Arc withstand vs short circuit withstand capability
Arc withstand vs short circuit withstand capability
(OP)
Hai friends,
The subject is switchgear. Short circuit withstand capability is specified as 25kA, 1sec (some utilities specify it to be 3sec).
How about Arc withstand - does the above also mean that the arc withstand shall be for 1sec??
To me, it appears that it is not practical. But, I am not aware of any codal stipulation on the subject. Could you please help.
Thanks.
The subject is switchgear. Short circuit withstand capability is specified as 25kA, 1sec (some utilities specify it to be 3sec).
How about Arc withstand - does the above also mean that the arc withstand shall be for 1sec??
To me, it appears that it is not practical. But, I am not aware of any codal stipulation on the subject. Could you please help.
Thanks.






RE: Arc withstand vs short circuit withstand capability
So when subjected to an arcing fault, almost anything can happen, including doors flying off, panels blown off, etc. You should not depend on closed door for protection against arcing faults.
There are standards for arc-resistant metal-clad switchgear. That equipment is tested for withstanding forces related to arcing faults.
RE: Arc withstand vs short circuit withstand capability