Industrial Establishments Regulation (O. Reg. 851)

R.R.O. 1990, Reg. 851 — the Industrial Establishments regulation made under Ontario’s Occupational Health and Safety Act (OHSA) — is the broad safety regulation for industrial workplaces. It sets out, in detail, what an employer, owner or constructor must do to keep workers safe in a factory, logging operation, or similar industrial workplace: how buildings, surfaces and machines are built and guarded, how power is locked out, what protective equipment workers wear, how air, temperature and hazardous agents are controlled, what welfare facilities are owed, and the extra duties that apply in foundries and logging. This page explains those rules in plain language, keeps every numeric standard, and links each one to the official source.

One idea governs everything below. These are statutory minimums — a floor, not a ceiling. Reg. 851 sets out specific, enforceable baselines, but the OHSA’s overarching general duty still requires an employer to take every precaution reasonable in the circumstances for the protection of a worker. Meeting a numeric standard in this regulation is the start of the safety analysis, not the end of it; a hazard the regulation does not name still has to be controlled. The numbers in this regulation are also durable structural constants rather than annual figures — but where a dimension, threshold or temperature is load-bearing for your operation, confirm the current text at the official source before relying on it.

Who Reg. 851 covers, key terms, and how to vary a requirement

Reg. 851 covers all industrial establishments in Ontario, and an employer, owner or constructor may depart from one of its requirements only if the substitute is at least as protective and proper written notice is given. There is no size threshold and no opt-out by sector — if an operation is an industrial establishment, it is in scope.

The regulation opens with a long list of defined terms, and the definitions do real work — they decide when a particular rule bites. Several are worth knowing:

• “Adequate” carries a two-part test: the thing must be up to the job it was designed for and up to the job it is actually being asked to do — and either way, the bar is whether a worker is genuinely shielded from getting sick or hurt.
• A “flammable liquid” has a precise technical meaning — a flash point below 37.8 degrees Celsius and a vapour pressure (absolute) below 275 kilopascals absolute at that same temperature — so whether a substance triggers the flammable-liquid rules turns on chemistry, not guesswork.
• Terms like “foundry,” “lifting device,” “working space” and “transmission equipment” are each defined, often with carve-outs. A “lifting device,” for instance, excludes equipment covered by Ontario Regulation 209/01 under the Technical Standards and Safety Act.

A required procedure — or the composition, design, size or arrangement of a required material, object, device or thing — may be varied, but only if two conditions are both met. First, the modified approach must afford workers health-and-safety protection at least equal to what the original rule would have provided. Second, written notice of the change must go to the workplace’s health-and-safety committee or representative (if one exists) and to any trade union whose members work there.

A common error is treating a variance as a private engineering call. Skipping the equal-protection analysis, or failing to notify the committee and the union, leaves an employer offside even where the alternative genuinely was a good idea.

Source: Industrial Establishments (R.R.O. 1990, Reg. 851), ss. 1–3.

The statute is the floor, not the ceiling. These are the regulation’s specific, enforceable baselines. The OHSA’s general duty to take every precaution reasonable in the circumstances sits above them, so meeting a numbered rule does not discharge the broader obligation to control a hazard the regulation does not name.

What is the minimum age to work in an industrial establishment?

The Industrial Establishments regulation sets three minimum ages by type of operation: 16 in a logging operation, 15 in a factory (anything that is not logging), and 14 in any other industrial workplace.

These same ages also apply, as a general rule, to anyone who is simply allowed to be in or around the establishment, not just the people on payroll.

There are carve-outs to that second point. The age limit on “being present” does not catch someone who is with an adult, on a guided tour, in a part of the place used for sales, or in an area the public can normally get into — so a customer in a retail section or a parent walking through with staff is not a problem. There is also a special exception for performers: the factory and “other workplace” minimums (the 15 and the 14) do not apply to a worker performing in the entertainment and advertising industry, which the rule defines broadly to include live and recorded performances of theatre, dance, music, skating, comedy, circus, modelling, voice-overs and the like.

A common error is assuming the federal or general working age is the only number that matters, or letting a 14-year-old onto a factory floor where the floor is actually 15. The age turns on what kind of operation it is, so the workplace must be classified correctly before young workers are hired.

Source: Industrial Establishments (R.R.O. 1990, Reg. 851), s. 4.

Buildings: exits, hazardous rooms and fire extinguishers

For most building basics, the regulation defers to the Ontario Building Code, but it adds its own stricter two-exit and two-doorway rules for larger hazardous rooms and carries Fire Code obligations on extinguishers and clear exit routes into the workplace. The Building Code governs how people reach an exit, how they leave a floor area, the structural adequacy of the building, washrooms, service rooms, fire-resistance ratings for separations protecting access to exits and enclosing service rooms or process rooms that hold flammable substances, and the fire-protection rating of closures.

The regulation sets its own definition of a “hazardous room”: a room containing a substance that, because of its chemical nature, the form it takes, or the way it is handled or processed, may explode or ignite readily and create an immediate hazard to the health or safety of workers.

