How many 1000 watts ballasts can be connected from a 25 kva transformer?
- Thread starter augusto1
- Start date
Transformer is Dual Phase ( 120v 120v and one neutral conductor ). Thanks
Yes, I will be conecting directly to the transformer and it is being use for one house only as there isn't any more house built around yet. Thanks
I don't have that info with me as the transformer is on a post, it has a Big 25 on the middle of it. Thanks
Where did you get that info? I believe that you misundestood the concept of the thread. Thanks
The house is already wired up from that transformer but I am going to do the wire up for the grow rooms, that's why I want to make sure how many 1000 watts lights can be connected to avoid present or future problem with the transformer or the electrical company due to over load or burn it out . Thanks I really appreciate all your helps
PICOGRAV
Well-Known Member
The main concern is not really going to be the actual transformer, but the wiring installed. You need to find the first breaker point after the transformer and figure out what amperage was run there, it could be 100 amp 200 amp maybe 300 amp, single or dual? The actual transformers are very solid and will easily handle 140% of the rated loads, they are much more efficient at there rated loads because of the current saturation around the coils.
It wont matter if you have 100kva transformer, you will have to look at what the inbound lines are rated for. At a minimum I would say they did 100 amps per phase to your house which will give you about 10-11 lights per phase safely. I would look at the amperage of the service from the transformer as what to work off of.
I checked and there is a dual main breaker with a 150 on it, so I have to work on base of 150 amps, thanks to your helps I got a very clear idea. Thanks
In this case, it means that there are two 120v feeds coming off of it. A single phase only has one 120v. Your outlets in your house are single-phase. Dual-phase is where you get 240v across the two hot feeds, or 120v across each feed and the common/neutral wire. This allows you to distribute your gear across the two phases, effectively splitting your current draw in half across each feed.
-spek
In the United States the typical residential step down transformer is referred to as "single phase 240 volts with a center tap" because the input (primary) winding is being supplied by a single phase from the power distribution grid. The output (secondary) winding is center-tapped and the center tap is referred to a grounded neutral. The two halves of the secondary windings are 180 degrees apart with respect to center point and thus are referred to as "split-phase". http://upload.wikimedia.org/wikipedia/en/2/29/Split_phase2.png
SnapsProvolone
Well-Known Member
The whole asking about transformer capacity w/o caring about main breaker / disconnect / feed sizing very much sets off my power thief-o-meter. Don't get caught by blowing that xfmr.
SnapsProvolone
Well-Known Member
Sad part is his 150 amp breaker, even at 80% pf is 28.8kVa. You can't look at a residential service as being rated for continuous but intermittent. Duty cy cc le of transformer as well as its efficiency also factor.