dissconection times

[Farmelectrics]

a disconection time of not more than 0.4seconds for circuts not exceeding 32a and 5seconds for circuts exceeding 32a been asked a question why is this surely the higher the current it should have a lower disconection time how do i explain this to a young keen apprentice

 

[telectrix]

nope. samsung galaxy S2.

 

[Engineer54]

Indeed, which is why in my view MCBs should not be connected in series as selectivity (discrimination) cannot reliably be achieved.

Depends very much on the current flowing during the fault....

 

[BigSi]

a disconection time of not more than 0.4seconds for circuts not exceeding 32a and 5seconds for circuts exceeding 32a been asked a question why is this surely the higher the current it should have a lower disconection time how do i explain this to a young keen apprentice

I recently had an NICEIC DI assessment, and I quoted those figures to the assessor during a test on a TN system, who didn’t know what I was talking about?