Diagnose faults and determine the potential for or the viability of repair in electrical plant, equipment and systems

Business Sectors (Suites): Maintaining Plant and Systems - Electrical
Developed by: ECITB
Approved on: 01 Jun 2020


This standard is about diagnosing and determining the causes of faults in electrical plant,  equipment and systems in engineering construction, and then determining if there is potential to repair the fault and if so, if it is viable to repair it
You will need to complete fault diagnosis and determine the implications of the fault whilst adhering to health, safety and environmental legislation, regulations and safe working practices.
In the context of this standard, your responsibility is to interpret and work within given specifications, selecting methods and techniques to achieve the best possible result.  In some cases, you may still be expected to refer to others for final authorisation, even though you remain responsible for identifying and implementing decisions.
**Who this standard is for**
This standard is for electrical maintenance technicians and those that maintain electrical plant and equipment.

Performance criteria

You must be able to:

1. work safely at all times, complying with health, safety, environmental and other relevant legislation, regulations, guidelines and local rules or procedures 2. ensure that the work environment, material and equipment are suitably prepared for the work activities to be undertaken 3. review and use all relevant information on the symptoms and problems associated with the electrical components, plant, equipment and systems 4. select, use and apply diagnostic techniques, tools and aids to locate faults 5. complete the fault diagnosis as required 6. determine the implications of the fault in relation to: * related equipment * related processes * health and safety * and the escalation process 7. use the evidence from the diagnosis along with consideration of the implications of the fault in order to draw valid conclusions about the nature and probable cause of the fault 8. record details on the extent and location of the faults in an appropriate format 9. determine what work is required to bring the electrical component back to the specified condition, taking into account the level of wear or damage and the conclusions about the nature and probable cause of the fault in order to determine: * the potential for repairing it * the viability of repairing it 10. reinstate the work area 11. deal promptly and effectively with problems within your control and report those that cannot be solved

Knowledge and Understanding

You need to know and understand:

1. relevant legislative, regulatory and local requirements or procedures and safe working practices including your responsibilities with regard to reporting lines and procedures 2. preparation and reinstatement requirements in respect of the work area, material, and equipment, and the possible consequences of incorrect actions in these area 3. the main techniques for fault finding and the equipment used  4. the logical process of fault diagnosis and the principles and uses of diagnostic aids 5. how to interpret the information and fault found and the: * likely root cause(s) * the potential consequences associated with it 6. how to determine if it is feasible to repair the electrical component(s), equipment or system 7. procedures for  recording the fault and related diagnosis 


**Work environment**
This could include:
* engineering construction sites * controlled operations * offshore installations * maintenance sites * nuclear sites * repair sites
Work environments may be open or restricted spaces:  
* at height  * confined spaces * control rooms * controlled operational and offshore installations * designated work areas * explosive atmospheres * existing plants and structures * fabrication workshops  * in plant rooms * inside structures, system and plant * on access structures (scaffold) * on open structures * onshore and offshore installations * potential explosive atmospheres * shafts * shipyards * tunnels
**Reinstate the work area**
This term could include:
* returning the work area to a safe condition * removing barriers * sweeping up * correctly disposing of waste materials * storing re-usable materials, consumables and equipment in accordance with appropriate procedures * completing  all necessary documentation

Scope Performance

Scope Knowledge





Links To Other NOS

External Links

Version Number


Indicative Review Date

01 Jun 2024





Originating Organisation


Original URN


Relevant Occupations

Electrical Maintenance Technician

SOC Code



electrical; maintenance; fault; diagnosis; test; engineering; construction; engineering construction; viability of repair; feasibility of repair; fault diagnosis; analyse; locate; fault finding; consequences; performance; electrical plant; electrical comp