Free notes
Definitions worth knowingCan air count as insulation?
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Like BS 7671, this book has a definitions section, and the exam draws on it.
| Term | Meaning |
|---|---|
| Accessible metal part | Any metal part that can be touched by a test finger, or reached by a probe, that is electrically connected to the equipment's metal parts. This is where your test probe goes |
| Basic insulation | The single layer between you and a live part — the plastic casing, the insulation on a conductor. It can even be air |
| Basic protection | Protection against shock under fault-free conditions — enclosures, covers, sleeving, busbar guards |
| Fault protection | Protection against shock under a single fault, such as basic insulation failing |
| Exposed conductive part | Metalwork that can become live under fault conditions |
| Double insulation | Basic plus supplementary insulation |
Polarity
Polarity is simply line and neutral being in the right terminals. Get them swapped and you have reverse polarity.
Section 2 · definitions
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Sparky Study Notes is the whole Level 3 syllabus written up like this: the explanation, the worked example, and where it is in your book. With a video lesson for every part and a practice paper for every exam.
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- 18th Edition
- Building Regs
- PAT
- Fundamental Inspection & Testing
- Initial Verification
- Periodic Inspection & Testing