Step Down 240V to 208V

You have two hot legs and one high leg (Power leg, wild leg, or stinger). And one neutral. I prefer power leg. If I were to change out your service, the first thing I would do is check rotation at the service entrance with a phase sequence indicator and write it in the panel. Marking the position of the hot legs with an H and the power leg with a P and a CW for clock wise or a CCW for counter-clock wise. Also the date and my initials. I would check it again after I changed out the service, before I told the customer he could close his main.

If you have an Open Delta bank, you have true 3 phase. This connection is relatively inefficient where three-phase loads predominate since it has only 86.6% of the rating of the two units making up the three-phase bank. It also has only 57.7% of the three-phase rating of a closed delta bank of three units.

Don

How do you center ground a delta?

Wes

I do not consider my Open Delta a true 3ph, as only the wild leg is

120 deg out of phase with the others. Although I'm sure it's better than the old rotary phase converter I had.

Thank You, Randy

Remove 333 from email address to reply.

Randy you should go to

and take a look at the Open-Wye Open-Delta 120/240V at the bottom you will see phase angels and they are all 120 deg apart. You will see one side of the delta is gone but a,b & c phase are 120 deg apart. That Open-Wye Open-Delta 120/240V bank I show there has a 210 deg angular displacement.

Don

Hi Group,

Thanks for all the informed replies to my question. I contacted Blodgett, the oven manufacturer and they said that replacing the heating elements would be the way to go.

I did learn an lot about delta and wye 3 phase from your replies!

Chuck