This describes the essential skills and knowledge and their level required for this unit

Evidence shall show that knowledge has been acquired of safe working practices and overhauling and repairing explosion protected equipment

All knowledge and skills detailed in this unit should be contextualised to current industry practices and technologies

KSEMA

Explosionprotection equipment overhaul and repair

Evidence shall show an understanding of explosionprotection equipment overhaul and repair to an extent indicated by the following aspects

T Occupational Health and Safety responsibilities related to hazardous areas encompassing

the main features and purpose of a clearance to work system includes hot work permit systems

typical safety procedures that should be followed before entering a hazardous area

the purpose of gas detectors and their limitations

effects of temperature on gas and vapour detection

frequency of monitoring for presence of gas or vapours ie effects of temperature rise

factors affecting the accuracy of gas detectors for example contamination condensation temperature

safety in use of gas detectors for example read and run concept

the safety precautions to be taken when working in a hazardous area

T The roles of the parties involved in the safety of hazardous areas encompassing

common Acts and Regulations related to the safety of hazardous areas and the Authorities responsible for their implementation

where assistance and further information can be obtained to assist persons with hazardous area responsibilities for example Standard bodies experienced consultants and

the hazardous area responsibilities of the owner of premises in which a hazardous area exists the occupier of premises in which a hazardous area exists enterprises and personnel engaged in installation andor maintenance of explosionprotection systems enterprises and personnel engaged in the classification of hazardous areas andor design of explosionprotection systems enterprises and personnel engaged in the overhaul modification andor assessment of explosionprotected equipment enterprises and personnel engaged in the inspection of explosionprotection installations manufacturers of explosionprotected equipment designated authorities insurers

T Properties of combustible substances and their potential to create an explosive hazard encompassing

condition in the workplace that will lead to an explosion

the terms combustion ignition and propagation

explosive range of substances encountered in the workplace ie LELUEL

explosive parameters of substances as given in tables of substance properties

Note Combustible materials are gases vapours from liquids and dusts flash point

the difference between gases and vapours and

the toxic nature of gases and vapours and potential harmful consequences

T The nature of hazardous areas encompassing

the Standards definition of a hazardous area

the recommended methods for classifying the type and degree of explosion hazard in an area

hazardous area classifications as defined by Standards and

factors that are considered when a hazardous area is classified

the basics of how explosionprotection is achieved by the methods of exclusion containment energy limitation dilution avoidance of ignition source

T Explosiveprotected equipment encompassing

The principles of each explosionprotection technique the methods used and how each technique works Flameproof Ex d Increased safety Ex e Nonsparking Ex n Intrinsic safety Ex i and Pressurization Ex p for gas atmospheres and Dustexclusion enclosures Ex tD Pressurization Ex pD Encapsulation Ex mD and Intrinsic safety Ex iD for dusts

How explosionprotected equipment is identified by the Ex symbol marked on the equipment including old equipment and equipment certified in another country

Visible conditions or actions that would void the explosionprotection provided by a particular technique

T Explosionprotection equipment Ex certification schemes encompassing

Purpose and scope of certification schemes

Schemes accepted in Australia and New Zealand

Schemes commonly used in countries other than Australia and New Zealand

Processes for having equipment certified under the acceptable Ex schemes scheme procedures quality management requirements conformance testing and assessment and requirements for ongoing certification

T Flameproof Ex d explosionprotection technique encompassing

The purpose and characteristics of the design features of apparatus and circuits protected by the flameproof Ex d technique Examples of characteristics and design features are flame paths integrity under pressure pressure piling and enclosure entries

Typical situations where the flameproof explosionprotection technique is used

Actions or conditions that would void the protection provided the Flameproof technique

The use of Standards in determining the requirements to which the installation of flameproof explosionprotected apparatus shall comply

T Increased safety Ex e explosionprotection technique encompassing

The purpose and characteristics of the design features of apparatus and circuits protected by the Increased safety Ex e technique Examples of characteristics and design features are temperature rise maximum power dissipation protection devices certified components creepage and clearance distances absence of sparking contacts and enclosure entries

Typical situations where the Increased safety explosionprotection technique is used

Actions or conditions that would void the protection provided the Increased safety technique

