Duplicate wire is one of the more common problems in building material, and one of the few where getting it wrong can burn a house down. It is worth five minutes of your attention.
The scam is simple. A cable is sold as 1.5 square millimetre but the copper inside is thinner — perhaps 1.1 or 1.2. It looks identical, it costs less to make, and it works fine until the day the circuit is fully loaded.
Why it matters
A conductor is sized to carry a certain current without getting hot. Undersize it and the same current produces more heat, inside a conduit, buried in a wall, often for years before anything happens.
The failure is not usually dramatic at first. Sockets discolour. A switch feels warm. Then one summer with the air conditioner running, insulation softens and a fault develops somewhere nobody can reach.
Checks anyone can make
Look for the ISI mark and licence number. Genuine cable carries the ISI mark with a licence number printed on the sheath, repeated along its length. Not a sticker on the coil — printed on the cable itself.
Read the printing along the cable. Brand, size, voltage grade and often a metre marking should be printed repeatedly and legibly. Blurred, patchy or missing print is a warning.
Check the coil length. A standard coil is ninety metres. Short coils are a quieter version of the same trick — you pay for ninety and get eighty.
Feel the weight. Copper is heavy. If you have handled cable before, a coil that feels light for its size probably is.
Look at the copper itself. Cut the end. Genuine electrolytic copper is bright and uniform. Dull, reddish or unevenly stranded conductor is a bad sign.
Ask for the bill. This is the most reliable test of all, and the least technical.
The bill is the real protection
A shop willing to sell without a bill is a shop with no accountability. If the cable fails, there is no record that you bought it, no warranty claim possible, and no manufacturer obligation.
Every purchase at Sky Enterprises comes with a proper GST invoice. That is not paperwork for its own sake — it is what makes a warranty claim possible, and it is what an insurance company will ask for if there is ever a fire.
Buy on price, but know what you are pricing
Cheaper cable is not automatically fake. Different brands genuinely price differently, and there are honest budget ranges.
What should worry you is cable that is much cheaper than everything else, sold loose, without printing, without a bill. Copper has a market price. Nobody sells it far below that and stays in business honestly.
We are authorised dealers for KEI, RR, Vishal and Havells cable. That means the stock comes through the manufacturer's own distribution, and the bill we give you is the one the manufacturer will honour.