Free notes
How many RCD tests, and whyHow many RCD tests, and why?
Free from the notes: Sparky’s video on it, the section word for word as members see it, and a PDF to keep.
The notes
Exactly as they are on the site.
As a counting question: four tests for half-times and one-times — the two tests Guidance Note 3 recommends (Table 2.18(a) · p.96).
Why four and not two
Half times (½ I∆n) -> should not trip -> tested at 0° and 180° = 2 tests
One times (I∆n) -> should trip -> tested at 0° and 180° = 2 tests
----------
4 tests
Add the optional five times test and it becomes 6.
An auto RCD test cycles the whole lot for you.
Dedicated RCD testers do exist — around £130 — and will do ramp tests, individual tests and phase selection. A multifunction tester does the same job alongside everything else.
Free section from Sparky Study Notes. The full Level 3 notes, 1,463 practice questions and the video lessons: sparkystudynotes.co.uk
Test yourself on it
The tests are in the members’ area. Get one wrong and it shows you why, and where to revise.
Get new notes and exam tips from Sparky
About one email a fortnight. Unsubscribe any time. Privacy noticeThat was one section. There are 583.
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.
- 583sections of written notes
- 35video lessons
- 1,463practice questions
- 146diagrams, redrawn
- 18th Edition
- Building Regs
- PAT
- Fundamental Inspection & Testing
- Initial Verification
- Periodic Inspection & Testing