Bus Ways - Ampacity Rating

http://cr4.globalspec.com/search/sitesearch?do=show&sort=textmatchrank&srch=busbar%20sizing&srchobjs=t%2Cc&fs=12&order=asc

thanks for the threads...

now, do you know something of bus ways.???

bussways are conduits used to carry bussbars. Considerations in design and application ratings varies and are available from major manufacturers / suppliers. pls check this site for more info; http://www.fireengineering.com/index/articles/display/5703495882/articles/fire-engineering/construction-concerns/2010/06/cc-electrical-busways.html

clearly stated..you mean to say bus ways are only CONDUITS and not a conductor at all.??.cause i thought bus ways already contains copper conductors inside..i have here with me a catalogue of busways from a certain supplier...and it says that conductor is already embedded on it..im confused

Do not confuse bussways with waveguides used in microwave transmission applications! The appearance maybe the same but electrical characteristics are much different!

Bussways are not energy carrying devices themselves, but instead they are devices that serves as an insulated troughings for the current carrying conductors. Similar in purpose and applications to a conduit except for the shape and size which are normally governed by the size of the energy carrying bussbars.

The busbars size required for the busway is vary depends on the design of the overall product. You can refer to the IEC60439-2 standard for the Busway system

just browsed freeenginerring site...it seems my thought was correct..there is already conductors embedded inside..thanks a lot guys..

Don't know where the idea came from that Busway had no conductors. Of course it does.

All you need to do is state the ampacity you want, don't get into calculating the cross sectional area, because each mfr is going to mount, insulate and space the bus bars inside in different ways, all of which will affect the cross sectional area they use to start with. But the one consistent thing between mfrs is the stated ampacity at the sated temperature and the stated resistance for use in calculating voltage drop. Here's really all you need concern yourself with from an application standpoint;

Ampacity.

Ambient.

Length, and associated acceptable VD if appropriate.

Orientation (Vertical or horizontal run).

Plug-in devices, if any.

thanks a lot JRaef...my heads all cleared now with the sizing-up of busways..another concern i have here is regarding its ratings..is it in per phase or of line-to-line value.??

The recommended solution is to write to a manufacturer