aelectricalman
Senior Member
- Location
- KY
Im in a situation where we have a 208/120V panel feed from a 480V system. This is an old warehouse/factory that was closed many years ago and the equipment we are using was originally in an area for the front offices. There is the 480V panel and a transformed 208/120V next to it. The transformer that feeds the 208/120V panel is only rated to supply max 80 amps. The 208/120V panel fed from it, is fused at 30 amps. Well, thats a dilema because we are now converting this to a fitness center where 2 tanning beds, 2 saunas and a clothes dryer will be required to run 208V. There will also be 7- 16 amp treadmills at 120V. So, at 80% use we are looking at somewhere around 150 amps. This XFMR also feeds a small panel that was once for "clean power", iso. Now the issue is that I have to put in a 150 amp disconnect and get 150 amps to the gym in place of the 30 amp. Next to the transformer in question (80amp), I have an identical transformer with fairly similar impedences. I dont think we will have any heating issue. These are older XFMRS, and my concern is that if one fails I might have trouble! Can I lock out one, when the other trips with a contactor and have a safe assembly. Are there any other major issues I should look at? Will I have any tap issues since these are older XFMRs? Is this a bad idea?
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