480 Generator
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 CAT Generator Set 800KW 480V  US $112,000.00
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 ICP RPSR150K 120KW 480V 60CY CLEAN POWER MOTOR GENERATOR SET US $7,995.00
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 STANDBY GENERATOR Generac 80 kW 277 480V 3 Phase Nat Gas Propane Fired US $21,912.00
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 Deutz Generator 25 KW 230 480 Volt 3 PH F3L 912 US $2,399.99
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 100 KW Diesel generator 12 wire 240 480 volts US $9,995.00
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 CUMMINS ONAN DIESEL GENERATOR 600KW 277 480V 4 WIRE ONLY 305 HRS EXC COND US $35,500.00
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 ICP RPSR125K 100KW 480V 60CY CLEAN POWER MOTOR GENERATOR SET US $7,995.00
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If I have a 480 P. to a 208 S. on a transformer, could I simply reverse the input and output?
I I am looking to buy a 208 to 480 transformer, would I simply buy a 480 to 208 and reverse the input and outputs? it's a 3 phase system and it is being supplied by an 80kW generator, then straight to an ATS to switch power from normal to emergency.
Yes, a transformer can be used to either step up or step down the voltage. The rating of a transformer is in KVA, so you can load it to the nameplate rating either way. One thing to consider though is your system ground. When you tie your generator feed back through your step up transformer and then to the ATS . The normal power source feeding your ATS is probably a 3 phase 4 wire grounded WYE system, and your step up transformer will probably have a 3 wire Delta primary. You need to be careful, especially if your ATS feeds any single phase loads. In that case, get a transformer with a WYE - WYE winding configuration. Make sure you follow the NEC code recommendations for a "separately derived source".
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