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Assessment Units

Assessment Units

The scheme is separated into 11 units of competence (with some prerequisite units). This provides the candidate with some flexibility to tailor their own competence qualification to the units of competence that reflect their job role. Furthermore, these units can also be tailored to the specific methods of protection a candidate is skilled in. Below is a brief summary of the Assessment Units. More information can be found in the IECEx OD Publication IECEx OD 504.

Unit Ex000 – Basic Knowledge & Awareness to enter a site which includes a classified Hazardous Area

This unit of knowledge covers the safety obligation of person(s) entering a site that has classified hazardous areas.  It requires an understanding of the nature of hazardous areas, limitations on devices that may be taken into a hazardous area and the occupational health and safety responsibilities and procedures related to hazardous areas.  This unit does not include requirements for ensuring the explosion protection aspect of plant and machinery.

Scope limitation(s): None applicable.

Prerequisites: None.

 

Unit Ex001 – Apply basic principles of protection in explosive atmospheres

This Unit covers the explosion-protection aspects of plant and machinery operation or maintenance. It requires the ability to visually identify any damage or deterioration of explosion-protected equipment, monitor equipment and plant in relation to changes in the explosion hazard and to follow procedures to limit the risk of an explosion. This unit of competency is based on various parts of IEC 60079 series and any other relevant ISO/IEC standards that apply to this Unit of Competency.

Scope limitation(s): None applicable.

Prerequisites: None.

Unit Ex002 – Perform classification of hazardous areas

This Unit covers knowledge and skills to classify areas where explosive materials may exist. It requires the ability to gather and analyse data relative to explosion hazards, determine the extent of risk and establish and document zones. This unit of competency is based on IEC 60079-10-1 and IEC 61241-10 and any other relevant standard that apply to this Unit of Competency.

Scope limitation(s): Competency shall be demonstrated in relation to any hazardous areas in which the classification cannot be directly identified by common situations or specific examples. Any scope limitations shall be included in the application according to OD 502.

Prerequisites: Competency in this unit is likely to require a degree or diploma or equivalent. The area classification should be carried out by those who understand the relevance and significance of properties of flammable materials and those who are familiar with the process and the equipment along with safety, electrical, mechanical and other qualified engineering personnel.

Unit Ex003 – Install explosion-protected equipment and wiring systems

This Unit of Competency covers the explosion-protection aspects for installing explosion protected and associated equipment and wiring systems. It requires the ability to match equipment with that specified for a given location, work safely, and to installation Standards and complete the necessary installation documentation. This unit of competency is based on IEC 60079-14 and any other relevant standard that apply to this Unit of Competency. For installation all types of protection must be understood

Scope limitation(s): Competency shall be demonstrated in relation to any classified hazardous area and explosion-protection technique. Any scope limitations shall be included in the application according to OD 502.

Prerequisites: The applicant shall have the level of technical education (or equivalent) attained, relevant to the application, through documents such as College Certificates and Vocational qualifications etc. A minimum 3 years experience in industrial electrical installation practice is required. Competence in this unit shall be assessed either concurrently with or after Unit Ex 001 – Apply basic principles of protection in explosive atmospheres.

 

Unit Ex004 – Maintain equipment in explosive atmospheres

This Unit of Competency covers the explosion-protection aspects for maintaining explosion protected and associated equipment and wiring systems including plant maintenance schemes. It requires the ability to develop and manage maintenance programs incorporating strategies for inspections, repair/overhaul/replacement of components and recording of maintenance outcomes. This includes the ability to follow a maintenance program, work safely, carry out maintenance to Standards and manufacturer’s instructions and complete the
necessary maintenance documentation. This unit of competency is based on IEC 60079-17 and any other relevant standards that apply to this Unit of Competency.

Scope limitation(s): Competency shall be demonstrated in relation to any classified hazardous area and explosion-protection technique. Any scope limitations shall be included in the application according to OD 502.

Prerequisites: The applicant shall have the level of technical education (or equivalent) attained, relevant to the application, through documents such as College Certificates and Trade Credentials etc. A minimum 3 years experience in industrial maintenance practice is required.

