Why electricity is so deceptive
Unlike most hazards, you don’t see electricity coming. No smell, no sound — until the moment of the shock. That’s exactly why Brazil’s NR-10 standard exists: to set clear rules for any activity near wiring, panels, or energized equipment.
The single most important rule
Whenever possible, de-energize before you touch anything. It sounds obvious, but it’s the foundation of everything: shut it off, lock it so no one can turn it back on by accident, and only then confirm with the proper instrument that there’s really no voltage present. Skipping that last step is an open invitation for an accident.
The sequence that keeps people alive
- Cut the power.
- Lock out the breaker (no one re-energizes without authorization).
- Test with the correct instrument to confirm zero voltage.
- Ground temporarily, as an extra safety layer.
- Tag it clearly so everyone knows it’s locked out.
Who’s allowed to work on this?
Only people with specific, formal training — not just “knowing a bit about electrical work.” That means a structured course, defined hours, and periodic refreshers. Electricity doesn’t forgive people who think they know enough.
Worth remembering
If you’re not 100% sure something is de-energized, treat it as if it’s live. That one rule alone has prevented more accidents than any piece of equipment ever could.