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RBulsara: Yes. umrpwr: Thanks.

I need to get a complete Power System Reliability Study completed for a Large Data Center Facility. Can any provide recommendation for an Engineering Firm who could complete this? Is anyone aware of any groups who specialize in Power Reliability Studies?

It is clear now. Thanks to all.

I am to attend a factory short circuit test on a single phase transformer rated 100kV/7.2kV. This specific transformer has an impedance of 10%. This test will be a short circuit test done at rated current. The voltage (kV) that will be applied to the HV terminals is 10kV. How is it...

Has any one recently taken the Electrical and Computer: Power Professional engineering exam? I will be taking it in April 2010 and I would be interested in study materials recommendations from forum users. I currently have the NCEES Electrical and Computer:Power sample questions, the...

rbulsara: My 3rd post was for discussion in response to the post from dpc about paralleling. Reason for my initial post: I discovered and error in an installation. Not my design but my problem. I was looking for valid reason to avoid systems re-work. Proper engineering dictates re-work will...

gentlemen, thanks to all for the input. Matt

dpc: In theory - Two transformers with identical voltage ratings will be connected in parallel to serve a load. The following rating & impedance data are provided: Transformer 1: 1000kVA, Z = 4.5% Transformer 2: 2000kVA, Z = 6.0% The maximum load that can be served (kVA) by the bank without...

Consider (2) transformers, fed from (2) independent UPS systems. The distribution of these (2) individual transformers is accomplished through (2)-42 circuit panels. These panels feed IT equipment with A/B (redundant) power supplies. (A) power supply is tied a panel distributing power from one...

Can anyone provide a reference/starting point in the NEC to the tying of (2) identically sized transformers neutrals together on the secondary. These transformers distribute power through independent panels located in one enclosure and power common IT equipment. I have researched and don’t see...