Search results for query: *

That is exactly the case, I have to center tap one of the transformers.

Thanks a million. That is the first thing I have heard on this subject that makes sense. I definately appreciate the help....By the time I was done I had called several other engineers I knew at different companies and nobody knew how to do it....go figure.

I had meant to say 'B' phase not 'C' phase....sorry

I have an old building that is getting its power from an open delta utility company transformer. This is giving us 240v 3-phase power. I have been doing some research on this subject and have not come up with a lot of information, what I am wondering is the following. Do I need to avoid...

I am in need of a clarification so... If I use the demand load for things like kitchen equipment and receptacles do I get to use those discounts in sizing my feeders? or do I have to use 100% as in connected load when sizing the feeder? what about breaker sizing? Thanks for any light that...

I think my intent got a little skewed by the way I proposed the question. I am simply trying to make sure that if I give my client what he wants it is not going to bounce back at me at the code level, everything I knew of confirms what has been said in this thread but we had a bit of an...

BJC: This is going to break you heart if you don't already have to deal with it but it has been mandated that all states comply with ASHRAE 90.1 or greater by last June I think. It isn't being enforced strictly in alot of states, and in some, for example Florida and California they have more...

I realize why to use night lighting, My problem is that my client wants to run non nightlighting power as nightlights. I am concerned that there may be some sort of w/sf rule in ASHRAE or something in the NFPA that would restrict this. From what I see it has been left fairly open ended, I am...

I was wondering if anybody knows of any laws governing the placement of night lights in a building (NFPA, ASHRAE 90.1, NEC). We tend to put all of our night lighting on a lock out breaker with our emergency lighting, however, our customer is wanting us to put half of the store on the night...

I was wondering if somebody could answer this for me. If I have a demand load (lets say for lighting) of 125% I calculate my demand and then I go ahead and multiply that total by the demand of 125%. Now if I have a distribution panel that is feeding the panel with the for mentioned lighting...

thanks, that settled a dispute we were having here in the office.

I am wondering if anyone knows what the code says about the distance from a Distribution panel to a MLO only panel, at what point am I required to use some sort of protection device? Thanks, Jason Self

Thanks everyone that clears things up a bit.

Could anybody tell me in 3-phase power when I would use a "3ph/4w/Ground" setup rather than a "3ph/3w/Ground" setup. I am a bit confused as to which I use in a given situation. Thank you, Jason Self