Re: Laundry Project
The code does not say the following very clearly, but it is nevertheless quite true: You are free to install a service that is sized to handle every single connected load in the facility, presuming that all are running at the same time. What section 220 does for us is to recognize that, for some facilities and under some circumstances, not all connected loads will be running at the same time. The code therefore allows us to size the service for less than the total connected load, and gives us methods, demand factors, and rules for calculating a ?minimum? service size. But if you are building a facility for which the code does not include special demand factors, then you must size the service for 100% of all connected load.
I have not gone through your entire list of loads, to see whether you have included everything that you need to include. I too am a consultant (by the way Roger, my qualifications for that title are that I charge a high fee for my services), and already know enough about your facility to know what additional questions I would be asking, if I were to take over the design efforts. But a quick addition of you list of loads gives me the result of 188.1 KVA. For a 3-phase, 208V system, this translates to about 522 amps (divide by 208, and divide again by the square root of 3). So I can surmise that a 400 amp service is out. The next step up would be 600 amps, but you might need to go higher (as I said, I don?t know if you have included everything).
As to the size of the service conductors, you can start with Table 310.16. But that will only give you the minimum size to accommodate the service amps. You may need to go with larger cables, if voltage drop is an issue.
