Alan I don't think that you have in your mind what George is describing.
I do not think we are talking about a breaker in a panel.
I believe he asking about a single breaker enclosure that is sometimes used in place of a fused disconnect.
George If I am correct about the installation the EC can feed bottom or top unless the breaker is marked line and load.
If you had asked me I would have written line and load on it but I really do not believe you could require me to.
On the job I was at today I have a 1600 amp single breaker in a large enclosure, I fed the bottom of the breaker as the feed is coming from a transformer (The supply conductors where down low already)
In this case I specified bottom feed when we ordered it. The only change that I can see from the top feed one I have is the direction the current sensor is facing on the neutral for the GFP.
Bob
