident at a facility without a current arc flash study, the causal connection between the failure to conduct the required hazard analysis and the resulting injury is straightforward.
For Greater Sudbury’s mining operations — where Ontario Regulation 854 adds additional layers of electrical safety requirements on top of CSA Z462 — and for Peterborough’s manufacturing facilities with aging electrical infrastructure, where incident energy levels at legacy switchgear can be severe, the Bill C-45 exposure for employers who have knowingly deferred arc flash studies is substantial.
Corporate vs. Individual Liability
A common misconception is that Bill C-45 liability rests with the corporation rather than with individual officers. This is only partially true.
Under Section 22.1, the organization can be convicted of criminal negligence. For a corporation, the consequences include significant fines (there is no statutory maximum for criminal fines on corporations) and the reputational consequences of a criminal conviction, which can affect business licensing, government contracts, and insurance.
But the individual criminal liability under Section 217.1 runs to people — directors, senior officers, plant managers, and supervisors who directed the work and who were aware of the hazard. Unlike OHSA penalties (which are civil/administrative in nature), criminal negligence convictions under the Criminal Code result in criminal records for individuals and carry the possibility of imprisonment.
The individuals most at risk are those who:
- Had authority to direct electrical maintenance work or to commission safety studies
- Were aware (or ought to have been aware) of the arc flash hazard
- Made conscious decisions to defer arc flash study work — whether due to budget constraints, competing priorities, or disagreement with the requirement’s urgency
Senior officers who can demonstrate that they took reasonable steps to commission arc flash studies — even if those steps were ultimately unsuccessful due to provider availability, budget approval processes, or organizational delays — are in a materially better legal position than those who simply never addressed the issue.
The Evidentiary Significance of Arc Flash Studies
Arc flash studies matter in the Bill C-45 context not only for the worker protection they provide, but for the legal protection they provide to the employer.
A completed, current arc flash study is evidence that the employer:
- Was aware of the arc flash hazard (as demonstrated by having commissioned the analysis)
- Took concrete steps to assess and quantify the hazard
- Provided workers with the specific PPE requirements and arc flash boundaries needed to work safely
- Met the technical requirements of CSA Z462
In the event of an arc flash incident at a facility with a current, properly implemented arc flash study, the legal question shifts from whether the employer addressed the hazard to whether the specific incident was the result of worker error, unforeseen equipment failure, or other factors beyond the employer’s reasonable control. This is a substantially more defensible position than the one faced by an employer with no study at all.
Conversely, in the event of an arc flash fatality at a facility where management was aware of the arc flash requirement but had not commissioned a study, the arc flash study’s absence becomes primary evidence in an OHSA prosecution, a civil negligence action, and potentially a criminal negligence investigation.
OHSA Prosecutions and the Arc Flash Study Record
Short of a criminal prosecution under Bill C-45, arc flash-related OHSA prosecutions under Ontario law carry significant consequences for both corporations and individuals. Under Section 66 of the OHSA:
- Corporations face fines of up to $500,000 per offence, with each worker exposed to the hazard potentially constituting a separate offence
- Individual supervisors and managers face fines of up to $100,000 and up to 12 months imprisonment
- Directors and officers of corporations face personal liability for OHSA offences committed by the corporation if they directed, authorized, assented to, or acquiesced in the commission of the offence
In practice, OHSA electrical safety prosecutions following arc flash incidents typically name both the corporation and individual managers in the same proceeding. The absence of an arc flash study is often the central element in the Crown’s case — it demonstrates both the standard that was required and the employer’s failure to meet it.
What “Taking Reasonable Steps” Looks Like in Practice
For Ontario employers who want to demonstrate that they took reasonable steps to address the arc flash hazard — and who therefore want the legal protection that comes with that demonstration — the minimum defensible standard involves:
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Commissioning a current arc flash study from a qualified engineering firm, in accordance with CSA Z462 and IEEE 1584-2018 methodology, with results stamped by a Professional Engineer.
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Implementing the study results — specifically, ensuring that arc flash warning labels are affixed to all electrical equipment and that workers have access to the required PPE before energized electrical work is performed.
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Updating the study on the required five-year cycle and whenever significant electrical system changes are made.
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Training workers who perform energized electrical work in arc flash hazard awareness and PPE requirements specific to their work locations.
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Maintaining records of the study, implementation, and training to demonstrate the program’s currency and completeness.
These steps are not aspirational — they are the minimum that CSA Z462 requires and the minimum that a court or Ministry prosecutor would expect to see demonstrated in the event of an electrical incident.
For Ontario facilities that have not yet commissioned an arc flash study, the starting point is understanding what a study will cost for your specific facility. Our arc flash study guide explains the full scope of what a compliant study involves, and our free cost estimator provides a custom estimate based on your facility type and size in under two minutes.
The investment in an arc flash study is modest compared to the exposure it addresses. The alternative — knowing the requirement exists and choosing not to act — is not a risk management decision. Under Bill C-45, it is a personal liability decision.