The stricter exit rules apply only when a hazardous room meets either of these thresholds:

• area greater than 15 square metres, or
• any point in the room is more than 4.5 metres of travel from an egress doorway.

When a room triggers either threshold, two requirements stack. First, the floor area it sits in must have at least two exits. Second, the room itself must have at least two egress doorways — and those doorways must be separated from each other by a distance of at least three-quarters of the room’s diagonal. At least one doorway must also be no more than 23 metres of travel from any point inside the room.

Separately, two sets of Fire Code requirements are carried into industrial workplaces: the rules governing fire extinguishers, and the rules requiring egress doorways, public corridors and exits to be kept clear of obstruction. In practice the doorway geometry tends to be set at construction and forgotten — the ongoing compliance risk is keeping corridors and exit routes free from stored material or parked equipment.

Source: Industrial Establishments (R.R.O. 1990, Reg. 851), ss. 120–123.

The statute is the floor, not the ceiling. These are specific minimums. The OHSA’s general duty to take every precaution reasonable in the circumstances still applies, so a fire or egress hazard the numbered rules do not directly address must still be controlled.

Housekeeping, working surfaces and traffic control

Floors and surfaces must be kept clear and non-slip, fixed walkways and stairs meet a minimum width, and warning signs and barriers must be used where doors, machine clearances or traffic could put a worker at risk. A chunk of the regulation is plain good housekeeping written into law.

• Floors and surfaces. Any floor or surface a worker uses has to be kept clear of obstructions, hazards, and built-up refuse, snow or ice. No finish or protective material that is likely to make it slippery may be applied — so the same surface that needs to stay clean cannot be made dangerous by the very product used to treat it.
• Walkways and stairs. A fixed walkway, service stair or stile has to be at least 55 centimetres wide. That is a hard minimum, not a target.
• Machine clearances. The space between a machine’s moving part (or anything it carries) and any other machine, structure or thing has to be big enough that a worker nearby is not put in danger.
• Doors and signs. A door that could be mistaken for an exit, or that opens onto a hazardous, restricted or unsafe area, needs a warning sign posted on it.
• Traffic. Where vehicle or foot traffic could endanger a worker, barriers, warning signs or other safeguards must be used to protect everyone in the area.

A common error is treating these as cosmetic. A cluttered aisle, an unlabelled door beside a real exit, or a forklift route with no barrier is a live safety violation an inspector can write up, not just untidiness.

Source: Industrial Establishments (R.R.O. 1990, Reg. 851), ss. 11–20.

The statute is the floor, not the ceiling. These housekeeping minimums do not exhaust the employer’s obligations. The OHSA general duty requires every reasonable precaution, so a slipping, tripping or traffic hazard the numbered rules do not name still has to be addressed.

Guardrails, floor openings, walkways and ladders

Open edges and floor openings must be guarded, guardrails and ladders are built to set dimensions, and anything elevated that a worker could pass under must be blocked. If a worker can reach an open edge or a gap in the floor, it generally has to be protected.

The regulation requires a guardrail in four situations: at the perimeter of any exposed hole in a floor, roof or other working surface; along the open side of any elevated work surface — mezzanines, balconies, galleries, landings, platforms, walkways, stiles, ramps and raised floors are all named; around the top of a vat, bin or tank whose rim is less than 107 centimetres above whatever lies beneath it (the floor, the ground, an adjacent platform, anything); and around any machine, electrical installation or other thing that poses a danger to workers.

A proper guardrail has a top rail placed between 91 and 107 centimetres above the guarded surface, a mid rail, and a toe-board at least 125 millimetres tall wherever tools or objects might drop onto someone working below. It must be free of splinters and protruding nails, and meet the Building Code’s structural requirements for guards. For a hole in a floor or roof, a secured cover designed to carry Building Code-rated loads is an accepted alternative to a guardrail.

The exceptions are narrow: loading docks, roofs accessed only for maintenance, assembly-line and vehicle-maintenance pits, and certain conveyor systems. But removing the guardrail under one of these exceptions still requires the employer to put other protective measures and procedures in place.

Fixed access ladders must be vertical and have rest platforms no more than nine metres apart. Where a ladder rises more than five metres above grade, floor or landing, it needs a safety cage. Portable ladders must be free of broken or loose parts, have non-slip feet, rest on stable ground, and be braced by a worker when they exceed six metres or face traffic hazards. Where workers need frequent access to equipment above or below floor level, a permanent platform with a fixed stair or ladder is required — a portable ladder will not do.

Two more hazards carry specific rules: a structure damaged badly enough that collapse is a real risk must be braced and shored, or workers must be prevented from entering the area by effective safeguards; and anything temporarily elevated that a worker might pass under must be securely and solidly blocked against falling or shifting.

Source: Industrial Establishments (R.R.O. 1990, Reg. 851), ss. 13–19, 72–74.

