480V Mains and 208/120Y and 230V Dist

[alphabraxon]

Commercial client Im working with [see previous post on 20 ton bridge crane] is using 480/3/60 for crane, lathes, milling machines etc. Will use 208/120Y transformer for office supply, AC etc. My question is, some of his equipment is clearly marked 230V 1 phase. Would i need a second transformer for these peices of equipment? Can I buy a 220/127V Y dry type transformer? dont see any on Square D or other manufacturers web sites.

Thanks for the help.

 

[bsh]

Some of the equipment may also allow the use of 208 single phase. If not you can use a buck-boost transformer to step up the 208V to 240V

 

[jim dungar]

Can I buy a 220/127V Y dry type transformer? dont see any on Square D or other manufacturers web sites.

Thanks for the help.

The correct nominal voltage would be 240Y/138V. You can find these in the "drive isolation" transformer sections of most manufacturer's literature.

 

[alphabraxon]

Ok here goes. Im doing 480V 3 phase to 208/120V Y with transformer. Will use the 208/120 to feed office equip. AC's, office lights etc. Would also use this power to supply 208 V [welders etc] and 120V for genral task lighting and hand power tools [grinders, drill etc.].

My problem is that the customer has some equipment [pressure washer with steam] that is clearly marked for 230V 1 phase power supply. some of the larger stationary welders have a range of inputs from 208 V upward so thats not a big deal.

I have to assume that somewhere along the way more equipment marked for 230V will be used.

Do I or should I just install a second transformer with its own distribution panel at 3 phase 3 wire for all the 230 volt loads?

Help!

 

[jim dungar]

I have preferred using buck-boost transformers when the number of loads is few and they are located in different locations.

 

[petersonra]

I have to assume that somewhere along the way more equipment marked for 230V will be used.

Do I or should I just install a second transformer with its own distribution panel at 3 phase 3 wire for all the 230 volt loads?

Help!

There is no way to know for sure if this is going to ever really be necessary. I'd be inclined to use the 208V with a transformer at point of use to get 230V to feed a single piece of equipment.

Small buck boost transformers are not real expensive. certainly much less expensive than a whole new distribution system.

 

[LarryFine]

Do I or should I just install a second transformer with its own distribution panel at 3 phase 3 wire for all the 230 volt loads?

That's what I'd do - separate transformers. I wouldn't want my office electronics and lighting on the same transformer as the industrial equipment if I had the option.