On a 800 amp switch gear 277 480 3 phase , I need to add a 150 amp feeder breaker do I need to match the AIC rating of my 800 amp main breaker ghanks
Bob is correct on all counts, but I have to admit, the initial "No" got my hackles up for a moment!The short answer is "No".
It can be higher in all cases.
It can be lower depending on the actual circumstances you have.
If the available short circuit current is less than the AIC rating of the 150A CB you can use it, even if the AIC rating is less than that of the 800 A CB.
If the 150A CB has a series rating with the 800A CB you might be able to take advantage of that.
On a 800 amp switch gear 277 480 3 phase , I need to add a 150 amp feeder breaker do I need to match the AIC rating of my 800 amp main breaker thanks