The statute is the floor, not the ceiling. These are minimum guarding standards. The OHSA general duty to take every precaution reasonable in the circumstances still governs, so a fall or collapse hazard not squarely covered by these dimensions must still be controlled.

Lighting and flammable liquid storage

Artificial light must be added wherever daylight is not enough to keep workers safe, and flammable liquids must be stored and dispensed in sealed, vented, ignition-free conditions set by the regulation.

Lighting. Where natural light is not enough to keep people safe, artificial lighting must be provided, and shadows and glare must be kept to a minimum. The test is safety, not comfort.

Storing flammable liquids. When they are not needed for immediate use, flammable liquids must sit in sealed containers and be kept somewhere appropriate: outdoors and away from exits, in a building used for nothing else, or in a fire-rated room. That room needs partitions with at least a one-hour fire rating, self-closing doors that swing outward, drainage to a dry sump or holding tank, liquid-tight seals, and natural ventilation through upper and lower wall louvres. Tighter rules apply to opened containers and to the most volatile liquids (flash point below 22.8 degrees Celsius and boiling point below 37.8 degrees Celsius): no source of ignition, and if in a room, explosion venting and a spark-resistant floor.

There is a small-quantity allowance. Up to 235 litres may be kept if it is in sealed containers of 23 litres or less each, or in a double-walled metal cabinet with a three-point door latch and a liquid-tight door sill raised at least 50 millimetres above the floor.

Dispensing. Areas where flammable liquids are dispensed need mechanical floor-level ventilation to the outdoors (18 cubic metres per hour per square metre of floor), and containers and equipment must be bonded and grounded. Portable dispensing containers need a spring-loaded cap and a flame arrestor.

A common error is treating the cabinet allowance as a blanket exemption, or skipping bonding and grounding during pours.

Source: Industrial Establishments (R.R.O. 1990, Reg. 851), ss. 21–23.

The statute is the floor, not the ceiling. These storage and dispensing rules are minimums. The OHSA general duty still requires every reasonable precaution against fire and explosion, so a flammable-material hazard the numbered rules do not name still has to be controlled.

Machine guarding: moving parts, nip points and emergency stops

Any exposed moving part, in-running nip point, or material being processed that could injure a worker must be guarded or shielded, and a power-driven machine must carry an easy-to-reach, conspicuously identified emergency stop. If a machine has a moving part a worker could reach and get hurt on, it has to be guarded — that is the core rule, and it applies broadly.

Guard the danger. Any exposed moving part on a machine, prime mover, or transmission gear that could endanger a worker needs a guard or other device that blocks access. The same goes for an in-running nip or pinch point — the spot where two parts come together and could drag in a hand — where access has to be prevented. A machine also has to be shielded so that product, material being processed, or waste stock cannot injure anyone nearby.

Stops and controls. A power-driven machine’s emergency stop must be conspicuously identified and within easy reach of the operator. If the only thing protecting a worker is the operating control itself, that control must be located where moving machinery will not endanger the operator, arranged so it cannot be tripped accidentally, and never rendered ineffective by a tie-down or any other means.

Specific equipment. The rules get detailed for grinding wheels: they must be marked with their maximum safe speed, fitted with protective hoods covering as much of the wheel as the job permits, and operated only by workers wearing eye protection. The work rest must have no more than three millimetres of clearance from the wheel and must sit above the wheel’s centre line. Beyond grinding wheels:

• Centrifugal extractors, separators, and dryers need interlocking devices that stop the lid from opening while the drum is spinning and prevent start-up while the lid is off.
• Tumbling mills and tumbling dryers need a locking device that stops any movement during loading or unloading.
• Conveyors and other moving machinery whose start-up could endanger workers who are out of sight from the control station must have automatic start-up warning devices.
• Guards must be installed beneath conveyors that pass over workers or from which falling material — including broken conveyor parts — could be a hazard.
• Overhead protection is required wherever falling material could endanger a worker.

A common error is leaving a guard off “just for this run,” or wiring around a control. In practice, an inspector treats a defeated guard as no guard at all.

Source: Industrial Establishments (R.R.O. 1990, Reg. 851), ss. 24–35.

The statute is the floor, not the ceiling. These guarding standards are minimums. The OHSA general duty to take every precaution reasonable in the circumstances still applies, so a machine hazard the numbered rules do not directly address must still be controlled.

Locking out machines before cleaning, repair or maintenance

Before anyone cleans, oils, adjusts, repairs or otherwise services a machine, all motion that could hurt a worker must stop and any stopped part that could later move on its own must be physically blocked; and if restarting the machine could endanger someone, the control switches must be locked out so it cannot be started while the work is going on.

Two things must be true before servicing begins. First, any motion that could hurt a worker has stopped. Second, a stopped part that could later move on its own — something held up only by hydraulics or gravity, for instance — is physically blocked so it cannot drop or swing. Stopping the machine is not enough on its own: if starting it back up could endanger someone, the control switches must also be locked out and any other steps taken to keep it from being started while the work is going on. That is the heart of lockout — the person inside the machine controls whether it can run.

