Electrical safety at home: what to check, and what never to touch

Most home electrical accidents come down to one of three failures, and all three are checkable.

1. EARTHING. The earth connection is what gives a fault current somewhere to go other than through a person. It is invisible, it degrades over years as the electrode corrodes and the soil around it dries, and nothing in the house behaves differently when it stops working — which is exactly why it goes unchecked for decades. It is tested with an instrument, not by looking at it, and the CEA regulations expect that test annually, on the driest day of the year — which is the day the earth resistance is at its worst and therefore the only honest day to measure it.
2. A RESIDUAL-CURRENT DEVICE — the ELCB or RCCB on your board. It compares the current going out with the current coming back, and cuts the supply when the difference means some of it is going to earth, typically through a person or a wet wall. 30 mA is the domestic rating intended to protect people, and it is what the Central Electricity Authority's current safety regulations call for on a domestic installation.
3. DRY WIRING. Damp is the Kerala-specific one. Moisture in a wall, a junction box or a switchboard lowers the insulation resistance between conductors, and that shows up as nuisance tripping, a mild tingle from a metal fitting, or in the worst case a live wall.

An ELCB or RCCB has a test button on its face. Pressing it creates a small deliberate imbalance so the device trips, which proves the mechanism still works — they can and do seize over years without any outward sign.

1. Warn the house first: the power is about to go off, so shut computers down and be aware of anything that does not like an abrupt cut.
2. Press the test button. The device should trip immediately and cut the supply.
3. Switch it back on.
4. If it did NOT trip, the device is not protecting you. Call an electrician — this is not a wait-and-see.

Monthly is the standard advice and quarterly is realistic. Either is infinitely better than the common answer, which is never.

The failures we get called to between June and September are consistent, and most of them share a cause: water somewhere it is not supposed to be.

• Tripping that only happens in wet weather — usually damp having got into a conduit, an outdoor fitting or a wall-mounted box.
• Outdoor fittings, garden and gate lights and pump connections filling with water where the gland or gasket has perished.
• Water tracking along a conduit from a leaking terrace or parapet and arriving inside a switchboard several metres away.
• Salt-air corrosion near the coast on outdoor connections, motor terminals and meter boards.
• Lightning and switching surges, which in this district are worth taking seriously for anything expensive.

A device that trips in the rain and holds in dry weather is not being over-sensitive. It is telling you there is a genuine leakage path that is only wet part of the time, and the correct response is to find it rather than to keep resetting.

None of these are ambiguous, and none of them are worth finishing the week with.

• A burning or fishy-plastic smell near a socket, switch or the board. That smell is overheating insulation.
• A switch plate, socket or plug that is warm to the touch.
• Scorch marks or discolouration around a socket.
• Buzzing or crackling from a switch, socket or the distribution board.
• Lights dimming when a heavy appliance starts, or flickering across the house.
• A breaker that trips repeatedly. It is doing its job — something is making it necessary.
• Any tingle from a metal appliance body, tap or fitting.

Changing a bulb, resetting a tripped breaker once, and using the test button are fine. Beyond that, the line is clearer than most people treat it.

• Anything inside the distribution board beyond switching a breaker.
• Anything on the supply side of the meter — that is KSEB's, not yours, and not your electrician's either.
• Adding a circuit, a new point or a heavy appliance connection.
• Earthing work, including "improving" an existing electrode.
• Any repair to a circuit that has already tripped repeatedly, until the cause is found.

The standards behind all of this are IS 732 for the wiring and IS 3043 for the earthing, and electrical safety in the state is overseen by the Kerala Electrical Inspectorate. You do not need to have read any of them — but an electrician quoting for work on your board should know them, and it is a fair thing to ask.

Our electricians are ID-verified and police-verified, and you get the name and photograph of whoever is coming before they arrive. Fixed price agreed up front, and a 30-day guarantee on the workmanship. Call +91 80751 58377 — if what you describe sounds like something to switch off now rather than book for Thursday, we will say so on the phone.