Lock It Down! Hazardous Energy Control (LOTO)

Yes - hazardous energy control is a legal obligation in all 13 Canadian jurisdictions, not just a best practice. Federally regulated workplaces (transport, banking, telecoms) must comply with the Canada Labour Code, Part II and COHSR Parts XIII and XIV, which specifically mandate written lockout procedures. All provinces and territories have equivalent requirements under their own OHS Acts. CSA Z460 - Control of Hazardous Energy - sets the national technical benchmark that Canadian LOTO programs must meet. Non-compliance can result in stop-work orders, fines, and criminal liability under Bill C-45 amendments to the Criminal Code if an injury results.

The CSA Z460 Gold Standard follows this sequence: (1) Prepare - obtain the machine-specific energy control procedure and gather devices; (2) Notify all affected workers the equipment is going out of service; (3) Shut down using the manufacturer's sequence; (4) Isolate every energy source - all disconnect switches, valves, and breakers; (5) Apply your personal padlock and tagout tag to each isolation point; (6) Release or restrain stored energy - bleed hydraulic and pneumatic lines, discharge capacitors, block elevated components; (7) Verify zero energy state by attempting to start the equipment using normal controls. CSA Z460 requires Step 7 verification before any work begins, and Step 6 is the step most commonly skipped - stored hydraulic or mechanical energy won't be caught by verification alone.

CSA Z460 and provincial OHS regulations require all seven energy types to be individually identified and controlled: electrical (including capacitor charge that persists after power is cut), mechanical (springs, flywheels, and suspended components), hydraulic (pressurized fluid in cylinders and lines), pneumatic (compressed air and gas that remains pressurized after shutdown), chemical (reactive residues in tanks and pipes), thermal (steam, heated dies, or cryogenic equipment), and gravitational potential energy (any raised or suspended load). Each energy source must be listed in a machine-specific written procedure. Gravity-related failures cause a significant share of LOTO fatalities every year - workers are killed working under unsupported raised equipment that a blocking step would have secured.

No - under COHSR Part XIV, only the authorized employee who applied a lock may remove it. Removing another worker's personal lock is a serious violation under federal and provincial OHS legislation. The only exception is an emergency removal procedure, which must be documented in the employer's written hazardous energy control program and followed exactly. Employers are required to supply LOTO devices and enforce the program consistently, and workers are required to report any situation where equipment deficiencies or unauthorized lock removal occur. The individual-lock rule is what makes LOTO protective - it guarantees that no one can re-energize equipment while another worker is still on it.

A narrow set of tasks may qualify for alternative protective measures instead of full LOTO, but only when all four conditions are met: the task is routine, repetitive, and integral to normal production; no guard is removed or bypassed; the worker does not enter the danger zone; and an effective engineered safeguard such as interlocked guards, light curtains, or two-hand controls is in place. CSA Z460 Section 6 covers these exceptions, and employers must document which specific tasks qualify and what the alternative measures are. If there is any doubt, apply full LOTO - machine jams and unjamming tasks always require full lockout, regardless of how quickly the line needs to restart.