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Thanks, that clears things up.

i guess neither, H1-----+ +--------- Load > < 240 > < 120 transformer 1 > < H2-----| | | | | | H1-----| | > < 240 > < 120 transformer 2 > < H2----- --------- Load 480V connected to H1 of transformer 1 and H2 of...

are you calling this parallel? H1----- --------- > < 240 > < 120 > < | | ---+ +--- | | > < 240 > < 120 > < H2----- --------- I would call this series, since H1 and H2 are 180 deg out of phase? So why don't the...

------- --------- > < 240 > < 120 > < | | ---+ +--- | | > < 240 > < 120 > < ------- ---------

So I'm confused. What would the KVA and total Z% be?

I was visualizing 480v into the primary with two connected in series. This would mean 240v across the secondary and 120 across each of the secondary windings. Wouldn't the total z be 10%?

Why isn't Z% additive? I thought it was a per unit value, so it would add?

Say you have two step down transformers (240v/120v, Z=5%) wired in series. Will this make total Z=10%? Then actual Z would vary by a factor of 4 (due to the different voltages)?

Wow, thanks. As you can tell, I'm new to this SKM. I was under the false impression that you had to buy the unbalanced module. So what does it do for you if you buy that?

Thanks, dpc. No we haven't bought the unbalanced/single phase module. So I was trying to investigate how to convert from three phase fault current at the bus to single /phase to phase.

I used SKM to generate three phase available fault current. Now I want to use something else to find single phase fault current and arc flash info. How do I convert the three phase available fault into single and phase to phase available fault current. I intend to use this info to plug in to...