Short circuit calculation for residential electrical service 1

[stevemechanical]

Where can I learn how to do a short circuit calculation? I need to select the short circuit protection rating for entrance equipment for a single family home 230V/1PH/200 amp service. How do i figure this out?

website Links/tutorials would be great. Thank you.

 

[davidbeach]

10kA. Utilities go to great length to make that value true.

Look at faq238-1287 for lots of good resources. The Red Book, the Buff Book, and the Conrad St. Pierre book might be the best first places to start.

 

[HienN]

If possible, the small branches MCBs should have short-circuit rated at 5kA to get a good coordination. Then some main lines rates at 10kA as Steve's.

 

[BJC]

The easy way is to go here.

http://www.alabamapower.com/architect/pdf/A E Fault Currents Tables FINAL 8 2003.pdf

Go outside and see what size the transformer is.
There is a good free write-up on single phase faults on the Bussman fuse site.