NOTE 1 – This experience can include time spent under general supervision.

Competence in this unit shall be assessed either concurrently with or after Unit Ex 001 – Apply basic principles of protection in explosive atmospheres and competencies in maintenance of general plant and equipment, have been achieved (see Annex A). In addition, if the scope limitation requires, the achievement of competencies in developing and managing general electrical/instrumentation maintenance programs will satisfy the prerequisite.

NOTE 2 – For work on wiring and equipment operating above 1000 V a.c. or 1500 V d.c. competency in high voltage switching and safe isolation should be held.

 

Unit Ex005 – Overhaul and repair of explosion-protected equipment

This Unit of Competency covers the explosion-protection aspects of overhauling and repairing explosion-protected equipment both at a craftsperson (operative) level and as the responsible person for verifying compliance after such overhaul and/or repair. For the operative it requires the ability to identify and select authorized components, follow repair specifications to effect the overhaul/repair of equipment and complete repair documentation. For the Responsible Person it requires the ability to establish and document the level of work required, arranging for the overhaul/repair to be carried out, verify compliance of overhauled/repaired equipment and complete the necessary documentation. This unit of competency is based on IEC 60079-19 and any other relevant standards that may apply.

Scope limitation(s):

Competency shall be demonstrated in relation to any classified hazardous area and explosion-protection techniques. The scope limitations will clearly state the Unit of Competency applies for either an Operative or a Responsible person. Any other scope limitations shall be included in the application according to OD 502.

Prerequisites: The applicant shall have the level of technical education (or equivalent) attained, relevant to the application, through documents such as College Certificates and Trade Credentials etc. For an operative a minimum 3 years experience in the overhaul and repair of general electrical, electronic and/or mechanical equipment relevant to the scope of the unit of competency being applied for taking into account the scope limitations. For a responsible person a minimum 3 years experience in the servicing of Ex electrical, electronic and/or mechanical equipment relevant to the scope of the unit of competency being applied for taking into account the scope limitations.

Competence in this unit shall be assessed either concurrently with or after Unit Ex 001 – Apply basic principles of protection in explosive atmospheres and competencies in the overhaul and repair of general electrical, electronic and/or mechanical equipment have been achieved.

 

Unit Ex006 – Test electrical installations in or associated with explosive atmospheres

This Unit of Competency covers testing electrical installations for explosive atmospheres. It requires the ability to select, prepare and use appropriate testing devices, work safely and to Standards and to interpret and record test results. This unit of competency is based on IEC 60079-14 and any other relevant standards that may apply.

Scope limitation(s): Competency shall be demonstrated in relation to any classified hazardous area and explosion-protection technique. Any scope limitations shall be included in the application according to OD 502.

Prerequisites: The applicant shall have the level of technical education (or equivalent) attained, relevant to the application, through documents such as College Certificates and Trade Credentials etc. A minimum 3 years experience in industrial electrical installation practice is required. Competence in this unit shall be assessed either concurrently with or after Unit Ex 001 – Apply basic principles of protection in explosive atmospheres and conducting testing of general electrical, electronic, instrumentation and/or data communication installations have been achieved.

NOTE 1 –  For work on wiring and equipment operating above 1000 V a.c. or 1500 V d.c. competency in high voltage switching and safe isolation should be held.

 

Unit Ex007 – Perform visual & close inspection of electrical installations in or associated with explosive atmospheres

This Unit of Competency covers evaluating the completeness of a hazardous area verification dossier and compliance of the explosion-protected aspects of the electrical installations within the constraints of a visual inspection. It requires the ability to work safely in a hazardous area, evaluate a verification dossier, identify explosion-protected equipment with their certification and specified location, visually inspect an installation for compliance and report and act on inspection results. This unit of competency is based on IEC 60079-14 & IEC 60079-17 and any other relevant standards that may apply.

Scope limitation(s): Competency shall be demonstrated in relation to any classified hazardous area and explosion-protection technique. Any scope limitations shall be included in the application according to OD 502.

