27hillcrest
Senior Member
I have a 480v 4000amp 65k AIC rated gear. I need to install 2 400amp panel boards. Does the Aic rating of the new panel boards need to be 65k or can I use 22k?
I have a 480v 4000amp 65k AIC rated gear. I need to install 2 400amp panel boards. Does the Aic rating of the new panel boards need to be 65k or can I use 22k?
You need a panel that is rated for the AIC at the location. If the new panels are some long distance
away then the fault current will be less. If the panels are close the the present panel then the fault
current will likely be the same. You need to check the actual fault current available. It might not be 65K.
Bob you just beat me to this!!:lol:
The longer the distance is the higher resistance will be, higher resistance results in lesser AIC required.
Close, but that would be reactance that limits fault current not resistance :slaphead:
I'm sure that was just a typo, right?
That is true in every case you state. Air core reactors are wound so that they have a high reactance. Much higher that 600 volt cable. Thats not true with cable.
I was speaking of the reactance of the cable mentioned in the post.