Energy Storage Group Meeting | Thursday 15th June | Centre for Sustainable Technologies Ulster University | Jordanstown

1. 076 S/S Circuit Breaker Install 1.0 Page 1 of 5
Trailblazers (Power) – Unit 076
Install Substation Circuit Breakers
This training specification has been developed from the Power Network
Trailblazer Standard. The specification details the required skills, knowledge and behaviours to
establish competence to carry out the installation of electricity circuit breakers.
The specification details the requirements for THREE separate categories. Candidates may be
assessed and receive registration for any ONE or a COMBINATION of the following -
1. Transmission Circuit Breakers
2. Primary Circuit Breakers
3. Distribution Circuit Breakers (up to 20 kV)
This specification details the minimum skills, knowledge and behaviours that would be required
by a candidate to be assessed as competent. This does not preclude employers adding to the
skills and knowledge detailed by the specification in their own training programmes.
What does competence look like?
CBI1 Being able to confidently use tools and equipment to carry out installation procedures on
circuit breakers in a substation environment in accordance with Company procedures.
CBI2 Demonstrating a safety conscious approach to the control of hazards associated with
the activity whilst working and communicating effectively with other team members to
achieve tasks.
Candidates to be assessed as competent in this skill area shall have completed the modules
shown below or have evidence demonstrating an equivalent level of competence.
1. SHEA Power (Revised Version) – providing basic HS&E awareness and an introduction to
specific HS&E factors relating to the power sector
2. BESC/AME Substations – establishing the competence to enter, move around and exit a
substation work area in a safe manner

2. 076 S/S Circuit Breaker Install 1.0 Page 2 of 5
Performance Criteria
General Requirements. To be assessed as competent you must be able to -
1. Identify the substation and the plant / apparatus to be maintained using available
information in accordance with Company procedures
2. Select, inspect and wear the PPE required to carry out the work activity
3. Carry out a site specific risk assessment of the work area, identifying the hazards and the
control measures required (requirements included in SHEA Power and BESC/AME
Substations)
4. Apply and adhere to the control measures necessary to meet safety requirements for the
work activity e.g. safety documentation, work instructions and method statements
5. Identify and comply with demarcation arrangements for the work area in accordance with
Company procedures (where applicable)
6. Carry out a pre use inspection of the tools and equipment to be used, checking condition
and service information
7. Carry out the maintenance procedures on circuit breakers in accordance with
manufacturers specifications and Company procedures
8. Record / report results of the maintenance operation/s in accordance with Company
procedures
9. Ensure hazardous and non-hazardous waste materials are dealt with in accordance with
Company procedures and statutory regulations
10. Report and record incidents / defects in accordance with Company procedures
11. Store tools and equipment safely and securely and leave the substation work area in a safe
and secure condition in accordance with Company procedures
Task Specific – In addition, for EACH category to be taken you must be able to -
Category 1 Transmission Circuit Breakers
1. Carry out installation activities on ALL of the following circuit breaker types –
a) Air Blast b) Oil c) SF6
2. Carry out ALL of the following testing procedures –
a) Insulation medium tests Oil, SF6 and Air (to include dew point)
b) Insulation and continuity tests (secondary wiring)
c) Low resistance testing d) Timing and operational tests

3. 076 S/S Circuit Breaker Install 1.0 Page 3 of 5
Category 2 Primary Circuit Breakers
1. Carry out installation procedures on a minimum of TWO of the following circuit breakers.
ONE of which MUST include an oil circuit breaker –
a) Oil b) SF6 c) Vacuum
2. Carry out installation procedures on ALL of the following circuit breaker components –
a) electro-mechanical components e.g. contacts, springs, braids
b) arc disruption devices c) phase barriers
3. Carry out ALL of the following testing procedures –
a) Insulation medium test b) Insulation resistance test
c) SF6 pressure check & leak detection d) Ductor testing e) timing test
Category 3 Distribution Circuit Breakers
1. Carry out maintenance procedures on a minimum of TWO of the following circuit breakers.
ONE of which MUST include an oil circuit breaker –
a) Oil b) SF6 c) Vacuum
2. Carry out maintenance procedures on ALL of the following circuit breaker components –
a) electro-mechanical components e.g. contacts, springs, braids
b) arc disruption devices c) phase barriers
3. Carry out ALL of the following testing procedures –
a) Insulation medium test b) Insulation resistance test
c) SF6 pressure check & leak detection d) Ductor testing e) timing test