A couple of specific hazards get their own rules:

• Tires on rims. When inflating a tire mounted on a rim, use safety chains, a cage, or comparable protection against a blown-off side ring or lock ring.
• Drums, tanks, pipelines and other containers. Before repairs or alterations, bring internal pressure down to atmospheric before removing any fastening, drain and clean the container so it is free of explosive, flammable or harmful substances, and do not refill while there is any risk of vaporizing or igniting what is going back in. One narrow exception: the pressure and draining requirements do not apply to a pipeline where a competent person carries out hot-tapping and boxing-in under controlled conditions that protect all workers nearby — but the no-refill-while-at-risk rule still applies regardless.

A common error is treating “turned off” as the same as “locked out.” A breaker someone can flip, or an unblocked raised part, is exactly how people get caught.

Source: Industrial Establishments (R.R.O. 1990, Reg. 851), ss. 75–78.

The statute is the floor, not the ceiling. These lockout requirements are minimums. The OHSA general duty still requires every reasonable precaution, so a stored-energy or restart hazard the numbered rules do not name still has to be controlled.

Electrical safety: lockout, live work and ground fault protection

Before anyone works on or near live exposed electrical parts, the power supply must be disconnected, locked out and tagged — with narrow exceptions — conductive tools must be kept clear of live conductors, and equipment must be grounded, certified and protected against ground faults. Before work begins, and throughout the whole job, the power supply has to be disconnected, locked out and tagged, and every worker must independently confirm those steps were done before touching anything.

The two narrow lockout exceptions. Locking out can be skipped only if the conductors are adequately grounded through a visible grounding mechanism, or if the voltage is below 300 volts, the breakers or fuses have no locking device, and written procedures reliably prevent the circuit from being re-energized by accident. When the second exception applies, the employer is responsible for making sure those procedures are actually followed.

Tags and communication. When more than one worker is on the job, the worker who disconnected and locked out must communicate the purpose and status of the lockout to the rest of the crew. A tag serving that purpose must be made of non-conducting material, secured against accidental removal, placed where it is clearly visible, and must identify the worker by name, the date, and the reason the switch is locked out. The whole lockout program must be set out in writing.

Conductive tools near live equipment. Tools or other equipment that can conduct electricity must not be used close enough to any live electrical installation or conductor that accidental electrical contact is possible. This is a separate obligation that exists even when lockout is not required.

When you cannot cut the power. If disconnecting is not practical, live work is permitted instead, but only with rubber gloves, mats, shields and adequate procedures to protect against shock and burns. When voltage is at or above 300 volts, a suitably equipped competent person — one who can recognize the hazards and perform rescue operations including artificial respiration — must be present and able to see the worker at all times. That standby requirement does not apply to equipment testing and trouble-shooting.

Equipment basics. Electrical gear must be certified by the Canadian Standards Association or the Electrical Safety Authority and must be suitable for its intended use. Entrances to rooms or enclosures with exposed live parts must post a conspicuous sign warning of the danger and prohibiting entry by unauthorized persons. Cord-connected tools must have a grounded casing, unless adequately double-insulated with no cracks or defects in the insulation. Portable tools used outdoors or in wet locations need a ground fault circuit interrupter installed at the receptacle or at the panel. Any ground fault that poses a hazard must be investigated and cleared without delay.

A common error is treating low voltage as a free pass, keeping lockout procedures verbal rather than written, or forgetting that conductive-tool clearance applies around live equipment regardless of lockout status. Work on electrical transmission or outdoor distribution systems rated above 750 volts is governed by the separate Electrical Utility Safety Rules document, not these provisions.

Source: Industrial Establishments (R.R.O. 1990, Reg. 851), ss. 40–44.2.

The statute is the floor, not the ceiling. These electrical-safety rules are minimums. The OHSA general duty to take every precaution reasonable in the circumstances still applies, so an electrical hazard the numbered rules do not directly address must still be controlled.

Powder-actuated tools, nail guns and chain saws

Explosive actuated fastening tools, hand-held nailing guns and chain saws carry strict design, guarding, handling and operator rules, because some powered hand tools carry enough force to kill.

Explosive actuated fastening tools (powder-actuated tools). The firing mechanism must stop the tool firing while it is being loaded, while it is being readied, or if it is dropped. It should fire only when pressed against the work surface with real force — at least 22 newtons more than the tool’s own weight — and only after two separate actions, with the firing motion distinct from positioning the tool. If it comes apart for loading, the parts must lock firmly together first. It normally needs a protective guard or shield: suited to the job, mounted square to the barrel, at least 75 millimetres across, and centred on the muzzle (a narrow exception applies when driving a fastener within 38 millimetres of an angled surface). That guard rule is waived for low-velocity tools — where the fastener stays at or below 90 metres per second, measured two metres out, at the strongest load the tool accepts.

