Mumbai (also known as Bombay, the official name until 1995) is the capital city of the Indian state of Maharashtra.

It is the most populous city in India with an estimated city proper population of 12.4 million as of 2011.

Along with the neighbouring regions of the Mumbai Metropolitan Region, it is the second most populous metropolitan area in India, with a population of 21.3 million.

Mumbai lies on the Konkan coast on the west coast of India and has a deep natural harbour.

In 2008, Mumbai was named an alpha world city.

It is also the wealthiest city in India, and has the highest number of millionaires and billionaires among all cities in India.

Mumbai is home to three UNESCO World Heritage Sites: the Elephanta Caves, Chhatrapati Shivaji Terminus, and the city's distinctive ensemble of Victorian and Art Deco buildings.

Electrical wiring is an electrical installation of cabling and associated devices such as switches, distribution boards, sockets and light fittings in a structure.

Copper is a chemical element with symbol Cu (from) and atomic number 29.

It is a soft, malleable, and ductile metal with very high thermal and electrical conductivity.

A freshly exposed surface of pure copper has a reddish-orange color.

Copper is used as a conductor of heat and electricity, as a building material, and as a constituent of various metal alloys, such as sterling silver used in jewelry, cupronickel used to make marine hardware and coins, and constantan used in strain gauges and thermocouples for temperature measurement.

Mains electricity (as it is known in the UK; US terms include grid power, wall power, and domestic power) is the general-purpose alternating-current (AC) electric power supply.

It is the form of electrical power that is delivered to homes and businesses, and it is the form of electrical power that consumers use when they plug kitchen appliances, televisions and electric lamps into wall sockets.