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Disconnection times: putting it all togetherDisconnection times, in a minute.

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Is it a final circuit? Sockets ≤ 63 A, or only fixed equipment ≤ 32 A? yes Table 41.1 (U₀ 230 V, AC) TN 0.4 s · TT 0.2 s yes Distribution circuit no Not covered by Table 41.1 no TN Reg 411.3.2.3 up to 5 s TT Reg 411.3.2.4 up to 1 s
The whole masterclass on one page. Decide the circuit type first, then the earthing system gives you the time.
Sparky's advice
This can feel overwhelming, but it's not meant to be. Rewatch it two or three times, then draw your own installation like ours, with different circuits, and work out which table or regulation each one falls under and what its time is. This topic gets a lot of questions, so it's an important area.

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That 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.

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