Handling rules round it out: store it locked away when idle, never leave it where an untrained person can reach it, never point it at anyone loaded or not, and load it only just before use. Only a worker trained by the maker (or its qualified agent), wearing head and eye protection, who has inspected the tool, may run it — never in an atmosphere with flammable vapours, gases or dust. A misfired cartridge goes straight into a water-filled container until it can be safely disposed of off site. The loads themselves must be clearly marked for strength, kept apart from loads of other strengths, locked up when idle, and kept away from unqualified people.

Hand-held nail guns are simpler: they must fire only when in contact with the work surface, and only a competent person wearing eye protection may use one.

Chain saws must have a low-kickback chain plus a device that stops the chain on kickback, be in safe condition, be held firmly when started and gripped with both hands in use, and have the chain stopped whenever it is not actually cutting.

A common error is treating the powder-actuated tool’s training, locked storage and head-and-eye protection rules as optional, and assuming the guard exception applies when the tool is not actually low-velocity.

Source: Industrial Establishments (R.R.O. 1990, Reg. 851), ss. 36–39.

The statute is the floor, not the ceiling. These powered-tool rules are minimums. The OHSA general duty still requires every reasonable precaution, so a tool hazard the numbered rules do not name still has to be controlled.

Material handling, storage and stacking

Materials must be lifted, moved and stored so they cannot tip, fall or be pulled out in a way that hurts a worker, and certain items — cylindrical loads, drums, gas cylinders and bulk bins — have their own specific stacking and entry rules. The core idea is simple: nobody should get hurt when something is lifted, carried, stacked, or taken back down.

The general rule. Anything that has to be moved must be moved with whatever precautions keep workers safe, which can include protective clothing or guards. Anything stored has to be placed so it will not tip, collapse, or fall, and so a worker can pull it back out safely later. Taking items off a pile or rack counts too: the removal itself cannot put a worker at risk. Separately, any machine, equipment, or material that could tip or fall and endanger someone has to be secured against it.

The specific stacking rules. A few items get their own treatment:

• Round objects stored on their side must be piled evenly, with every unit in the bottom row chocked or wedged so it cannot roll.
• Barrels, drums, or kegs stacked on their ends need two parallel planks laid across each row before the next row goes on.
• Compressed-gas cylinders must be secured in place, kept capped when not in use, protected from damage, have a valve connection that prevents a dangerous gas mix, and — if they hold acetylene — be stored upright.

Entering bulk storage. Any silo, bin, hopper, structure, container, or similar enclosure used for bulk material — as long as it is not a confined space under O. Reg. 632/05 — may only be entered once the material supply is cut off and prevented from resuming, the entering worker is wearing a harness or equivalent gear on a lifeline, and at least one other worker equipped with an alarm stays close by and is capable of giving assistance.

In practice, the rolling drum and the under-chocked pipe stack are where people get caught — the rule is not just “store it,” it is “store it so it cannot move and can come back out safely.”

Source: Industrial Establishments (R.R.O. 1990, Reg. 851), ss. 45–50.

The statute is the floor, not the ceiling. These handling and storage rules are minimums. The OHSA general duty to take every precaution reasonable in the circumstances still applies, so a storage or stacking hazard the numbered rules do not name still has to be controlled.

Lifting devices, cranes and mobile equipment

Lifting devices, cranes and mobile equipment must be sound, marked with their rated load, inspected, and run only by competent operators — and never loaded past their rated capacity.

Lifting devices. A lifting device has to be strong enough and fitted with suitable ropes, chains and slings to keep workers safe. Before it is used the first time, a competent person must examine it to confirm it can handle its rated load, then re-check it as the manufacturer recommends and at least once a year — keeping a signed record. That record is held at least a year, or long enough to keep the two most recent ones. The device must be clearly marked with its maximum rated load. Only a competent person (or a trainee under one) may operate it, no part of a load should pass over a worker, and when a load is raised the controls must be attended — with narrow exceptions for a fixed hydraulic hoist supporting from below and an assembly-line hoist idle during a stoppage.

Hoisting people. A crane or lift truck may lift a worker only on a properly safeguarded platform. If the equipment was not built to hoist people, the load applied has to stay under half the maximum rated load.

Mobile equipment and vehicles. These run only by a competent person (or a supervised trainee). Where the operator cannot see the path of travel or the load, a competent signaller directs them. Unattended vehicles must be immobilized and secured; forks, buckets and blades get lowered or solidly supported.

Loads and lines. Equipment must not be loaded past its rated maximum except for testing. Near live power lines over 750 volts, a minimum clearance must be kept — 3 metres up to 150,000 volts, 4.5 metres to 250,000 volts, and 6 metres above that.

In practice, employers most often get caught on the paperwork: skipped annual examinations and missing signed inspection records.

Source: Industrial Establishments (R.R.O. 1990, Reg. 851), ss. 51–61.

The statute is the floor, not the ceiling. These lifting-device rules are minimums. The OHSA general duty still requires every reasonable precaution, so a rigging, overload or clearance hazard the numbered rules do not name still has to be controlled.

