Machinery law, standards and conformity

An engineer can design an excellent safety system and still put a robot into service illegally, because machinery is governed by a web of laws, regulations, standards and approval schemes that differ by country, province or state and by whether the machine is used at work or sold to consumers. This lesson maps that web for robots used in Canada and the United States and explains the European Union's approach, which matters because many robots are made in or exported to Europe and because EU rules often shape international standards. The key ideas are who has the legal duty, what makes a standard binding, how conformity is shown and what happens when a machine is modified. ROB-440 lesson 8 summarized the main robot safety standards; here the focus is on the legal machinery around them.

How law and standards fit together

Statutes passed by legislatures set general duties and create regulators. Regulations made under statutes set specific rules, sometimes by incorporating standards by reference. Standards are documents produced by recognized bodies through a consensus process; on their own they are voluntary, but they become binding when a regulation incorporates them, when a contract requires them, or in practice when inspectors and courts treat them as evidence of what a reasonable employer or manufacturer would do. Guidance documents from regulators explain how they interpret the law. A professional must know which layer a requirement comes from, because the consequences of not meeting it differ.

In Canada, workplace safety is mainly provincial and territorial. Each jurisdiction has an occupational health and safety act, regulations and an enforcement agency, such as the Ministry of Labour, Immigration, Training and Skills Development in Ontario, CNESST in Quebec, WorkSafeBC in British Columbia and Alberta OHS. Federally regulated workplaces, such as interprovincial transport, banks, telecommunications and federal government operations, fall under Part II of the Canada Labour Code and the Canada Occupational Health and Safety Regulations. Machine guarding rules exist in every jurisdiction and generally require guards or protective devices that prevent access to hazardous moving parts, with lockout before maintenance. Several jurisdictions refer to CSA standards in their regulations, and inspectors routinely cite CSA Z432, Safeguarding of machinery, CSA Z434, Industrial robots and robot systems, and CSA Z460, Control of hazardous energy, as the expected practice.

Workplace duties for robot installations

Workplace law puts the main legal duty on the employer, but it also places duties on suppliers, owners and workers. The practical requirements for a robot installation are broadly similar across jurisdictions: assess hazards, guard dangerous parts, control hazardous energy during maintenance, train and supervise, keep records and report serious incidents.

Ontario offers a distinctive example. Section 7 of the Regulation for Industrial Establishments (R.R.O. 1990, Reg. 851) requires a pre-start health and safety review (PSR) in specified situations before an apparatus, structure or protective element is put into service, constructed or modified. One situation listed in the regulation concerns protective elements such as safeguarding devices that signal the apparatus to stop, including light curtains and similar presence-sensing devices, used in place of a physical barrier. A PSR is a written report, normally by a professional engineer, that identifies the relevant provisions of the regulation and states the measures taken to comply. Robot cells that rely on light curtains or scanners instead of fixed guards may therefore need a PSR, and employers commonly commission one for new robot cells as a matter of course. The details and exemptions are set out in the regulation, which should be read directly.

Workers have duties too: to use safeguards, report hazards and not remove or defeat protective devices. Defeating interlocks, by taping switches or using spare actuators, is a persistent cause of robot injuries. Good design reduces the motivation to defeat safeguards, for example by providing safe ways to clear jams and observe processes, and both ISO 14119 and the type-C robot standards require designers to consider the incentive to defeat interlocks.

Product requirements: approval and certification

Separately from workplace duties, products must meet requirements before they are sold or installed. For robots used at work, the most important of these concern electrical safety.

In Canada, provincial electrical safety laws, based on the Canadian Electrical Code, Part I, require electrical equipment to be approved before it is sold, displayed or connected, which normally means certified by a certification body accredited by the Standards Council of Canada, such as CSA Group, UL Solutions or Intertek, to the applicable CSA C22.2 product standards. Industrial machinery, including robot cells, can be certified as a whole or evaluated on site under a field evaluation program following CSA SPE-1000, the model code for field evaluation of electrical equipment. Uncertified imported machines are a common problem, and an electrical inspector can refuse to allow them to be energized. Consumer robots are subject to the Canada Consumer Product Safety Act, which prohibits manufacturing, importing, advertising or selling consumer products that are a danger to human health or safety and requires incident reporting, discussed in lesson 8.

Neither Canada nor the United States has a general legal requirement that machinery carry a conformity mark showing compliance with safety standards, comparable to European CE marking. Compliance with robot safety standards is demonstrated through the documentation that customers, inspectors and courts expect: risk assessments, validation reports, declarations by the integrator, certificates for components, and manuals. Many buyers make conformity to CSA Z434 or ANSI/A3 R15.06 a contract requirement, which turns the standard into a legal obligation between the parties.

The European approach

The European Union regulates machinery through product law that applies before a machine is placed on the market. The Machinery Directive 2006/42/EC has governed machinery since 2009. It is being replaced by the Machinery Regulation (EU) 2023/1230, which applies from 20 January 2027 and, as a regulation, applies directly in every member state without national transposition. Manufacturers, including any company that builds an assembly of machines such as a robot cell, must meet essential health and safety requirements, compile a technical file, carry out a conformity assessment procedure, issue an EU declaration of conformity and affix CE marking.

The new regulation contains changes aimed at modern robots. Its essential requirements address autonomous mobile machinery, human-machine interaction including psychological stress, protection against corruption of control systems by malicious third-party action, which links safety to cybersecurity, and machinery whose behaviour evolves after it is placed on the market. Its list of higher-risk categories includes safety components and machinery with embedded systems that have fully or partially self-evolving behaviour using machine learning approaches to ensure safety functions; these require assessment by a notified body unless future harmonized standards provide another route. It allows instructions to be supplied digitally, with a paper copy on request. And it clarifies when a modification, including a software update, is substantial enough to make the modifier the manufacturer. Canadian and American companies exporting robots or robot cells to Europe must follow these rules, and many apply EU-style documentation to all their markets to keep one design.

Modifications, retrofits and used machines

Robots are frequently moved, reprogrammed and given new tools. Each change can alter hazards, and the law treats modification as a point where duties revive. A risk assessment review under management of change should ask whether the modification introduces new hazards, increases risk, or changes the performance required of safety functions. In Europe, a substantial modification makes the modifier responsible as a manufacturer, with a full conformity assessment for the affected parts. In Canada and the United States, the duty to provide a safe workplace continues, and in Ontario a modification may trigger a new pre-start health and safety review where the regulation requires it.

Used robots raise similar issues. A second-hand robot may have been built to an older edition of the standards, may have lost documentation, and may have safety functions disabled or changed by its previous owner. Buyers should obtain the manufacturer's manuals, check the controller's safety configuration and its checksum, and treat the integration as a new installation needing a full risk assessment. Older robots often lack modern safety-rated monitoring, which may require additional external safeguards to reach the current level of protection.