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ekstra   ara
 Post subject: MCCB Energy Let-Through vs. Irms for vent area
PostPosted: Tue Oct 16, 2012 5:28 pm 

Joined: Tue Oct 16, 2012 5:18 pm
Posts: 3
Hi all,

I am new to the forum - so hopefully my question is worthy of your time.

When considering the required vent area for a switchgear enclosure, how can the let-through energy of a MCCB determine this value? I performed similar studies incorporating the bolted fault current and detail of the phase separation/proportion of energy etc. though cannot seem to find a correlation.

DATA-
System fault level - 26.5kA
MCCB operating time - 12ms
Energy let-through - 4,110,173A2.s

Variables of cable impedence/enclosure volume are immaterial atm, simply looking for procedure.

Cheers


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