What’s Your Electrician Actually Doing During Testing?

What electricians test (in plain English)

• Insulation resistance: checks cable insulation is intact
• Polarity: confirms connections are correct
• Continuity: confirms earth paths are connected properly
• Earth fault loop impedance: checks a fault would disconnect quickly
• RCD testing: confirms life-saving devices trip within required times

Testing is not just about whether things “turn on” — it’s about whether the system will protect you in a fault condition.