Bus 1sec fault rating vs IEC 60909-0
Bus 1sec fault rating vs IEC 60909-0
(OP)
Hi,
I have a bus which has a 25kA/1sec fault rating. Is this normally compared to IEC 60909-0 sub-transient, transient or steady state fault level? Any help is appreciated.
I have a bus which has a 25kA/1sec fault rating. Is this normally compared to IEC 60909-0 sub-transient, transient or steady state fault level? Any help is appreciated.






RE: Bus 1sec fault rating vs IEC 60909-0
RE: Bus 1sec fault rating vs IEC 60909-0
RE: Bus 1sec fault rating vs IEC 60909-0
It should always be sutransient to get the maximum symmetrical short circuit current at the location to compare with bus rating.
RE: Bus 1sec fault rating vs IEC 60909-0
Is there a standard (preferably IEC or AS) which specifies this? I certainly support this approach(especially since the switchboard does not have a shorter time rating). However I have been getting some pushback saying this is overly conservative, and would like something concrete to point to.
RE: Bus 1sec fault rating vs IEC 60909-0