inrush current

[Abdel Rahman Mohamed]

Hello every body.

We have a case in our project that the supplier of lighting control system want to change the MCB from 16 to 20 amps as result of changing the light fixtures from fluorescent to led due to higher inrush current of the new one, is it correct?

Thanks in advance for your feedback.

 

[JFletcher]

This article may be of some use to answer your question:

http://www.wseas.us/e-library/conferences/2011/Corfu/SYSTEMS/SYSTEMS-52.pdf

 

[Smart $]

Need technical info on the existing and proposed breakers to say for certain, but AFAIK no typical inverse time breakers over here in this range will trip on such short duration inrush current.

 

[Abdel Rahman Mohamed]

This article may be of some use to answer your question:

http://www.wseas.us/e-library/conferences/2011/Corfu/SYSTEMS/SYSTEMS-52.pdf

Thanks a lot for providing me proper answer.:happyyes:

 

[Abdel Rahman Mohamed]

Need technical info on the existing and proposed breakers to say for certain, but AFAIK no typical inverse time breakers over here in this range will trip on such short duration inrush current.

Thanks, but as the information we got from the supplier that it happens before with them specially when dealt with LED.

 

[Besoeker]

Need technical info on the existing and proposed breakers to say for certain, but AFAIK no typical inverse time breakers over here in this range will trip on such short duration inrush current.

Don't they have a magnetic trip also?

 

[Smart $]

Don't they have a magnetic trip also?

Typical inverse time breaker over here has a thermal magnetic trip mechanism. Still far from instantaneous.


Source: http://www.eaton.com/ecm/groups/public/@pub/@electrical/documents/content/tb01200003e.pdf

 

[Smart $]

More examples of time current curves...

http://www.geindustrial.com/your-business/consulting-design-engineer/time-current-curves