Chapter 00a — Mains safety: read before Chapter 09

Time: 0.75–1.0 h hands-on, first build · Sessions: 2 × ~30 min · Steps: 12

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StartBefore you start

Step 00a.1Decide who is doing the mains work

Step 00a.2Write the "who is in the room" rule and post it on the wall

Step 00a.3Buy a meter that is rated for the job

Step 00a.4Test the meter before you trust it, and again after

Step 00a.5Put the printer on an RCD/GFCI outlet you can reach

Step 00a.6Learn the protective-earth chain in this build

Step 00a.7The SSR is marked "earth the mounting rail" and this build does not

Step 00a.8Ferrules and the no-whisker rule

Step 00a.9Strain relief: nothing may pull on a terminal

Step 00a.10The fuse in the inlet, and what it does not protect

Step 00a.11Know the two power-on rituals before either one arrives

Step 00a.12Decide now what you do when it smokes, trips or bites

Checkpoint 00aTick before moving on

Gather per session — what to lay out before each bench segment.

• Steps 00a.1–00a.5 · ~30 min — Tools and consumables: multimeter with its rated leads; a known-live wall outlet
• Steps 00a.6–00a.12 · ~25 min — nothing to lay out

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