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ETAP Short Circuit Analysis Report Critical

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PoliPoliCarps

Electrical
Nov 9, 2018
35
Hi Can anyone help me?
I try to run Short Circuit Analysis and report shows the following critical errors.
Please see my picture below.
What could be the following solution?

Short_Circuit_Analysis_Report_rey5ut.jpg
 
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I don't use ETAP but it looks like the circuit is overloaded? Are the breaker ratings correct? Are the conductor sizes correct? Are the attached loads correct?
 
ETAP compares the Circuit Breaker (CB) rated short-time withstand thermal energy in Mega Joules (MJ) with the calculated thermal equivalent short-circuit energy in MJ. In your snapshot, rating/limit value is less than the calculated value (operating). It means to the selected CB should be under rating for short circuit rating.

The Gunner/EE8
 
Hello Mr. Gunner, When you say my CB is under rated are you talking about the short circuit kA?
For example.. the calculated 3Phase duty Fault is 91kA and I choose 100kA. I still get the warning Thermal Energy

2018-12-23_12-26-17_zipyaz.jpg

2018-12-23_12-26-36_rlobis.jpg
 
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