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Tool Talk Discussion Forum

Re: 480V 3 phase to 240V single phase

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Russ from MN

07-19-2013 06:40:20

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It seems there is as much bad advice as good! I would go with John T, it's not as simple as just using one leg!

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John T

07-19-2013 07:06:56

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 Re: 480V 3 phase to 240V single phase in reply to Russ from MN, 07-19-2013 06:40:20  
In our facility in an industrial building served ONLY by 480 3 phase yet where we needed standard 120/240, I tried to balance the loads and the three phases by feeding three seperate dry transformers one fed from each of the three phases of 480........ each would then in turn serve three different parts of the building


John T

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Dick L

07-20-2013 04:22:58

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 Re: 480V 3 phase to 240V single phase in reply to John T, 07-19-2013 07:06:56  
I only have 480 3 ph 800 amp coming into my plant. I have step down transformers hanging all thru the factory. Most step down to single ph 220 but some step down to 220 3 ph. I put them all in myself as needed. I have a 480 3 ph buss line running the length of my production/molding room. I have 9 molding machines all with one to three step down transformers in them. When adding a transformer all I do is call the supply company and give them my anticipated load data adding some for good measure, hang the transformer when it comes in and follow the wiring diagram plate on the transformer following proper wire size for the loads. Hang a buss plug with proper fuses with wires in proper thin wall conduit. Worked for me since I built my building in 1976.

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John T

07-20-2013 04:59:51

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 Re: 480V 3 phase to 240V single phase in reply to Dick L, 07-20-2013 04:22:58  
Yeppers, in our facility the Utility didnt want to provide us with several services, so if 480 was allllllllll we had, we had to do like you and use dry transformers for other voltage requirements. The thing is though those arent super efficient and have high heat losses and all that was OUR EXPENSE NOT THE UTILITIES.

Another thing that isnt for rookies since establishing GroundING Electrodes where needed for the dry transformer outputs and all the proper 480 and/or low voltage grounding and bonding would confuse the Billy Bobs here and they could get someone killed dead

John T

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