Confined spaces: Reminder on key changes CSA Z1006-16

by Oct 24, 2018Confined spaces

Confined spaces: Reminder on key changes CSA Z1006-16


The latest version of the CSA Z1006-16 standard that provides framework for the management of work in confined spaces includes the addition of many flowcharts, tables and most importantly 3 informative annexes.

Below is an overview of what is offered by the standard’s new annexes:


Annex C:

Confined space atmospheric testing and monitoring

Annex C looks into personal and portable atmospheric monitoring equipment (4 gas detector) used for work in confined spaces. The annex contains the following information:

  • How can atmospheric hazards vary according to the nature of the work?
  • What do the different abnormally too high or too low oxygen readings mean?
  • How should a competent person, having done the assessment of possible risks, choose the piece or pieces of equipment for atmospheric monitoring?
    • Figure C1 offers all the types of sensors according to the atmospheric hazards that are potentially present in the confined space, as well as recommendations for the methods used to verify them.
  • What are the different equipment verification methods?
  • How should the points of atmospheric testing be sampled and at what frequency?
  • What do we need to know about alarm values on an equipment and what are the limits of the equipment used to collect air samples?


Annex D:

Rescue planning

Annex D allows for better understanding when the time comes in your confined space management process to draft appropriate rescue measures. A flowchart for rescue planning is available in figure D1.

This annex also offers a table called ‘’ Cadre régissant le plan de sauvetage en espace clos.’’This figure provides a good lead in the elements to be provided for in the rescue plan. It includes, among others, the following types of rescues:

  • Self-rescue
  • Non-entry rescue
  • Simple entry rescue
  • Complex entry rescue

Furthermore, it includes information on the duration of suggested interventions, the impact of entry dimensions on the choice of rescue equipment, adjustment of rescue equipment and rescue methods in certain conditions considered complex.


Annex E:

Confined space ventilation

In this annex, the different types of ventilation that can be used during confined space work are discussed. The following topics are elaborated on:

  • The elements to consider in the selection of a ventilator or blower. Figures E1 and E2 give examples of axial and centrifugal blowers.
  • Table E1 compares the means of mechanical ventilation that were brought up.

This annex also addresses ducts and accessories that can be added to the chosen system. The last section offers considerable amounts of information on dilution ventilation (forced-air make-up and exhausts).

In short, the changes brought to CSA Z1006-16 offer more information and details that further make the standard an essential reference tool.


If you have needs regarding the management of your confined spaces and their associated rescue plans in your business, our team of professionals will be happy to answer your questions and help guide you.

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Intervention Prévention concentrates its operations in the field of work safety, offering specialized services following Standards CSA Z462 – Workplace Electrical Safety, CSA Z460 – Control of Hazardous Energy: Lock-out and Other Methods, and CSA Z432 – Safeguarding of Machinery.


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