Continuous Rating for Busbar Current.

The question should be like what should be the standard current rating of copper bar at so and so ambient temperature having so and so width and thickness?

Your second question need to be asked with more parameters included.

Thanks for this very useful link.

Hi,

There are a number of methods for giving guides to the bars rating, however they should only be used as guides. I have experience of significant changes in the ratings of bars the size of the bar alone is not enough to give you a figure.

The busbar current rating is dependent on a number of factors including; the assembly layout, the IP rating of the assembly however it can also be significantly affected by the supports of the busbars and the devices that the busbars are connected to.

IEC61439-1&2 are the applicable international standards for Low Voltage Switchgear and Controlgear Assemblies; it advises that unless certain specific conditions are met, the only way to be assured in the rating of the equipment is to perform verification tests.

Regarding the short circuit capability, we have developed an application for both Android and IPhone and IPad search for Transcalc, they are available free of charge. This application will inform you what the potential short circuit that can be produced by a transformer. The application also will calculate the busbar temperature rise expected to occur during the short circuit.

Have a look at these two companies website, one can provide technical support and one provides the testing service.

http://www.ka-testing.com

http://www.3phasedesign.com

I hope that this gives some guidance

Rob

I applaud you lads for sticking with this guy. You're saints