Busbar Ampere Rating

Busbar Ampere Rating. Consider the same bus bar size of 100 sqmm x 10 mm thickness, hence the total current carrying capacity would be 600amps for the 100×10 mm busbar. This was observed on samples exposed for 60 days in an industrial environment, and it is probably identical to that of bus bars in service.

copper busbar ampacity table from www.microfinanceindia.org

Desire current rating of bus bar (i2) =630 amp; So if i use copper, mine 820 amps load for this 410 sqmm busbar should be used. Unipolar busbar supports multipolar busbar supports i cc up to 80 ka i cc up to 80 ka i cc up to 50 ka edgewise mounting sb c 10 sb c 15 sb c 20 sb c 30 sb c er power nominal current i n i cc up to 50 ka i cc up to 80 ka i cc up to 120 ka (short circuit current) busbar supports with fixed interphase busbar supports with adjustable interphase i cc up to 80 ka flat mounting

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Now for more security 25% extras should be added. Current rating of bus bar after de rating factor (i1)=630×0.9;

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Ampere frame rating can be higher depending on the temperature derating factor applied. Aluminium carries 3000 amps (0.8 x 150 x 25) current;

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Here the above mentioned rules are not standard. Please helpme in finding out busbar current rating when there is 27.3 mva generator, generation voltage 11 kv, this gives a current rating of 1432.9 amps with 20% safety margin gives 1719 amps.

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Here the above mentioned rules are not standard. Then = 656 x 1.25 = 820 a.

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705.12(d)(2) bus or conductor ampere rating. Ampere frame rating can be higher depending on the temperature derating factor applied.

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1.2 amps / 1 sq.mm of copper. Silver busbar current carrying capacity = 1.6 * busbar width in mm * thickness in mm amps.

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Desire current rating of bus bar (i2) =630 amp; 1.2 amps / 1 sq.mm of copper.

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Consider the same bus bar size of 100 sqmm x 10 mm thickness, hence the total current carrying capacity would be 600amps for the 100×10 mm busbar. The sum of the ampere ratings of overcurrent devices in circuits supplying power to a busbar or conductor shall not exceed 120 percent of the rating of the busbar or conductor.

Busbar Size Selection The Size Of The Width And Height Of Any Busbar Is Fixed, But The Size Of The Length Is Not Specified.

Gi bus bar carries 2250 amps (0.6*150*25) current Ratings apply for single bars on edge operating in a 40°c ambient temperature with 50°c temperature rise. 1.2 amps / 1 sq.mm of copper.

Factors Influencing Busbar Ampacity Ratings:

So if i use copper, mine 820 amps load for this 410 sqmm busbar should be used. We can note on the chart that the thinnest copper busbar has a lot of resistance (264.0 microohms/ft), but as the thickness increases, the resistance drops dramatically. Ratings are for frequencies up to 60 hz.

The Sum Of The Ampere Ratings Of Overcurrent Devices In Circuits Supplying Power To A Busbar Or Conductor Shall Not Exceed 120 Percent Of The Rating Of The Busbar Or Conductor.

Unipolar busbar supports multipolar busbar supports i cc up to 80 ka i cc up to 80 ka i cc up to 50 ka edgewise mounting sb c 10 sb c 15 sb c 20 sb c 30 sb c er power nominal current i n i cc up to 50 ka i cc up to 80 ka i cc up to 120 ka (short circuit current) busbar supports with fixed interphase busbar supports with adjustable interphase i cc up to 80 ka flat mounting Current rating of bus bar after de rating factor (i1)=630×0.9; This rating method avoids excess terminal temperature at the wire termination.

Now, If I Use Copper Busbar, Per Se 1A For This 0.5 Sqmm Busbar Should Be Used.

Current rating of bus bar after de rating factor (i1)=697amp Now for more security 25% extras should be added. Thumb rule for busbar :

Then = 656 X 1.25 = 820 A.

The major concern with ac power is when heat rise becomes an issue. So, what is important is the design (after derating as required) rating of incomer and busbar have to be same so that there is no bottle neck either in the incomer or in the busbar. The ieee states a busbar should be rated at the highest amperage passing through any section of the busbar, with a maximum of a 50° c rise in temperature from an ambient temperature of 50° c.