lielec11
Senior Member
- Location
- Charlotte, NC
- Occupation
- Electrical Engineer (PE)
I have multiple switch and fuse switchboards on a project I am running a short circuit analysis on. It is in NYC and Con Edison is the utility. As some of you know, they have very high available fault current due to their network of underground vaults. For this project I was provided the following for available fault at the point of service:
200,000 kA
X/R = 10 (test X/R for LV fuses is 4.89)
Due to the high X/R ratio when I run my analysis the actual fault current used for the fuses in the service boards is over 200k. Does this mean the 200k fuse is actually not rated adequately in this example?
200,000 kA
X/R = 10 (test X/R for LV fuses is 4.89)
Due to the high X/R ratio when I run my analysis the actual fault current used for the fuses in the service boards is over 200k. Does this mean the 200k fuse is actually not rated adequately in this example?