Electrical safety decision tool
Why did the MCB or RCCB trip?
Answer four simple questions. Get a likely fault path and a safe next action—without opening live electrical equipment.
This is a screening tool, not a remote diagnosis. A burning smell, smoke, sparks, shock or wet electrical equipment overrides every other answer.
Step 2
What the pattern means
Your result will separate urgent danger, likely cause and the next safe check.
Stop now
Next actions
Useful observations
Safety boundary
Do not remove covers, touch conductors, bridge a protection device, increase its rating, or perform live measurements. Repeated tripping indicates a fault or unsafe condition that needs isolation.