Bus bars can be used in cases where very heavy current passes through electrical equipments or in situations, which needs distribution of heavy current in a building. Bus bars can be both open or closed. Open bus bars are generally used in manufacturing units and power company switch yards. They are never used in publicly-accessed areas. 

Conductor bars are grouped with insulators in grounded enclosures for use in industrial applications. These assembled bars are called Bus Ducts. 

Electrical Bus Ducts are mainly used for providing connection to big switchgear or for distributing main power supply in a building. 

Types of Bus Duct

• Plug-in Bus Duct: This type of bus duct is used to distribute power along the length of a building. 
  

• Segregated Bus Duct: These ducts either have all phase conductors in the same cabinet or have each conductor separated by a grounded enclosure from the surrounding phases.
  

• Cable Bus Duct: It is used for conducting large current across equipments or devices. 
  

• Isolated-phase Bus Duct: These ducts are used for passing very large current in generating stations or substations, where providing circuit protection is difficult. In this type, each phase of the circuit is run in a separate grounded metal enclosure. 

One of the greatest advantages of bus ducts is that they are capable of adding or removing a branch circuit without removing voltage from the whole duct.

Uses & Applications
Bus ducts are widely used in electrical applications. Some of the other application includes:

• Building wiring 
  

• Electric power transmission
  

• Industrial power plugs & sockets 
  

• Multiphase power plugs & sockets 
  

• Electrical wiring 

Bus Duct	Bus Duct Assembly	Bus Duct Assembly