Personal protective equipment: head, eye, foot, skin and fall protection

Workers exposed to a hazard must wear protective gear suited to that hazard, and the employer must instruct and train them on its care and use before they wear it. The regulation takes a hazard-based approach: identify the risk a worker faces, then make sure they have gear that actually addresses it. Before anyone puts on protective clothing, equipment or a device for the first time, the employer must provide instruction and training on how to care for it and use it properly.

The core requirements follow the body part at risk. Workers exposed to a head-injury hazard must wear head protection; the same logic applies to eye-injury and foot-injury hazards. In each case the gear must be appropriate in the circumstances — the regulation leaves product choice open, so the real question is whether it fits the actual hazard.

Skin protection has its own detailed rule. If a worker could be harmed by skin contact with a noxious gas, liquid, fume or dust; a sharp or jagged object that could puncture, cut or abrade; a hot object, hot liquid or molten metal; or radiant heat — then protection is required, either through adequate clothing or a shield, screen or similar barrier.

Entanglement and falls round out the requirements:

• Long hair must be suitably confined to prevent entanglement with any rotating shaft, spindle, gear, belt or other source of entanglement. Loose or dangling clothing, jewellery and rings must not be worn near those same hazards.
• Where the surface a worker could fall to is more than three metres below their position, they must wear a serviceable safety belt or harness and lifeline secured so they cannot fall freely more than 1.5 metres vertically. The fall-arrest system must have capacity to absorb twice the energy and twice the load that circumstances may impose, and must include a shock absorber or equivalent device capping the arresting force at 8.0 kilonewtons.
• Where a worker could fall into liquid deep enough that a life jacket or personal flotation device would be effective against drowning, there must be an alarm system and appropriate rescue equipment. On top of that, either the worker wears a suitable life jacket or flotation device, or the employer develops and implements written measures and procedures to prevent drowning.

A common error is purchasing gear but skipping the training, treating “appropriate in the circumstances” as a rubber stamp rather than matching the protection to the real hazard, or leaving the hot-liquid and entanglement-source categories off the radar.

Source: Industrial Establishments (R.R.O. 1990, Reg. 851), ss. 79–86.

The statute is the floor, not the ceiling. These PPE rules are minimums. The OHSA general duty to take every precaution reasonable in the circumstances still applies, so a hazard requiring protection the numbered body-part rules do not name still has to be addressed — and the hierarchy of controls puts PPE last, after engineering and administrative controls.

Ventilation, replacement air and workplace temperature

An industrial workplace must be ventilated well enough that the air does not put workers’ health or safety at risk, fresh air must replace air that is pulled out, and an enclosed workplace generally has to be kept at no less than 18 degrees Celsius.

Ventilation. The establishment has to be ventilated well enough — by natural means, mechanical means, or both — that the air itself does not endanger anyone’s health or safety. The standard is the result, not the method: clean enough air, however it is achieved.

Replacement air. When air is exhausted out of a space, fresh air has to be brought in to replace it. That replacement air has to be:

• heated when needed, so the workplace can hold the minimum temperature (below);
• free of hazardous dust, vapour, smoke, fume, mist or gas; and
• brought in carefully — so it does not blow settled dust around, fight the exhaust system, or create nasty drafts.

Exhaust also has to discharge in a way that keeps the contaminants from circling back into any workplace.

Temperature. An enclosed workplace must sit at a temperature suitable for the work being done, and as a rule not below 18 degrees Celsius. That 18-degree floor has real exceptions. It does not apply where the space is normally unheated, where doors have to stay open so much that heating it is not practical, where perishable goods need it colder, where radiant heating already keeps workers as comfortable as 18 degrees would, where the work itself means 18 degrees would be uncomfortable, or during the first hour of the main shift when process heat supplies much of the building’s warmth.

A common error is treating 18 degrees as either an unbreakable rule or a meaningless one. It is a default with defined carve-outs — an employer should know which one its operation falls under before turning the thermostat down.

Source: Industrial Establishments (R.R.O. 1990, Reg. 851), ss. 127–129.

The statute is the floor, not the ceiling. These air and temperature rules are minimums. The OHSA general duty still requires every reasonable precaution, so an air-quality, heat-stress or cold-stress hazard the numbered rules do not name still has to be controlled.

Industrial hygiene: hazardous-agent exposure, assessment and training

Workers who may encounter hazardous biological, chemical or physical agents must be trained before exposure, backed by on-site emergency equipment, safe drinking water, and mechanical ventilation wherever atmospheric oxygen falls below 19.5 per cent. The regulation ties industrial hygiene directly to exposure risk: any worker who may encounter a biological, chemical or physical agent that could endanger their safety or health must be trained before the exposure happens. That training has three required components — the precautions and handling procedures for the agent; how to use and look after any personal protective equipment; and how to use the available emergency measures and procedures.

For agents that pose a skin or eye injury risk, the employer must supply whatever emergency treatment equipment is actually needed — which can include eye wash stations, emergency showers, or antidotes and flushing fluids. None of that equipment is useful buried in a cabinet: it must be conspicuously located near the point of hazard, clearly labelled, unobstructed, and have its use instructions posted on or immediately beside it.

