Bus Duct Design

Are you willing to pay for the information?

Here's a short PDF that should send you in the right direction for FREE.

Get a quotation from a reputed manufacturer and compare.

For 4000 Amps Busbars selected is not adequate.

Busbar selection will depend on ambient temperature, temperature rise permitted and overall enclosure dimensions.

Distance between Supports depend on short circuit withstand capacity of the Busduct.

In my opinion for 4000 A LT Busduct,for temperature rise of 35 deg C over an ambient temperature of 50 deg C, the Aluminium busbar to be selected to be 4 runs of 200 x 10 mm per phase and 2 runs of 200 x 10 mm for neutral.

The Busbars and inside of the Enclosure to be matt black painted.

The Aluminium selected to be electrolytic E91E grade.

For any further clarifications/design details you may contact me privately

can i pls get the bus duct sizing for AL and Cu..pls send to my mail id...anitha.vellaiperumal@gmail.com

As per B.S. 162-1961 following reference values are admissible for voltage upto 415v / 440v:

Minimum length of insulator = 19 mm (Direct length from the live metal to earth, regardless of shape).

Minimum clearance to earth = 16 mm.

Minimum clearance between phases or between connection of the same phase seperable electrically from each other = 19 mm.

Conventionally minimum 100 mm seperation is maintained between one bus bar to another (conductors) by the manufacturers to allow overlaps at the joints, to carry out nut bolting and for ease of fabrication.

Bus Bar support is in the form of readymade insulator or bakalite sheets cut-slot to accomodate the bars. `

Sheet metal Gauge size is 14 for the enclosure.

Since melting point of aluminium is low therefore copper is normally selected from the point of short circuit sustaining.

Further the enclosure should be made out of Aluminium to avoid eddy current and thereby heating of enclosure.

If the Sheet steel enclosure is designed then there will be circulating eddy currents which will heat the enclosure.

In a situation where there is the possibility of high fault current I would avoid aluminium. Twice I've had to sort out the mess when aluminium bus bars have buckled under stress.