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brizospark

In the case of adjustable breakers which value goes in the column for protective device

i.e. if it a a 200a breaker and it has been tuned down to 180a?
 
You will then have to look at the graph of that type of breaker in BS7671, to get Zs values
 
As the 200A MCCB has been adjusted down to 180A that is the value to be taken. Are there any other adjustable parameters on this MCCB?? Always remember that adjustable MCCBs do not have a common trip value like MCB types. (B,C,D,) They are can be considered as ''one offs'' as there protection levels will vary according to the adjustment values being set on such breakers....
 
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