Construction & Building Services
Specification: 610/2220/2
The CITY-AND-GUILDS-OF-LONDON-INSTITUTE Vocational Construction & Building Services specification covers 167 topics with 641 learning objectives (610/2220/2). Use the topic browser below to explore subtopics, exam tips, common mistakes, and key terminology for each area of the course.
This subject will help you develop key knowledge and skills required for exam success.
167
Units
641
Learning Outcomes
1044
Assessment Guidance
1168
Key Skills
Key Features
- Master key concepts
- Develop exam technique
- Apply knowledge effectively
Common Exam Mistakes
Pitfalls to avoid in your exams
- •Confusing mandatory signs (blue) with prohibition signs (red) due to misreading symbols.
- •Assuming that PPE eliminates hazards rather than being a last resort control measure.
- •Focusing solely on physical hazards while overlooking health hazards like dust or noise.
- •Failing to recognise that safety signs must conform to specific regulations and standards.
- •Underestimating the high pressures involved, leading to use of incorrect grade copper or alloy pipes, fittings, and pressure relief settings not rated for transcritical operation.
- •Neglecting to purge with nitrogen during brazing, causing oxidation inside pipes that can block valves or capillary tubes, especially critical in small-diameter CO2 circuits.
- •Inadequate evacuation time or failing to use a vacuum gauge, leaving non-condensables and moisture that form carbonic acid, leading to internal corrosion.
- •Charging by pressure rather than by weight, resulting in overcharging that can cause liquid slugging during start-up or excessive subcooling that masks a blockage.
Top Examiner Tips
Expert advice for exam success
- •Always link answers to realistic construction scenarios, such as working at height or manual handling.
- •Use precise terminology: refer to 'hazard', 'risk', 'control measure', not informal language.
- •For multiple-choice questions, rule out options that do not match the sign category or purpose.
- •In written responses, structure answers around the hierarchy of control and legal duties.
- •In practical assessments, narrate your actions as you work: explain why you are selecting a particular test pressure, how you verify oil return during commissioning, and why each safety step is critical.
- •Be meticulous with paperwork: assessment worksheets, commissioning logs, and de-commissioning records must be complete, legible, and show calculations (e.g., pressure decay, charge weight).
- •Highlight your awareness of CO2 phase behaviour: during oral questioning, mention the triple point and critical point, and how they influence system design and start-up procedures.
- •For installation tasks, always reference relevant standards (BS EN 378, IOR guidance) and demonstrate correct use of specialist tools like high-pressure gauges and CO2 leak detectors.
Qualification Units
How this qualification is graded
Vocational qualifications are marked against criteria, not an exam percentage. Each unit is assessed across three bands - build up from Pass by applying your knowledge to realistic workplace scenarios.
Accurately describe and explain the core knowledge for the unit and link it to the given scenario.
Apply and analyse that knowledge in detail, showing why it matters in the workplace context.
Evaluate and justify decisions, weigh up alternatives and make well-reasoned professional recommendations.
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