What is the reason for not putting a breaker directly accross from the main? The city managment group I'm contracting for want me to label the main as #1 and accross from it #2. I told them #1 starts below the main.
If the main is a back fed device that plugs onto the bus, there is usually a limitation to the total amps of breakers connected to any one stab.
If the main breaker is plugged into a space that would normally be occupied by a branch breaker, I see no problem marking it as #1 and identifying it on the panel schedule as a main breaker. IMO, it would need to be identified anyhow to comply with 110.22.
[This message has been edited by Tom (edited 08-30-2005).]
Few things are harder to put up with than the annoyance of a good example.
If you think about it, it seems that the best practice would be to place the highest-rated branch device on the same lugs as the backfed main. This would minimize the current passing from the main's lugs to the buses.