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3. Definitions: 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.


3.1 Terms Defined in Subsecction 1(1) of the Act and Subsection 1(1) of the Regulation

The following definitions have been extracted from section 1(1) of the Occupational Health and Safety Act, 1990 and Section 1(1) of the Regulations for Construction Projects and are provided below for reference in this guideline:

"multi-point suspended scaffold" (MPSS), means a suspended scaffold or suspended work platform or a system of suspended scaffolds or suspended work platforms, each scaffold or platform being more than 750 millimetres in width, that is supported from an overhead support system by at least three primary load- carrying means of suspension to maintain the system's stability.

"Building Code", means Ontario Regulation 350⁄06 made under the Building Code Act, 1992.

"competent person", means a person who,

  1. (a) is qualified because of knowledge, training and experience to organize the work and its performance,
  2. (b)is familiar with this Act and the regulations that apply to the work, and
  3. (c) has knowledge of any potential or actual danger to health or safety in the workplace;

"competent worker", in relation to specific work, means a worker who,

  1. (a) is qualified because of knowledge, training and experience to perform the work,
  2. (b) is familiar with the Occupational Health and Safety Act and with the provisions of the regulations that apply to the work,
  3. (c) has knowledge of all potential or actual danger to health or safety in the work;

"constructor", means a person who undertakes a project for an owner and includes an owner who undertakes all or part of a project by himself or by more than one employer;

"employer", means a person who employs one or more workers or contracts for the services of one or more workers and includes a contractor or subcontractor who performs work or supplies services and a contractor or subcontractor who undertakes with an owner, constructor, contractor or subcontractor to perform work or supply services;

"professional engineer", means a person who is a professional engineer within the meaning of the Professional Engineers Act;

"Safety factor", means the ratio of the failure load to the specified load or rated load;

"traverse", when used in relation to a multi-point suspended scaffold, means to move the scaffold horizontally, in a controlled manner along the building or structure to which it is attached;

"worker", means a person who performs work or supplies services for monetary compensation but does not include an inmate of a correctional institution or like institution or facility who participates inside the institution or facility in a work project or rehabilitation program.

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