Bus Ducts

Medium Voltage and Low Voltage Bus Ducts
Bus ducts instead of cables in a distribution system has many advantages.
Bus ducts are less prone to faults unlike cables
Bus ducts, being mechanically more strong, has better short circuit capacities
Aging of the insulation in a bus duct is low compared to that in cables and the intermittent insulators can be replaced if required
Though bus ducts occupy more space, they are more mechanically protected 
Bus bars offer better cooling and so is most ideal for higher current ratings 
Terminations can be done better with bus bars and if done properly, chances of failures at terminations are nil.
The current carrying capacity of a cable is very much dependent upon the installation such as grouping , installed in air or trench etc.
The value of a bus duct depreciates very less compared to that of cable and it can be re-installed elsewhere with modifications with less waste.
Types of Bus Ducts:
A. With Copper or Aluminium Busbars as required
B. Indoor or Outdoor types
C. Interleaved Bus Bar system  for very large AC current carrying systems
Flexible Links : Either Fusion Welded Copper or Braided Copper Wire
Cu.Al Bimetal sheets : To eliminate galvanic corrosion at Copper to Aluminum connections.