7 Electrical and Lighting Checks Before You Put Up Diwali Decorations

Every year, the same rush: boxes dragged out of storage, extension cords strung across doorways, and the main switch flipped before anyone has looked at a single connection. Diwali lighting failures, tripped breakers, melted sockets, small fires, almost always trace back to decisions made in that first excited hour. These seven checks slow that hour down just enough.

Plug each string into a socket and run it for five minutes before attaching it to anything. Look for flickering sections, bulbs that stay dark despite their neighbours lighting up, and any visible browning or melting on the wire insulation near the plug or along the string. A string that flickers on the floor will not improve once it is stapled to a wooden frame or wound around a dry garland. If the insulation feels brittle or cracks when you bend the wire gently, the string goes in the bin. Aged PVC insulation loses its flexibility and its resistance together.

The Bureau of Indian Standards ISI mark on decorative lighting is not a formality. It means the product has been tested for insulation quality, plug pin strength, and current leakage at the rated voltage. Cheap imported string lights sold loose at street stalls often carry no certification and are wired for voltages that do not match Indian supply. At 230V, an under-rated wire does not just fail, it heats. Buy from a named retailer, look for IS 1293 on plugs and IS 694 on flexible cables, and keep the receipt.

A standard Indian household extension board is rated for 6 amperes or 16 amperes depending on the model. Add up the current draw of everything connected to one board: a 10-watt LED string draws under 0.05A, but a rice-light set with an older transformer can draw 2A or more, and a kandil with an incandescent bulb adds another amp. The problem is not the lights, it is the lights sharing a board with a phone charger, a speaker, and a power bank hub. Keep decoration loads on their own dedicated extension cord and do not daisy-chain boards.

Push the plug in and pull it out once. If the pins come out with no resistance, the socket's internal contacts have worn loose. A loose contact creates resistance, resistance creates heat, and heat at a socket running decorative lights for six to eight hours a night across a two-week festival is a meaningful risk. The same check applies to the extension board's master socket. A socket that wobbles, sparks on insertion, or feels warm to the touch after ten minutes of load should not be used for continuous overnight lighting.

Any string light that crosses an outdoor surface, a balcony railing, a window ledge, a gate, needs wire rated for outdoor use. Standard decorative wire is not weatherproofed. Even in October and November, dew forms on metal surfaces overnight and condensation can wick along an unrated cable into a plug or a junction. Use outdoor-rated extension cable for the run from the indoor socket to the outdoor anchor point, keep all joins and plugs under a covered overhang, and never let a plug rest on a floor where water can pool. Zip-tie the cable to the railing rather than resting it loose, a cable that shifts in wind abrades against metal edges.

Open your distribution board and find the MCB (miniature circuit breaker) for the circuit you are loading. A 6A MCB on a lighting circuit will trip if the combined draw exceeds roughly 1,380 watts. LED decorations rarely approach this, but if the same circuit feeds a room with a ceiling fan, a television, and three or four string-light sets, the cumulative load is worth calculating rather than discovering at 10 pm on Diwali night. If you are unsure which MCB covers which sockets, switch them off one at a time and see which sockets go dead, it takes ten minutes and removes the guesswork.

This is the check that requires no tools. Decorative lighting is not designed for continuous unattended operation. A string that has been running for four hours is warm; one running for nine hours overnight, wound around dry thermocol, paper, or fabric, is a different situation. Plug your lights into a mechanical timer socket, available at any hardware shop for under ₹300, set it to cut power two hours after you typically go to bed, and let it run the same schedule every night. The festival lasts a fortnight. The timer pays for itself on the first night.