MCC Busbar Size Requirement

It sounds as though buying the book is the first step, perhaps?

If you are building electrical equipment you need more than just the UL book. What are you going to do about bracing?

Rule of thumb.

1 square inch is good for 1000 amps.

It is nt advisable and may nt feed it conveniently for a period of time.U need to do little calculation on yr current carrying capacity of cables and or bursbar to get a good long time result.

Yr total full load motor current may be say 1804.4Amps,but other loads may raise it up to 1908Amps.Each time u start there is always more current drawn b4 the motors stabilize.The bursbar is equally affected gradually.U nd to add say 25% tolerance(25% of 1908=477).1908+477 gives 2385Amps.Look for the next available standard bursbar rating which could be about 2500Amps or thereabout and install this to conveniently carry yr loads for a reasonable period of time.Use good quality copper bursbars.

Patrick Whowha