Several related housekeeping rules tie the framework together:

• Material removal must be handled in a way that avoids creating a new hazard.
• Food, drink and tobacco are banned from any room, area or place where a substance that is poisonous by ingestion is present or exposed.
• Potable drinking water must be accessible on each floor used for regular work and placed no more than 100 metres from any active work area (the requirement does not apply to logging operations, other than logging camps).
• Where a worker may be exposed to an atmosphere — at normal atmospheric pressure — whose oxygen content drops below 19.5 per cent, mechanical ventilation must be used to protect them. If that is not practicable, air-supplied breathing equipment takes over.

A common error is stocking the eye wash station but skipping the training, or letting the station get blocked, mislabelled, or relocated away from the actual hazard.

Source: Industrial Establishments (R.R.O. 1990, Reg. 851), ss. 124, 126, 130–132, 138.

The statute is the floor, not the ceiling. These hygiene rules are minimums. The OHSA general duty to take every precaution reasonable in the circumstances still applies, and labelling, data-sheet and training duties for hazardous substances are detailed further in the WHMIS and Hazardous Materials requirements, so an exposure hazard the numbered rules do not name still has to be controlled.

Piping labels, explosion hazards and dust control

Hazardous piping must be clearly marked, processes that can throw off explosive gas or dust must be contained or vented, and fine combustible-dust collectors face strict siting rules.

Mark hazardous pipes. Any piping system carrying something dangerous — because it is toxic, at a hazardous temperature (hot or cold), under pressure, flammable, or otherwise risky — has to show what is inside and which way it flows. That identification is needed at valves and fittings, where a pipe runs through a wall or floor, and anywhere the contents or flow direction could be in doubt. There is a narrow carve-out for petro-chemical plants where processing and maintenance are handled by competent people under controlled conditions to protect all workers.

Contain explosive processes. If a process is likely to give off enough gas, vapour, dust or fume to form an explosive mix with air, it must either be burned off safely under controlled conditions, or run in an area that is isolated from other work, well enough ventilated to keep concentrations below hazardous levels, free of ignition sources, set up for explosion venting, and fitted with baffles, chokes or dampers where they apply.

Dust specifics. Where stray foreign particles entering equipment could trigger a dust explosion, the equipment needs separators to keep them out. Collectors handling fine, easily-ignited dust like aluminum or magnesium generally have to sit outdoors or in a dedicated, dust-tight room used solely for dust-collecting equipment — separated from the rest of the building by a partition with at least a one-hour fire-resistance rating, and built to vent any explosion to the outside. Exceptions exist for wet (inert-liquid) collectors, wood-working operations (other than wood flour manufacturing) with a capacity under 0.47 cubic metres per second, and collectors designed to safely contain or resist explosions with effective outdoor venting.

Compressed air. Compressed air or gas must not be used to blow dust off a worker’s clothing unless the device limits any pressure increase when the nozzle is blocked, and it must never be directed in a way that puts anyone at risk.

In practice, the slip-ups are mundane: faded or missing pipe labels, and a dust collector parked indoors because outdoors was inconvenient.

Source: Industrial Establishments (R.R.O. 1990, Reg. 851), ss. 62–66.

The statute is the floor, not the ceiling. These piping and dust rules are minimums. The OHSA general duty still requires every reasonable precaution, so an explosion or contaminant hazard the numbered rules do not name still has to be controlled.

Welfare facilities: showers, lockers, first-aid rooms and lunchrooms

The regulation sets out when an employer must provide proper showers, change lockers, a rest area and a place to eat — with the worker headcounts and hazards that trigger each one. The triggers are mostly about how many workers there are and what they are exposed to.

Showers and water. Any shower provided (emergency ones aside) needs both hot and cold water. The hot water has to be kept in a sensible band — at least 30 degrees Celsius so it is actually warm, and no hotter than 60 degrees Celsius so nobody gets scalded. It also cannot be heated by piping steam straight into the water.

Showers and lockers for dirty work. Where workers handle a substance that is poisonous if swallowed and can get onto the skin, the employer has to go further: provide shower rooms plus separate, individual lockers — one set for street clothes, one for work clothes — so contamination does not ride home.

A rest space. Once an employer has ten or more workers, a room or space is needed that gives reasonable privacy and is equipped with one or more cots and chairs, unless the first-aid station already covers that.

A place to eat. A suitable eating area is required where there are thirty-five or more workers, or where there is anywhere on site with exposure to a substance poisonous by ingestion.

Shared gear. Protective clothing or another safety device that was worn next to the skin must be cleaned and disinfected before the next worker puts it on.

A common error is treating these as optional perks. They are not — they kick in automatically at the headcounts and hazards above, whether or not anyone asks.

Source: Industrial Establishments (R.R.O. 1990, Reg. 851), ss. 133–137.