The use of Standards in determining the requirements to which the installation of Increased safety explosionprotected apparatus shall comply

T Nonsparking Ex n explosionprotection technique encompassing

The purpose and characteristics of the design features of apparatus and circuits protected by the Nonsparking Ex n technique Examples of characteristics and design features are creepage and clearance distances and restricted breathing

Typical situations where the Nonsparking explosionprotection technique is used

Actions or conditions that would void the protection provided the Nonsparking technique and

The use of Standards in determining the requirements to which the installation of Nonsparking explosionprotected apparatus shall comply

T Intrinsic safety Ex i explosionprotection technique encompassing

The purpose and characteristics of the design features of apparatus and circuits protected by the Intrinsic safety Ex i technique Examples of characteristics and design features are field devices cables safe area devices earthing entity versus integrated system concept simple devices and interface devices and their parameters segregation infallible components current and voltage limiting creepage and clearance distances

Typical situations where the Intrinsic safety explosionprotection technique is used

Actions or conditions that would void the protection provided the Intrinsic safety

The use of Standards in determining the requirements to which the installation of Intrinsic safety explosionprotected apparatus shall comply

T Pressurization Ex p explosionprotection technique encompassing

The purpose and characteristics of the design features of apparatus and circuits protected by the Pressurization Ex p technique Examples of characteristics and design features are exclusion and dilution purge periods controlled shut down monitoring and sources of internal release

Typical situations where the pressurization explosionprotection technique is used

Actions or conditions that would void the protection provided the pressurization technique

The use of Standards in determining the requirements to which the installation of pressurization explosionprotected apparatus shall comply

T Enclosures for dusts Ex tD explosionprotection technique encompassing

The purpose and characteristics of the design features of apparatus and circuits protected by the techniques for dusts Examples of characteristics and design features are for enclosures pressurization encapsulation and intrinsic safety

Typical situations where the each dust explosionprotection technique is used

Actions or conditions that would void the protection provided the each dust technique

The use of Standards in determining the requirements to which the installation of dust explosionprotected apparatus shall comply

T Common characteristics of explosionprotection techniques encompassing

The purposes of temperature classification and gas groupingapparatus grouping

Compliance plate markings

Limitations of nonmetallic or specific alloy enclosures

The purpose of conformity and certificationapproval for equipment used in hazardous areas

Environmental conditions that may impact on explosionprotection techniques

The principles and applications of other and mixed explosionprotection techniques Other techniques include encapsulation Ex m oilimmersion Ex o powderfilling Ex q ventilation Ex v and special protection Ex s

Features and purpose of conduit seals and cable termination devices designed for use in hazardous areas These include conduit seals and barrier and compression glands for cables with or without armouring screening andor drain wires

T The scope and limitations for overhaul and repair of explosionprotected equipment encompassing

the requirements for registration of a workshop

the requirements of a competent person for a registered workshop engaged in the overhaulrepair of explosionprotected equipment and

the scope and limitations of work permitted under workshop registration

T Overhaul and repair technical Standard encompassing

the documentationinformation required to enable overhaulrepair to be undertaken

categories of work for example overhaul no repair overhaulrepair

modifications that are and are not permitted within the equipment certification and

the requirements for overhaulrepair processes relevant to the type of protection and equipment

T Requirements for documentation and identification of overhauledrepaired explosionprotected encompassing

overhaulrepair report document and

requirements for distribution of overhaulrepair reports

T Quality management systems as covered by international Standards encompassing

documentation regime of a quality management system

principle of document and data control covering both internally and externally generated documents and data and

principles of process control as applied to the overhaul and repair of explosionprotected equipment

T The level of overhaulrepair required encompassing

Standards and their use for determining the requirement for a specific explosionprotection technique

measurementtests and equipment required to determine whether an item of equipment meets the certification requirements

requirements for maintaining the accuracycalibration of measuringtest equipment

measurementtest procedures for determining whether an item of equipment meets the certification requirements

level of overhaulrepair required from comparisons of test results and requirements specified in the original certification and

specifying overhaulrepair work required to restore an item of explosionprotected equipment to conform with the original certification

T Measurementtests procedures to verify that an item of equipment meets the original certification requirements

