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Deep... I once presented a Power-Point Presentation at an HPI Conference on Risk Management of SIS systems. It contained specific DOs and DON'Ts related to color-coding! If you are interested in a copy, contact me on or off-list. Regards, Phil Corso (cepsicon [at] aol [dot] com)

Zmungo... I suggest you search the Control List archives for thread # 1026248769. Regards. Phil Corso

Speedtronic... this type of query can be answered in three words... detail, detail, detail. Pegards, Phil (cepsicon [at] aol [dot] com)

Dschmatzhagen... Feedback? Phil Corso

Danko... was your problem resolved? Phil Corso

Responding to Shafiq's 27-Apr-10 (12:48) query...please provide additional detail. For example, the nameplate ratings of each transformer, the actual voltage and ampere measurements, and lastly, are they connected in parallel? Regards, Phil Corso (cepsicon [at] aol [dot] com)

Tauck... can you provide some detail regarding bus-dimensions, material, voltage, and if plated? Regards, Phil Corso (cepsicon [at] aol [dot] com)

I believe there are at least 4 additional questions that must be addressed: 1) Do you need 415V for LV loads other than the auxiliary-service requirements for each gen-set. 2) The weakest link regarding system reliability is the lone 11kV/415V transformer. 3) Earthing requirements of...

SSV... I suggest you get a copy of the Power Magazine "How to" article published in their May 2006 issue! Regards, Phil Corso

Ragu, I suggest you post a new thread. Provide detail additional detail like design vs operating permiters. Also include condition of operation... isochronous operation; parallel with another alternator; or in parallel with larger network (grid). Phil Corso

Sam... I suggest you search the Control List's Archives. There are a few topics on reversing direction of single-phase motors. If the search proves inadequate to suit your needs, then contact me! BTW, the answer to your question about using relay's is... yes, but there are some caveats...

Following is the definition provided in the ELECTRICAL APPARATUS SERVICE ASSOCIATION's (EASA) May 2010 Publication, by Tom Bishop, EASA Senior Technical Support Specialist "We will begin this article by clarifying the terms “alternator” and “generator.” Both terms refer to a machine that...

Antonslark... have you given up? If not, can you provide the nameplate rating of the original heater, that is 3-ph kW, Line-Volts, and Line-Amperes? Regards, Phil Corso (Cepsicon [at] aol [dot] com)

Replying to Atonslark's 26-Apr-10 (08:30) query... the total power taken by the heater is: Total P (Watts)= Vab x Iab + Vbc x Ibc + Vca x Ica, where: o Vab, Vbc, and Vca, are the line-voltages, and o Iab, Ibc, and Ica, are the delta-currents. o Heater PF is assumed to equal 1.0...

Responding to Vinod's 24-Apr-10 (08:22) query... Yes, if you follow the usual rules! Regards, Phil Corso (Cepsicon [at] aol [dot] com)

Naresh... are you asking if a metering-type CT could be substituted for a protection-type CT, then the answer is NO! I suggest you search the Control.Com Archives for a more definitive answer to your question! Regards, Phil Corso (cepsicon [at] aol [dot] com)

Dschmatzhagen... the measured values result in Voltage-Unbalance-Factors (VUF)of 0.48%/0.50%. The first number is based on NEMA; the second, IEC. The corresponding Ampere-Unbalanced-Factors (AUF)are 7.2%/7.3%! However, before any meaningful conclusion can be reached, it would be helpful to...

Yusuf C... the calculation follows: Referring to the vectoral addition Vab = Van-Vbn = Vrms(1.5+j0.866) yields SQRT[3]Vrms@+30Deg. In other words, for the sequence ABC, Vab leads Van by 30Deg, and Vrms is phase-to-neutral voltage. FYI, phase-to-phase voltage is often referred to as...

Kapil... are you referring to Mani's or KDX's situation or is your situation different? Phil Corso (cepsicon [at] aol [dot] com)

Responding to Imran Ali's 13-Apr-10 query... I suggest you start with a search of the Control.com Archives. If you are unable to find what you want, then feel free to contact me. Regards, Phil Corso (cepsicon [at] aol [dot] com0