Foundry safety: molten metal and cupola operations

A foundry carries extra duties for handling molten material and running cupolas, including spillage controls, gangway and pouring-aisle widths, protective clothing, and strict cupola operating rules. They all turn on one hazard: hot metal meeting something it should not, or a worker who cannot get out of the way.

Molten material. Written procedures are needed to prevent molten material from contacting damp, rusty, or cold surfaces, or moisture or water, whenever that contact could put workers at risk. Containers must be examined immediately before each use and taken out of service if defective or contaminated by anything that could react dangerously with the melt. Engineering controls come first to stop spillage; where they are not enough on their own, other measures are added on top — such as protective equipment or removing workers from exposure zones. Those procedures are drafted with the joint health and safety committee or representative.

Getting out. Every location where workers could be near molten material needs adequate egress. A system is also needed for alerting workers to molten-material emergencies. Pits and enclosed working spaces built or altered after May 1, 1995 that drop more than 60 centimetres below the adjacent floor (or are surrounded by a wall that high) have detailed exit requirements: exits must be non-combustible doorways, ramps, or stairs with slip-resistant surfaces. Two exits are required if the space exceeds 15 square metres in area, or if any point inside the space is more than 5 metres from an exit — and no point may be further than 25 metres from one.

Gangways, aisles, gear. Minimum gangway widths for conveying molten metal depend on the type of container and how many workers are involved — tables in ss. 90–92 set out the numbers. Pouring-aisle widths turn on mould height and crew size. Anyone handling molten metal must wear gaiter-type boots with leggings or other protective clothing arranged so the boot tops are covered.

Cupolas. A cupola must have legs and supports shielded from the melt, explosion-vent top doors (if closed-top), and a positive means of stopping combustible gas from building up in the air supply when airflow fails. A continuous open flame or other ignition source must be kept above the charging level while the cupola is running, right up until all combustible material is consumed. Dropping the bottom requires at least a three-minute visual and audible warning, and the props must be released by a winch or similar device operated from behind a wall or shield — not from beside the cupola. Afterwards, coke slag and unmelted metal must be cleared out by mechanical means. Charge material must be free of ice or moisture (unless precautions ensure the reaction will not endanger anyone), enclosed vessels must be broken open before charging, and containers must be dry before use.

A common error is treating these as paperwork. The container check, the dry-charge rule, the ice-and-moisture requirement, and the warning signal are the points inspectors actually test.

Source: Industrial Establishments (R.R.O. 1990, Reg. 851), ss. 87–102.

The statute is the floor, not the ceiling. These foundry rules are minimums. The OHSA general duty to take every precaution reasonable in the circumstances still applies, so a molten-metal or cupola hazard the numbered rules do not name still has to be controlled.

Logging operations: training, felling, skidding and hauling

Logging operations require Ministry-approved training for cutters, skidder operators and machine operators, and strict rules for how trees are felled and how logs are skidded, loaded and hauled. Logging is one of the most tightly governed activities under the regulation, with its own block of rules that even define terms like “hang up”, “chicot” and “spring pole”.

Training comes first. Ministry-approved programs are required for two groups: cutters and skidder operators, and operators of mechanical harvesting equipment. A cutter needs the Cutter-Skidder or Cutter program; a skidder operator the Cutter-Skidder or Skidder program; a machine operator the matching program for their equipment. Supervisors of mechanical harvesting equipment need the Supervisor Training Program before they supervise. Someone not yet trained must be registered for the right program before doing the work, and must finish it within one year of registering. A Ministry document showing registration or completion is conclusive proof.

Felling and the bush. Keep the felling area clear of everyone except authorized workers and inspectors. Before a tree comes down: clear other workers from the danger zone, cut snags and clear them away, lower chicots and spring poles safely to the ground, and make sure the cutter can stand clear of the fall. If a tree will fall alongside or across a road, the road must be blocked off or a signaller posted. A hung-up tree is pulled or winched down from a safe distance, never climbed, never brought down by felling another tree into or onto it, and never freed by cutting the supporting tree.

Moving logs. Skid only when others are clear of the danger area and without raising the log so high the vehicle might tip or the operator be put at risk. Haul vehicles must be loaded and secured so no log extends beyond the stakes or more than half its diameter above them. While a worker is in the cab, the load must not be moved by a method where a boom or part of the load could pass over the cab. Haul roads and bridges need turnouts, warning signs, curbs and width markers.

A common error is treating training as paperwork. An untrained worker can only work if the employer actually registered them first and the one-year clock is running.

Source: Industrial Establishments (R.R.O. 1990, Reg. 851), ss. 103–119.

The statute is the floor, not the ceiling. These logging rules are minimums. The OHSA general duty to take every precaution reasonable in the circumstances still applies, so a felling, skidding or hauling hazard the numbered rules do not name still has to be controlled.

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This page is general information about Ontario occupational health and safety law, not legal advice. Reg. 851 is detailed and its numeric standards and carve-outs matter to the specific layout and operations of a workplace, so confirm the current requirements against the official source and obtain advice for a specific site before acting on any of the above.