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Three Phase Electrical Wiring Installation in a Multi-Story Building

3-Phase & 1-Phase Electrical Distribution Wiring Installation in a Multistory Building






In today electrical wiring installation tutorial, we will show how to wire a Three Phase Consumer Unit Installation in a multi-storey building from Utility Pole to a 3-Phase Energy Meter & 3-Phase Distribution board and then How to connect Single Phase & Three Phase Loads in a Three Phase Wiring Distribution System in home electric supply system.


In our previous posts, We did it for Single Phase & Three Phase electrical wiring installation in home and already know that what are Three Phase Power, Why and when we need it? as well as MDB, DB, Final Sub Circuit, MCB, MCCB, CB and RCD etc. So we will have to go strait forward to the point as. Now lets begin.
Related Wiring Tutorials:

Requirements for Three Phase Wring Installation in Multistory Building

In this tutorial, we need the following wiring accessories to wire three phase power in home.


  • Three Phase Energy meter = 1 No
  • Three Pole MCCB, 63A = 1 No
  • Double Pole, 63A, 30mA Trip Current RCD = 3 Nos
  • Double Pole MCBs, 63A = 3 Nos
  • Single Pole, 20A, MCB =  6 Nos
  • Single Pole, 16A, MCB =  3 Nos
  • Single Pole, 10A, MCB =  6 Nos
  • Distribution board cases =  3 Nos
  • Bus bar Link for Neutral Cable Connections
  • Copper strips for MCB common connection =  3 Nos (Cu Busbar segment)

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