The Copper Connection Podcast – Season 2, Episode 79, Sign Your Name to It — Commissioning and Handover of Cold Water Systems | Unit 310 Phase 3.
There's a moment at the end of every job where the customer looks at you, not the boiler — because they're about to trust something you built. That's what commissioning is really about.
In this episode, host Chris Bailey covers Unit 310 of the 9289 City & Guilds Level 3 Diploma in Plumbing and Domestic Heating — Phase 3, Session 1: commissioning and handover of cold water systems, steps 2 through 5.
Chris covers:
✅ The full 11-step commissioning procedure, in order, and why the sequence matters
✅ The visual inspection checklist — open ends, connections, supports, valves, cisterns, FOVs
✅ Marking and labelling pipework — and the Category 5 water rule for rainwater harvesting and greywater reuse
✅ Filling and venting at normal operating pressure
✅ The soundness test explained in full — Water Regulations 1.5 × MOP, WRAS G12.2 and R12.2
✅ The BS EN 806 calculation cleared up: MDP = 1.5 × MOP, test pressure = 1.1 × MDP = 1.65 × MOP
✅ The full metallic pipe test procedure — 90 minutes total, zero pressure drop allowed
✅ Test A and Test B for plastic pipework — the exact figures you need
✅ Full Worksheet 1 walkthrough with the worked pressure calculation
This episode is essential listening for:
— Plumbing apprentices on the ST0303 Level 3 standard working through Phase 3
— T-Level Building Services Engineering learners
— Anyone preparing for the 9289 Phase 3 practical assessment and portfolio evidence
🔗 Handouts, worksheets and revision resources at thecopperconnectionpodcast.co.uk
Next episode: Unit 310 Phase 3 Session 2 — Flushing, disinfection, operational checks, documentation and handover.
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