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Kunal, typically standard transformers are allowed in Class I, Div 2 locations provided their accessories are certified for use in Div 2 locations. Following are some of the more salient considerations depending on cooling media: 1) DRY-TYPE: o Enclosure must be non-ventilated. o...

Bhagwan, I concur with Jojo's recommendation that you seek the manufacturer's SOAR... also known as its Capability or Performance chart in some parts of the world. Your 02-Oct-09 requested permissible reactive kVAr loading with a leading power factor. It can be approximated using...

Arvinon... An ESD company I once had provided M of N voting systems for applications similar to the one you described. One particular application was a 3 of 75 voting system to prevent thermal runaway of a hydrogen reactor. Available in software or hardware, they also included options such...

GSA... some detail please: 1) What are corresponding phase-phase voltages? 2) What are corresponding phase-neutral voltages? 3) What are corresponding power and pf measurements? 4) What is the load? Power Electronics like rectification modules? Regards, Phil Corso (cepsicon [at]...

KRA, in answer to the 2nd part of your query... see Control List topic: http://control.com/thread/1232621754 Regards, Phil Corso (cepsicon [at] aol [dot] com)

Vimal, are you interested in knowing how the additional generators will impact: a)Fault-duty. b)Protection requirements. c)Both Regards, Phil Corso (cepsicon [at] aol [dot] com)

Responding to NV Rajan's 03-Sep-09 (03:08) questions... the following Thread may have the answers you seek: http://control.com/thread/1026242921 "Neutral Interruptus!" If you want an example illustrating what happens when the neutral conductor is inadvertently open-circuited, then contact...

CSA... thank you for your kind words. Now, for all to see, attached are two paragraphs from the paper that clearly present my position, which is, "reactive power", an oxy-moron (see List Topic, # 1026236550, "The Physics of... Electric Power") shouldn't be used, but instead, kVAr, should...

CSA... Drill certainly does not have to be concerned about enduring (my) wrath but, instead should fear your ignorance about the term "reactive power!" Drill, just contact me for my paper, "The Physics of... Armature Reaction"! CSA hasn't read it yet, so I'm still puzzled about why he shuns...

Responding to JulesCeasar's 29-Aug-09 (04:54) comments regarding fan "windmilling?" Have you searched Control.com's archives for "anti-windmilling" topics? Regards, Phil Corso

Certainly Mark... great pickup. The 600 million hours referred to the I/O/F count. BTW, "success" means zero unwarranted trips, and always tripping when required! Phil

SonicJoe... send me your email address and I will send you a series of papers covering a patented SIS/ESD System. I will begin with one presented in the "Journal of System Safety Society!" Called, "Probabilistic Risk Assessment of Equipment Safety Systems" for rotating-machinery...

SonicJoe... 1) What is the fuel? 2) How many burners? 3) How many scanners per burner? 4) What is Boiler MFT philosophy? trip on loss of one scanner? One burner? Or other logic? 5) Do you use NFPA Standards? 6) Is your goal to eliminate, yes I said eliminate... not just...

Responding to Harsharmn's 24-Aug-09 (02:58) query... please provide a simple hand-drawn sketch or Single-Line-Diagram to clarify your problem Regards, Phil Corso (cepsicon [at] aol.com)

Responding to Vimal's 26 Aug-09 query... off hand the voltage ratio is too high! A diagram of what you are attemping to do may be more revealing. Regards, Phil Corso (Cepsicon [at] aol/com)

TheBiggestBangTheory... The August issue of the hobbyist magazine, "Nuts and Volts" contains plans for a "Solar Tracker!" Of particular interest to me was the development of a Pointing Vector. (My apologizes to those finding the "V-Word" abhorrent!) Regards, Phil Corso (cepsicon...

Shilpa... I suggest you search the Control List Archives. Regards, Phil Corso (cepsicon [at] aol.com)

Sonicjco... 1) Hot air leaking from combustion chamber, then fire-box is overpressured. I don't believe this is a safe condition! (Once I was bodily carried out of a refinery when I dared comment to ref management that the CO-boiler was being over-fired! 2) How is scanner being cooled? Is...

Shree, a simple test is to compare the 3 stator windings: Connect an LCR on each phase. Start with, say, A-B. Then while slowly turning the rotor one reveloution, in small increments and record the LCR measurement for each increment. Repeat for B-C, and C-A. Then plot the readings and...