First - read the sticky - Electrical Primer for Brewers. It has a TON of information in the first post that helps you decide how much power you'll need.
How big are your batches, do you want the ability to brew back to back batches, and how much power do you have access to? You definitely want 240v.
If you're brewing 10-12 gallon batches you can use either a 4500w or 5500w elements for your HLT and BK. A 5500W element at 240V will draw 22.9A. A 4500W element at 240V will draw 18.75A.
For your RIMs tube, consider using a 1500w/240v element. That will draw 8.33A. Pumps usually draw about 1 amp or so to start, then something less than that after they start.
Knowing this you can piece together what you want and figure how much power you need.
If doing single batches you won't need to fire both kettles at the same time so your power requirements change. From the listing below determine which elements you want then add up the amperages then add about 20% more for a safety margin. i.e. if I have a 50A circuit, I wouldn't want to draw over 46A to stay within my safety margin. There are raging debates regarding the percentage use of a circuit, but personally I'd rather have the safety margin than run the risk of getting shocked.
5500W/240V=22.92A
4500W/240V=18.75A
2000W/240V=8.33A
1500W/240V=6.25A
With 30A available power you could run 4500W elements in your kettles, one at a time, plus a 1500W element in your RIMS tube, plus pumps.
With 50A available power you could run 4500W elements in your kettles, both at the same time, plus a 2000W element in the RIMS tube, plus pumps or
run 5500W elements, one at a time, with the 2000W element in the RIMS plus pumps.
With 60A available power you could run 5500W elements in your kettles, both at the same time, pluse a 2000W RIMS elements and pumps.
You get the idea. How much power do you have available to you?
