Transformer Sizing

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lmno49

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I am trying to determine a general transformer size needed for commercial building that is going to be modified into a school work shop. There is going to be a welder area, wood working and Pottery (kilns). Now I am fairly new to this so I was hoping to get some ideas on where to start. I went and calculated the total demand that all the equipment will use (Table saws, grinders, kilns, etc) that total came to 159 KVA. The question I have is that not all that equipment will be running at the same time. So do derate some of the equipment? Also, I know you over rate equipment that is used continuously like the kilns to 125%, right? How much do I need to add for lighting and general outlets? The building area is 300? by 75? so it is fairly large. Any help would be appreciated.
 
Use the relevant NEC articles. If you dont have a copy you can get online access to it for free from the NFPA website - just create an account. For lighting you need to follow your local codes. Here in Cali I usually use a combination of title 24 wattage allowt and the footcandle recommnedations from the IES handbook - it varies based on application and also depends on the client.
Honestly it sounds like you need to get some good books and articles and get to reading. This forum's quality is superb, but I assure you that learning a topic as broad as "how to size a transformer" requires you to go far beyond the comments you will recieve here.
 
Thanks for the comments. I do need to do some reading and in the proccess of doing just that. They are looking for an aprox size not an actual size, so I was hoping just to get an idea of place to start looking, thanks everyone.
 
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