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House wiring (Single Phase)



Single-phase house wiring electricity supply consists of one phase wire known as hot wire and one neutral wire connected in Energy meter by PSPCL as input supply 220V/240v. Then output 240V supply is taken from the Energy meter to the MCB distribution box where ELCB, DP MCB / Isolator is used as the main control.

The neutral wire from MCB Box neutral link is connected to each switchboard socket and
other loads and Switches are installed on the switchboard of each room to operate its respective load for example fan, light, TV, fridge, press, washing machine, etc. through sockets.

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Items required as per load for house wiring

  • • PVC wires: Generally 4.0 mm2, 2.5 mm2, 1.5 mm2, 1.0 mm2, 0.75
  • • MCB distribution Board: 6 Way, 8W, 10W, 12W, 16W
  • • MCB’s: 6 AMP,10A, 16A, 20A, 25A, 32A, (SP/SPN)
  • • RCCB or ELCB: 16A, 25A, 32A
  • • Switches: 6Amp, 16 Amp, 20 Amp
  • • Sockets: 5 Pin 6 Amp, 6 Pin-16Amp, 20A, 25A, 32A
  • • Bell Switch: 6Amp
  • • 2-Way Switch: 6 Amp
  • • Various loads in rooms
  • • DP Isolator

Residual Current Circuit Breaker (RCCB)

Residual Current Circuit Breaker

Residual Current Circuit Breaker (RCCB) is a device that provides protection in an electric circuit in case of overload, short circuit, and earth fault. Usually, it is to be used as a main in the MCB distribution board.

Poly Vinyl Chloride (PVC) Wires

Generally, we use PVC copper flexible wires are used in wiring. These flexible PVC wires copper are in the sizes 0.75 mm2, 1.0 mm2, 1.5 mm2, 2.5 mm2, 4.0 mm2. Before wiring, we perform calculations of the total load of the house, rooms, etc. to select the proper size of wire to be used.

PVC wires

The 1.0 mm2 can withstand a 1KW load (6 Amp.) while 1.5 mm2 can be used for 1.5 KW load (7-8 Amp.) and 2.5 mm2 for 2.5 KW load (16-17 Amp.). Normally, 0.75 mm2 wire is used as Earth wire in house wiring.

We recommend the use of branded, ISI marked wires only and cheap wires should
not be used.

Electrical Accessories

Electrical accessories

Generally 6A switch, 6 Amp. 5 pin socket, 16A/20A switch, 16/20 Amp. 6-pin socket, AC plug point, Fan regulator, Dummy, plates, cover plate, 2-way switch 6Amp / 16 Amp is required for house wiring. The 6A switch is used for all light points and the 16A/20A switch and 16A/20A 6-pin socket are used for heavy loads.

While 2way switches are used for staircase light control and entry gate lights.

All electrical accessories for house wiring should be of ISI marked, branded bearing good look and as per the choice
of the owner.

After completing all wiring connections, we check again for any loose connections. The operation of all points, MCB tripping, and ELCB operation are also checked.