Selectivity check not working

[sesa181861_brid]

Selectivity check is not working. Both Power Design (5.20) and ECT show selectivity to MTZ even it's clearly seen on tripping curves they are not. For other breakers, I did not even check because the feeders are already wrong.

[Genghiz]

Hello Arto,

Thaks for reaching this forum.

Can you please kindly provide us some additional information about the problem that you are explaining. 

kindly please enclose a snapshot of the application Or a project file for the further analysis.

Thanks & regards,

Team - Ecodial Expert Support.

[sesa181861_brid]

Hi, project attached. Tried the same combo with ECT. There cannot be selectivity if feeding breaker has lower settings than load side breaker.

[Genghiz]

The team is looking at this, we revert you with the comments.

[Genghiz · Accepted solution]

Hello, 

When an upstream device is set with a value (which is lower than) the downstream device rating; then logically the application should not verify the "selectivity between these devices."

Either; it should say 

• Not a valid combination / Not a valid settings for the selectivity study. 
• No selectivity 

This has been informed to the product development to consider this logic fix/improvement as soon as possible to get a fool proof selectivity study for the devices.

Thanks for keeping us informed on the same.

Team - Ecodial Expert Support