Busbar Trunking System or BBT

BBT or Bus Bar Trunking system is a replacement to traditional cable and panel distribution. MCB, MCCB in BBT is plugin component as bus is extended to consumer area.

Fig: Busbar trunking

Busbar Trunking System is a not that new technology, in 1930 it was first introduced in USA. Comparing with the conventional wire or cable BBT is far better. In some modern construction, people now prefer BBT other than cable.

                                               Fig: Busbar trunking or BBT explanation

What is Busbar Trunking System

We know about busbar.  Three-phase incomer from generator or a source at first comes to a three phase bus bar by cable or wire, then circuit breaker or other device connection is made with cable from bus bar, circuit breaker / protection device and bus bar stays in the panel board.
  

                                                                Fig: Busbar trunking system layout

                                                                       
                                                                   Fig: Bus bar trunking BBT tap off box

Load is outside in use area, connected with cable from circuit breaker/ protection device. So bus bar is receiving and supplying power by cable or wire. However, with Busbar Trunking System, there is no cable or wire at all. There is no panel. Bus bar is extended through the use area. A circuit breaker / protection device can just plug in the Busbar Trunking and connect load from the circuit breaker.