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6. General Requirements: Guidelines for Multi-Point Suspended Scaffolds (MPSS)

  • ISBN: 0-7794-9927-1
  • Issued: April 2006
  • Content last reviewed: June 2009

These guidelines are being updated to reflect amendments to O. Reg. 213/91 (Construction Projects) that came into force on January 1, 2017.


6.1 Engineering Drawings

In accordance with subsection 142.2(15). the design drawings of the MPSS shall include:

  • a statement by the professional engineer who designs the MPSS indicating that the design meets the requirements of this Regulation;
  • the size and specifications of all components, including the type and grade of all materials to be used (for specific products this may be supplemented by listing the product name, model and size, i.e. beams, trolleys, tensioning devices);
  • the load factors and safety factors for the scaffold and all its components;
  • all the specified loads, including the loads during erection, dismantling, traversing and otherwise moving. Load patterns and location of concentrated loads should also be included;
  • the procedures for erection, dismantling, traversing and otherwise moving.

6.1.1 Additional Considerations For Engineering Drawings

It is recommended that the professional engineer who designs the MPSS show the following requirements on the design drawings:

  • the maximum wind speed as referenced in Part 5.4.3 of the guideline should also be on the drawing;
  • the professional engineer specify the wind load at which work on the MPSS shall stop;
  • movement-limiting devices as referenced in Part 5.4.2 of the guideline;
  • procedures to be followed where the MPSS becomes skewed or jammed during traversing or moving;
  • a checklist of the items including the critical components to be inspected, to assist the competent worker during the inspection of the MPSS;
  • where proprietary components are used for the MPSS, the professional engineer who designs the scaffold must ensure that appropriate testing and certifications of components have been done.

6.2 Specific Duties

The following are specific duties imposed by the Regulation on professional engineers and other workplace parties related to the design, erection, use, moving, traversing, maintenance, and dismantling of MPSS.

6.2.1 Professional Engineer's Duties

In addition to designing the MPSS in accordance with Part 6.1 of the guidelines and the requirements of section 142.2 and subsections 142.3(2),(3),(4) and (5) of the Regulation, the professional engineer shall prepare, sign and seal design drawings of the MPSS.

6.2.2 Constructor's Duties

In addition to the general duties and responsibilities as per section 23 of the Occupational Health and Safety Act, the constructor has additional duties related to MPSS. The constructor must ensure that:

Section 142.2

  • the MPSS is designed by a Professional Engineer
  • the design drawings are signed and sealed by the Professional Engineer
  • the drawings include written procedures for the erection, dismantling and traversing the MPSS
  • any deviations from the drawings are approved by a Professional Engineer in writing
  • the Professional Engineer responsible for the structural integrity of the permanent structure from which an MPSS is suspended provides a written report approving the design loads on the permanent structure by the MPSS

Section 142.3

  • he/she notifies the Ministry of Labour that the MPSS is to be erected or dismantled
  • a Professional Engineer inspects the MPSS after it is erected and before it is first used (including inspection when MPSS is moved to Canada and before it is first used on a project in Ontario), and after it has been moved to a new anchorage
  • that the Professional Engineer provides a written report that the MPSS complies with the drawings subject to any deviations and states whether or not all components are in adequate condition
  • before erecting or dismantling a multi-point suspended scaffold, he/she shall give notice, in person, by telephone, by fax or by electronic means, to the Ministry office located nearest the project.

Section 142.4

  • all written reports and drawings regarding the MPSS be kept at the project

Section 142.8

  • a written record of all inspections is kept at the project, tests, repairs, modifications and maintenance performed on the MPSS while the MPSS is at the project.

6.2.2.1 Additional elements to be considered by Constructor

  • It is recommended that the MPSS be equipped with a wind speed-measuring device and that work be stopped if the wind speed specified in the Professional Engineer's drawing is reached.
  • A copy of the written records of inspection under section 142.8 are maintained with the MPSS when it is moved off site.

6.2.3 Employer's Duties

In addition to the general duties and responsibilities as per sections 25 and 26 of the Occupational Health and Safety Act, the employer has additional duties related to MPSS. The employer must ensure that:

Section 142.2

  • the MPSS is designed by a Professional Engineer
  • the design drawings are signed and sealed by the Professional Engineer
  • the drawings include written procedures for the erection, dismantling and traversing the MPSS
  • any deviations from the drawings are approved by a Professional Engineer in writing

Section 142.3

  • a Professional Engineer inspects the MPSS after it is erected and before it is first used (including inspection when the MPSS is moved to Canada and before it is first used on a project in Ontario), and after it has been moved to a new anchorage position
  • the Professional Engineer provides a written report that the MPSS complies with the drawings and that all components are in adequate condition
  • the MPSS is equipped with a wind speed-measuring device and that work is stopped if the wind speed specified in the Professional Engineer's drawing is reached
  • a competent worker is appointed to inspect the MPSS prior to each day's use and ensure that the inspection is done.

Section 142.5

  • the MPSS is erected, dismantled and traversed by a competent worker under the supervision of a competent person in accordance with all design drawings
  • adequate oral and written instruction is provided to the workers working on the MPSS on the use and limitations of the scaffold
  • adequate oral and written instruction is provided for the workers engaged in the erection, dismantling and traversing of the MPSS
  • the constructor is provided with the drawings, reports and approvals for the MPSS .

Section 142.6

  • the MPSS is not overloaded
  • signs are posted on the MPSS indicating the loading of the platform.

Section 142.7

  • erection, dismantling, traversing or otherwise moving, a worker uses personal fall protection equipment at all times

6.2.3.1 Additional consideration forEmployer

  • It is recommended that the competent worker inspects the MPSS based on a check-list prepared by the design engineer or by the manufacturer.

6.2.4 Worker's Duties

In addition to the general duties and responsibilities as per section 28 of the Occupational Health and Safety Act, R.R.O. 1990, c. O.1, the worker has additional duties related to MPSS:

Section 142.3

  • the competent worker shall inspect the MPSS each day before it is used.

Section 142.5

  • work in accordance with the manufacturer's or Professional Engineer's instruction for the MPSS
  • written instruction is provided to workers on procedures to follow when the MPSS is jammed or skewed.

Section 142.7

  • use appropriate fall arrest equipment while the MPSS is being erected, dismantled or traversed . The workers should use double lanyards or equivalent to ensure 100% protection where needed.

6.2.5 Supervisor's Duties

In addition to the general duties and responsibilities as per section 27 of the Occupational Health and Safety Act, the supervisor has additional duties related to MPSS

Section 142.5

  • under his or her supervision, only a competent worker or workers shall erect, dismantle, traverse or otherwise move an MPSS.

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