4. 076 S/S Circuit Breaker Install 1.0 Page 4 of 5
Knowledge and Understanding
To achieve any of the categories, you will need to know and understand:
General Requirements
K1. The principles of health, safety and environmental legislation in relation to work on
substation plant and apparatus e.g. Electricity at Work Regulations 1989
K2. The organisations safety rules, policies and procedures relating to work on or near
substation plant / apparatus e.g. safety documentation, demarcation
K3. How to identify the substation and the plant / apparatus to be worked on
K4. The hazards associated with work on or near substation apparatus and how to deal with
them e.g. exposed busbars, overhead conductors / structures
K5. The dangers of electricity and how an electric shock can be received including -
direct contact, infringing safety distances, induced voltage, arcing
K6. The electrical safety distances which must be maintained at differing voltages
K7. The appropriate PPE for work in substations and how to inspect, use and maintain it
K8. How to carry out a site specific risk assessment and identify workplace hazards
K9. How to enter, exit and move around a substation work area in a safe manner and (where
applicable) use and comply with demarcation arrangements
K10. The purpose and method of earthing substations and how to identify inadequate earthing
K11. The effect of adverse weather conditions on sub-station work activities
K12. How to update, report and record information in accordance with Company procedures
e.g. maintenance reports, test results, acts of vandalism / terrorism
K13. How to use, handle and dispose of hazardous and non-hazardous waste materials
K14. How to respond in the event of emergency situations in the work environment
K15. How to leave the work area and substation in a safe and secure condition. e.g. access
equipment secured, demarcation / screening removed, gates locked.
Task Specific – In addition, for EACH category to be taken you need to know and understand:
Category 1 - Transmission Circuit Breaker
K16. The function and operating principles of transmission circuit breakers
K17. The function and operating principles of transmission circuit breaker ancillary equipment
K18. How to carry out installation activities in accordance with Company procedures on
transmission circuit breaker plant and ancillary equipment

5. 076 S/S Circuit Breaker Install 1.0 Page 5 of 5
K19. How to carry out testing procedures on transmission circuit breakers
K20. How to interpret the results of testing procedures carried out on transmission circuit
breakers
K21. How to interpret and comply with Company standards, specifications and manufacturer’s
instructions
K22. The hazards associated with work on transmission circuit breakers and its associated
plant and equipment
Category 2 - Primary Circuit Breakers
K23. The function and operating principles of primary circuit breakers
K24. The function and operating principles of primary circuit breakers ancillary equipment
K25. The function and operating principles of primary circuit breakers protection equipment
K26. How to carry out installation activities in accordance with Company procedures on
primary circuit breakers, plant and ancillary equipment
K27. How to carry out testing procedures on primary circuit breakers
K28. How to interpret the results of testing procedures carried out on primary circuit breakers
K29. How to interpret and comply with Company standards, specifications and manufacturer’s
instructions
K30. The hazards associated with work on primary circuit breakers and its associated plant and
equipment
Category 3 - Distribution Circuit Breakers (up to 20kV)
K31. The function and operating principles of distribution circuit breakers
K32. The function and operating principles of distribution circuit breakers ancillary equipment
K33. The function and operating principles of distribution circuit breakers protection equipment
K34. How to carry out installation activities on circuit breakers in accordance with Company
procedures
K35. The methods and purpose of carrying out maintenance testing procedures including -
Insulation medium, insulation resistance, SF6 pressure check & leak detection, Ductor
testing and timing tests
K36. The hazards associated with work on distribution circuit breakers and its associated plant
and equipment