Chairman of the Bored
What the hell was their purpose 40+ years ago? I mean why bother? What am I missing?
If you still had lighting it wasn't wired right. The top 6 spaces are only for 240 volt appliances rather than single pole branch circuits. Common issue.
Yup. 100A MLO with appliances at the top and a 60A feeding the GP loads on the lower buss. Novel idea, but they end up getting loaded with tandems top and bottom buss anyway. :laughing:6 throw rule. Cheaper to have a 60 amp main over a 100, 125, 150 or 200amp main.
Dumb idea, since a whole lot went wrong.
That would be backwards.
FWIW they still do 6 throws to this day where economy is desired. Large facility near by only a few years old has a 2000 amp switchboard with 5 mains and a 6th spare. The breakers add up close to 3000 but Load demand calc prevents the gear from overloading.You are close. It saved the price of a MAIN breaker.