3 phase converter question?

Question

What is the cheapest/most efficient device to convert a delta phase (208) to a 120 volts??

We only have 70 amps ,(#4) coming in through the 120v feeds, and wish to increase the total amperage possibilities,and were wondering if we could transform or convert the 208v to 120v, and what device would be the best to accomplish this?

Answer 1

Lots of possabilities. You need to talk to an electrician.

Answer 2

I think you will find it cheaper to get better service installed than to get a transformer of significant amperage to convert the 3 phase to 120 (unless, by some chance at the edge of my ignorance, each branch is 120 with respect to ground - 208 to each other).  

Is this living quarters?  In your city, like mine (Dallas TX) home owners may take a test to do electrical in their own home under a permit but without a licenced electrician.  I cut the main lines myself (if the power company had done it, it would have remained off until inspected and they put it back) and installed a new meter box and 200 amp service doing a temporary reconnect until inspection and the power company changed my temp to permanent.   You may be able to install new service beside the old or replace the old as I did without full price electrical work.

Answer 3

a transformer would be the only way. not necessarily cheap.

Answer 4

If there are only 70amps coming in you will have to consult your power company. The wire size is maxed out as per the amprage coming in.