Government of Canada / Gouvernement du Canada
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Maritime Occupational Health and Safety Regulations (SOR/2010-120)

Regulations are current to 2021-09-11 and last amended on 2021-07-01. Previous Versions

PART 15Electrical Safety (continued)

Live Test

  •  (1) An employee must not give a guarantee of isolation for the performance of a live test on isolated electrical equipment unless

    • (a) any other guarantee of isolation given in respect of the electrical equipment for any part of the period for which the guarantee of isolation is given is terminated;

    • (b) every person to whom the other guarantee of isolation referred to in paragraph (a) was given has been informed of its termination; and

    • (c) any live test to be performed on the electrical equipment will not be hazardous to the health or safety of the person performing the live test.

  • (2) Every person performing a live test must warn all persons who, during or as a result of the test, are likely to be exposed to a hazard.

Termination of the Guarantee of Isolation

  •  (1) The guarantee of isolation ends when work on, or a live test of, isolated electrical equipment is completed and the following conditions are met:

    • (a) every person in charge

      • (i) has informed the guarantor that the work or live test is completed, and

      • (ii) has made and signed a record containing the date and hour when they informed the guarantor and the name of the guarantor; and

    • (b) on receipt of the information referred to in paragraph (a), the guarantor made and signed a record containing

      • (i) the date and hour when the work or live test was completed, and

      • (ii) the name of the person in charge.

  • (2) The records referred to in subparagraph (1)(a)(ii) and paragraph (1)(b) must be kept by the employer at the employer’s place of business nearest to the work place in which the electrical equipment was located when it was isolated, for a period of one year after the day on which they are signed.

Safety Grounding

  •  (1) An employee must not attach a safety ground to electrical equipment unless they have tested the electrical equipment and have established that it is isolated.

  • (2) Subsection (1) does not apply in respect of electrical equipment that is grounded by means of a grounding switch that is an integral part of the equipment.

  • (3) Work must not be performed on any electrical equipment in an area if the following devices are found unless the device is connected to a common grounding network:

    • (a) a grounding bus;

    • (b) a station grounding network;

    • (c) a neutral conductor;

    • (d) temporary phase grounding; or

    • (e) a metal structure.

  • (4) If, after the connections are made, a safety ground is required to ensure the safety of an employee working on the electrical equipment, the safety ground must be connected to the common grounding network.

  • (5) Every conducting part of a safety ground on isolated electrical equipment must have sufficient current carrying capacity to conduct the maximum current that is likely to be carried on any part of the equipment for the time that is necessary to permit operation of any device that is installed on the electrical equipment so that, in the event of a short circuit or other electrical current overload, the electrical equipment is automatically disconnected from its source of electrical energy.

  • (6) A safety ground must not be attached to or disconnected from isolated electrical equipment except in accordance with the following requirements:

    • (a) the safety ground must, if feasible, be attached to the pole, structure, apparatus or other thing to which the electrical equipment is attached;

    • (b) all isolated conductors, neutral conductors and non-insulated surfaces of the electrical equipment must be short-circuited, electrically bonded together and attached by a safety ground to a point of safety grounding in a manner that establishes equal voltage on all surfaces that can be touched by persons who work on the electrical equipment;

    • (c) the safety ground must be attached by means of mechanical clamps that are tightened securely and are in direct contact with bare metal;

    • (d) the safety ground must be secured so that none of its parts can accidentally make contact with any live electrical equipment;

    • (e) the safety ground must be attached and disconnected using insulated protection equipment and tools;

    • (f) the safety ground must, before it is attached to isolated electrical equipment, be attached to a point of safety grounding; and

    • (g) the safety ground must, before it is disconnected from the point of safety grounding, be removed from the isolated electrical equipment in a manner that the employee avoids contact with all live conductors.

  • (7) For the purposes of subsection (6), a point of safety grounding means a grounding bus, a station grounding network, a neutral conductor, a metal structure or an aerial ground.

PART 16Hot Work Operations


 In this Part, hot work means any work where flame is used or a source of ignition may be produced.


 If hot work is to be performed,

  • (a) a qualified person must be assigned to patrol the working area and the adjoining areas and maintain a fire protection watch of the area for the duration of the work and, if necessary, as determined by the qualified person, for a period of 30 minutes after the work is completed; and

  • (b) a sufficient number of fire extinguishers shall be provided in the working area and the adjoining areas.

 Hot work must not be performed in a working area where

  • (a) flammable gas, vapour or dust may be present in the atmosphere, unless the area has been freed of gas, tested by a marine chemist or other qualified person, and found to be safe for that work to be performed in the area; and

  • (b) an explosive or flammable substance may be present in the working area, unless a marine chemist or other qualified person has ensured that adequate protection exists to permit that work to be safely performed in the area.

  •  (1) Electrical welding equipment cables and gas welding or burning equipment cylinders and pipes must be placed clear of areas used for vehicles unless adequate protection for the cables, cylinders and pipes is provided.

  • (2) Gas cylinders of welding and burning equipment must be placed securely in an upright position when in use.

 Before equipment used for hot work is left unattended, the person in charge of the working area must ensure that the equipment is in a safe condition.

Ventilation Equipment

  • SOR/2019-246, s. 303(F)

 If a hazardous substance may be produced in a work area as a result of hot work

  • (a) the work area must be well ventilated; or

  • (b) any person in the work area must wear a respiratory protective device.

  •  (1) The concentration of any chemical agent to which a person is likely to be exposed in a work area must not be more than

    • (a) the value referred to in subsection 255(1); or

    • (b) the percentage referred to in subsection 255(5).

  • (2) The concentration in a work area of airborne hazardous substances, other than chemical agents, must not be hazardous to the health or safety of the person in the area.

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