This provides essential advice for assessment of the unit and must be read in conjunction with the performance criteria and the range statement of the unit and the Training Package Assessment Guidelines

The Evidence Guide forms an integral part of this unit It must be used in conjunction with all components parts of this unit and performed in accordance with the Assessment Guidelines of this Training Package

Overview of Assessment

Longitudinal competency development approaches to assessment such as Profiling require data to be reliably gathered in a form that can be consistently interpreted over time This approach is best utilised in Apprenticeship programs and reduces assessment intervention It is the industrypreferred model for apprenticeships However where summative or final assessment is used it is to include the application of the competency in the normal work environment or at a minimum the application of the competency in a realistically simulated work environment It is recognised that in some circumstances assessment in part or full can occur outside the workplace However it must be in accord with industry and regulatory policy

Methods chosen for a particular assessment will be influenced by various factors These include the extent of the assessment the most effective locations for the assessment activities to take place access to physical resources additional safety measures that may be required and the critical nature of the competencies being assessed

The critical safety nature of working with electricity electrical equipment gas or any other hazardous substancematerial carries risk in deeming a person competent Sources of evidence need to be rich in nature to minimise error in judgment

Activities associated with normal everyday work influence decisions about howhow much the data gathered will contribute to its richness Some skills are more critical to safety and operational requirements while the same skills may be more or less frequently practised These points are raised for the assessors to consider when choosing an assessment method and developing assessment instruments Sample assessment instruments are included for Assessors in the Assessment Guidelines of this Training Package

Critical aspects of evidence required to demonstrate competency in this unit

Before the critical aspects of evidence are considered all prerequisites shall be met

Evidence for competence in this unit shall be considered holistically Each element and associated performance criteria must be demonstrated on at least two occasions in accordance with the Assessment Guidelines UEE Evidence shall also comprise

Evidence for competence in this unit shall be considered holistically. Each element and associated performance criteria must be demonstrated on at least two occasions in accordance with the 'Assessment Guidelines - UEE07 '. Evidence shall also comprise:

A representative body of work performance demonstrated within the timeframes typically expected of the discipline work function and industrial environment In particular this shall incorporate evidence that shows a candidate is able to

Implement Occupational Health and Safety workplace procedures and practices including the use of risk control measures as specified in the performance criteria and range statement

Apply sustainable energy principles and practices as specified in the performance criteria and range statement

Demonstrate an understanding of the essential knowledge and associated skills as described in this unit It may be required by some jurisdictions that RTOs provide a percentile graded result for the purpose of regulatory or licensing requirements

Demonstrate an appropriate level of skills enabling employment

Conduct work observing the relevant Anti Discrimination legislation regulations polices and workplace procedures

Demonstrated consistent performance across a representative range of contexts from the prescribed items below

Overhaul and repair explosionprotected equipment as described in and including

A

Following OHS procedures

B

Interpreting certification documentation and Standards

C

Measuring testing and inspecting equipment for compliance with certification and Standards

D

Specifying overhaulrepair work

E

Documenting overhaulrepair work

F

Using quality systems

G

Applying relevant contingency management skills

Context of and specific resources for assessment

This unit should be assessed as it relates to normal work practice using procedures information and resources typical of a workplace This should include

OHS policy and work procedures and instructions

Suitable work environment facilities equipment and materials to undertake actual work as prescribed by this unit

These should also be part of the formal learningassessment environment

Note

Where simulation is considered a suitable strategy for assessment conditions must be authentic and as far as possible reproduce and replicate the workplace and be consistent with the approved industry simulation policy

The resources used for assessment should reflect current industry practices in relation to overhauling and repairing explosion protected equipment

Method of assessment

This unit shall be assessed by methods given in Volume Part Assessment Guidelines

Note

Competent performance with inherent safe working practices is expected in the Industry to which this unit applies This requires assessment in a structured environment primarily intended for learningassessment which incorporates all necessary equipment and facilities for learners to develop and demonstrate the essential knowledge and skills described in this unit

Concurrent assessment and relationship with other units

For optimisation of training and assessment effort competency development in this unit may be arranged concurrently with competence in the overhaul and repair of general lowvoltage or extralowvoltage