The Breaker Box

The breaker box is a marvelous invention and a big step above the old fashioned fuse panel­ and you don't run out of fuses. For the big stuff most people consult an electrician for the basic installation of their studio electrical system. Be sure to give some thought to the 85% rule concerning all the equipment you will have running in your workshop. Block this stuff out on paper: Kiln here, furnace over there, main gally of lights down the middle, etc. Use an amp meter to measure the power consumption of your various pieces of equipment then discuss this power usage schedule with your contractor.
Most studios can get by with a 200 Amp panel; that's pretty average. If you are planning to do a lot of electrical kiln firing you might try for 250 or 300, but keep in mind you seldom will need to fire two kilns at the same time. A staggered schedule will allow for a much smaller main panel. I have a 100 amp service and if I fire the big 60 amp kiln I simply put off using the arc welder and other large consumers of power until the firing is over. This works good enough but it does represent a compromise.
As you embark on this process you will be wise to study your national and local electrical codes. This might involve going to your library. I especially liked going to Border's Books and emersing myself in the "how to" section. But our "Border's" disappeared a few years ago. So now it is a trip to the Concord City Library. There are many books on wiring and electrical layout. Remember the codes are written for a purpose and that is to protect you and others' well being, not to mention your physical property.
If you are doing your own electrical work you can discover great resources at the Home Depot and other big box stores. There you can get most of your components and at a reasonable prices.
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