Prerequisites: The applicant shall have the level of technical education (or equivalent) attained, relevant to the application, through documents such as College Certificates and Trade Credentials etc. A minimum 3 years experience in industrial electrical installation practice. Competence in this unit shall be assessed either concurrently with or after units Unit Ex 003 – Install explosion-protected equipment and wiring systems or Unit Ex 004 – Maintain equipment in explosive atmospheres have been achieved. Alternatively, competencies in general electrical inspection will satisfy the prerequisite.

NOTE 1 –  For work on wiring and equipment operating above 1000 V a.c. or 1500 V d.c. competency in high voltage switching and safe isolation should be held.

Unit Ex008 – Perform Detailed Inspection of electrical installations in or associated with explosive atmospheres

This Unit of Competency covers the explosion-protection aspects of conducting initial, periodic and sample audit inspections of explosion-protected equipment and installations. It requires the ability to audit a verification dossier, work safely in a hazardous area, inspect against Standards and report and act on inspection results. This unit of competency is based on IEC 60079-14 & IEC 60079-17 and any other relevant standards that may apply.

Scope limitation(s): Competency shall be demonstrated in relation to any classified hazardous area and explosion-protection technique. Any scope limitations shall be included in the application according to OD 502.

Prerequisites: The applicant shall have the level of technical education (or equivalent) attained, relevant to the application, through documents such as College Certificates and Trade Credentials etc. A minimum 3 years experience in general electrical installation practice and a minimum of 2 years experience in Hazardous Area electrical installation practice. Competence in this unit shall be assessed either concurrently with or after competencies in Unit Ex 003 – Install explosion-protected equipment and wiring systems or Unit Ex 004 – Maintain equipment in explosive atmospheres have been achieved. Alternatively, competencies in general electrical inspection will satisfy the prerequisite.

NOTE 1 –  For work on wiring and equipment operating above 1000 V a.c. or 1500 V d.c. competency in high voltage switching and safe isolation should be held.

 

Unit Ex009 – Design electrical installations in or associated with explosive atmospheres

This Unit of Competency covers the explosion-protection aspects of designing electrical power, control and instrumentation systems and installations. It requires the ability to establish design briefs and to pursue economical and effective explosion-protection design solutions. This unit of competency is based on IEC 60079-14 and any other relevant standards that may apply.

Scope limitation(s): Competency shall be demonstrated in relation to any classified hazardous area and explosion-protection technique. Any scope limitations shall be included in the application according to OD 502.

Prerequisites: The applicant shall have the level of technical education (or equivalent) attained, relevant to the application, through documents such as Degree, Diploma and College Certificates etc. A minimum 3 years experience in general electrical installation design or supervised Hazardous Area installation design. Competence in this unit shall be assessed either concurrently with or after Unit Ex 001 – Apply basic principles of protection in explosive atmospheres and competencies have been achieved in designing electrical systems and installations.

 

Unit Ex010 – Perform audit inspection of electrical installations in or associated with explosive atmospheres

This Unit of Competency covers the explosion-protection aspects of conducting an audit of an electrical installation. It requires the ability to verify whether an installation complies with the relevant hazardous area Standards for that installation and includes the verification of design and certification documentation (verification dossier), maintenance, overhaul and repair, work safety, inspection against Standards and reporting of audit results. This unit of competency is based on IEC 60079-14 & IEC 60079-17 and any other relevant standards that may apply.

Scope limitation(s): Competency shall be demonstrated in relation to any classified hazardous area. Any scope limitations shall be included in the application according to OD 502.

Prerequisites: The applicant shall have the level of technical education (or equivalent) attained, relevant to the application, through documents such as Degree, Diploma, College Certificates, Trade Credentials etc. A minimum 3 years experience in general electrical installation or inspection practice, a minimum of 2 years experience in Hazardous Area electrical installation inspection practice. Competence in this unit shall be assessed either concurrently with or after Unit Ex 001 – Apply basic principles of protection in explosive atmospheres and after competencies in engineering auditing or equivalent have been achieved.

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