LOTO Course page 2 | Industrial & Construction Safety Solutions



Legal Responsibilities

Requirements Under Ontario Regulation 851, Industrial Establishments

42.(1) The power supply to electrical installations, equipment or conductors shall be disconnected, locked out of service and tagged before any work is done, and while it is being done, on or near live exposed parts of the installations, equipment or conductors.

42.(2) Before beginning the work, each worker shall determine if the requirements of subsection (1) have been complied with. 

42.(3) Locking out is not required.

(a) if the conductors are adequately grounded with a visible grounding mechanism; or 

(b) if the voltage is less than 300 volts and there is no locking device for the circuit breakers of fuses and procedures are in place adequate to ensure that the circuit is not inadvertently energized. 

42.(4) If locking is not required for reasons set out in clause (3) 

(a) the employer shall ensure that the procedures required by that clause are carried out

42.(5) If more than one worker is involved in the work referred to in subsection (1), the worker who disconnected and locked out the power supply shall communicate the purpose and status of the disconnecting and lockout.

42.(6) If a tag is used as a means of communication, the tag 

  (a) shall be made of non-conducting material; 

  (b) shall be secured to prevent its inadvertent removal; 

  (c) shall be placed in a conspicuous location; 

  (d) shall state the reason the switch is disconnected and locked out; 

  (e) shall show the name of the worker who disconnected and locked out the switch; and 

  (f) shall show the date on which the switch was disconnected and locked out. 

42.(7) The employer shall establish and implement written procedures for compliance with this section. 

43. Tools and other equipment that are capable of conducting electricity and endangering the safety of any worker shall not be used in such proximity to any live electrical installation or equipment that they might make electrical contact with the live conductor. 

75. A part of a machine, transmission machinery, device or thing, shall be cleaned oiled, adjusted, repaired or have maintenance work performed on it only when, 

(a) motion that may endanger a worker has stopped; and 

(b) any part that has been stopped and that may subsequently move and endanger worker has been blocked to prevent its movement. 

76. Where the starting of a machine, transmission machinery, device or things may endanger the safety of a worker, 

(a) control switches or other controlling mechanisms shall be locked out; and 

(b) other effective precautions taken necessary to prevent any starting shall be taken.

Employer Responsibilities

  • The employer shall provide information, instruction and supervision to workers on proper lockout procedures for each piece of equipment they will be operating. 
  • An initial review should be made to determine which switches, valves, or other energy isolating devices apply to the equipment being locked out. More than one energy source (electrical, mechanical, hydraulic, pneumatic, chemical, thermal, gravitational) may be involved. 
  • The employer should ensure that workers know which energy sources may need to be controlled. Workers should check with a supervisor or other knowledgeable person if in doubt about which energy sources may need to be controlled. 
  • When equipment is to be locked out, employers, supervisors and workers should follow accepted lockout principles, including: 
  • Pre-planning for the lockout by identifying all energy sources, switches, etc. 
  • Where lockout is complex, a written sequence in checklist form should be prepared for equipment access, lockout/tag out, clearance, release and start-up. 
  • All workers affected by the lockout should be notified. 
  • Equipment should be shut down by normal means by turning of switches and closing valves etc. 
  • Equipment should be isolated from energy sources by disconnecting or blocking the sources of energy. 
  • Lockout and tag the energy isolating devices by padlock or some other locking device that the worker has control over as well as a tag indicating that the equipment has been shut down. 
  • Verify that all energy sources have been isolated by attempting to cycle the equipment prior to working on it. 
  • When work is completed, release equipment from lockout. 
  • Test equipment.

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