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Part 1: scope, object, fundamental principlesIs electric vehicle charging covered by BS 7671?
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Part 1 is short and yields 4 exam questions. It answers three kinds of question: what the book covers, what it's for, and the safety principles behind everything else.
| Chapter | What it does | Typical question |
|---|---|---|
| 11 | Scope — what's included and what's excluded | "Which is included in the scope of BS 7671?" |
| 12 | Object and effects | Relationship with statutory regulations |
| 13 | Fundamental principles | "Which sets out the fundamental principles…?" |
110.1 gives the list of what the Regulations apply to — a typical question asks whether electric vehicle charging is covered, and you find it simply by reading the list. Turn the page and 110.2 gives the exclusions — lightning protection systems, for example.
120.2 is the one that catches people: it states that Chapter 13 sets out the fundamental principles, and does not include detailed technical requirements which may change with technical developments. So a question asking where the fundamental principles are set out points to Chapter 13, not Chapter 11 or 12 — and Chapter 13 is not where the detailed technical requirements live.
New materials and inventions. BS 7671 doesn't forbid something new. Where a new material or invention leads to a departure from the Regulations, the resulting degree of safety must be no less than you would get by complying with them. That is the designer's judgement, and the departure is recorded on the certificate. Example: a new type of fused connection unit with no British Standard yet can still be fitted.
Chapter 13 also carries the protective measures. A typical question asks which is not a method of providing fault protection, and the answer is the one not in the list — note the trap word not.
One layer between you and a live part: insulation on the conductor, or an enclosure/barrier such as a consumer unit lid or a switch cover.
Protection when something has already gone wrong: mainly ADS (automatic disconnection of supply), also double or reinforced insulation, electrical separation, ELV.
110.1 · what the Regulations apply to 110.2 · exclusions from the scope 120.2 · Chapter 13 holds the fundamental principles Part 1 · new materials and inventions: safety no less than compliance Chapter 13 · fundamental principles, protection for safety
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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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