Earthing: how an earth pit works

A pipe buried in the ground is quietly saving your life 🌍⚡

1️⃣ INSIDE THE PIT: a GI pipe (or plate) about 3 m deep, packed in layers of charcoal and salt that hold water. A funnel lets you pour water in. The green earth wire from your home is clamped on top. Wet soil carries current away easily.

2️⃣ WHY IT MUST BE LOW OHMS: if a geyser's heater leaks to its metal body, the fault current rushes down the green wire into the ground and the protection trips. But a DRY, bad pit (say 100 Ω) lets only 230 ÷ 100 ≈ 2 A flow — a 16 A MCB never trips, and the metal body stays LIVE. An RCCB (30 mA) still trips, which is why you need both.

3️⃣ KEEP IT WORKING: get the earthing tested every year by an electrician with an earth tester, keep the pit moist in dry months, and a neon tester on the earth pin must NOT glow.

⚠️ Earthing work = licensed electrician only.