blueheels2
Senior Member
- Location
- Raleigh, NC
- Occupation
- Electrical contractor
I have 15900 A of available fault current at my service main. I’m installing a 600 amp disconnect with Class J fuses as the service disconnect. Leaving there it hits a transfer switch that has a withstand rating that exceeds the rating needed. From there I hit a main lug ILine panel that will have 200 amp breakers that will feed 200 amp mlo subs. It appears to me that in this configuration the series rating will be 10k at the branch circuit breakers. Looking at the Swuare D charts it appears the J fuse would series rate with a qo breaker for 10k regardless. Anyone find fault with my logic?