I hope someone here can explain this to me in terms I can understand (a challange, I know)
I understand that fuse/breaker and breaker/breaker "listed" combinations can be used to allow lower AIC breaker to be used on a higher AIC system.
In addition, we often require documentaion to 10kAIC for components by use of current limiting devices, or sysyem components (wire length,etc).
In this reagrd, I have a couple of questions:
(a) If a fuse "let-thru" curve shows a "let-thru" AIC of less than 10k (such as a 250 amp class J on 50,000) why could one not use any 10k rated breaker regardless of series listing?
(b) If a 10k AIC breaker is allowed as the load side breaker on a series rated system, does that indicate that a component witha 10k withstand is protedcted on the load side of the secod breaker ?
I understand that fuse/breaker and breaker/breaker "listed" combinations can be used to allow lower AIC breaker to be used on a higher AIC system.
In addition, we often require documentaion to 10kAIC for components by use of current limiting devices, or sysyem components (wire length,etc).
In this reagrd, I have a couple of questions:
(a) If a fuse "let-thru" curve shows a "let-thru" AIC of less than 10k (such as a 250 amp class J on 50,000) why could one not use any 10k rated breaker regardless of series listing?
(b) If a 10k AIC breaker is allowed as the load side breaker on a series rated system, does that indicate that a component witha 10k withstand is protedcted on the load side of the secod breaker ?