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To Paul Dackerman: Contact me off-list! Regards, Phil Corso, PE Boca Raton, FL [[email protected]] ([email protected]) {[email protected]}

Responding to Anonymous' Tue, Feb 25, 5:21pm query: Protection is considered in order to minimize radiated and conducted "noise" when the contact in question controls an inductive load! The most severe condition occurs when the current to the load is interrupted. Protection, however, it...

Reuben, I apologize for misinterpreting your query! Unless, of course, you are able to fit a front-end loader amongst the piping and vats in a pharmaceutical operation. Regards, Phil Corso, PE (Boca Raton, FL) [[email protected]] {[email protected]}

Is this a new or existing installation? Regards, Phil Corso, PE Boca Raton, FL [[email protected]] ([email protected]) {[email protected]}

Wow Dave, you must have been, or are, or will be... a lawyer! ...I'm sorry Paul, but you had me so discombobulated, I called you Dave. Ergo, you are a lawyer... although you rite like a injuneer! Regards, Phil Corso, PE Boca Raton, FL [[email protected]] ([email protected])...

Bob, I may have spoken too soon, in generalizing. My recollecion is that the article was in the: "Florida Board of Professional Review", published in early 2000" I apologize for putting you on "high" alert! By the way, the "As-Built" issue came about because of a requirement from a...

"Drawings of Record" Regards, Phil Corso, PE Boca Raton, FL [[email protected]] ([email protected]) {[email protected]}

I believe it is no longer legally-correct to use the term "As-Builts" Regards, Phil Corso, PE Boca Raton, FL [[email protected]] ([email protected]) {[email protected]}

Don't forget the most sought-after system of all "production safe!" Regards, Phil Corso, PE (Boca Raton, FL) [[email protected]] {[email protected]}

Responding to Mike's Thu, Feb 13, 9:48pm, comment: Sorry, but I disagree! If the wye-point of wye-delta motor (used for starting) is intentionally grounded, then upon transfer to the delta configuration a line-to-ground fault would ensue. I believe that jatinder was referring to a...

Responding to jatinder dua's query. Very unusual. Can you supply additional detail. Regards, Phil Corso, PE (Boca Raton, FL) [[email protected]] {[email protected]}

Responding to Subodh's Thu, Feb 6, 3:3pm query: Please do not take offense at what I'm about to say, but... this is the perfect example of "catching the mice and letting the elephant's free!" The Benefit-to-Cost Ratio (BCR) for the method proposed is nil. Instead, look for ways to improve...

In my experience, the single most important (robust?) step is the sorting/selection of waste. If your front-end loader operator has that ability, then, double his/her salary! Regards, Phil Corso, PE (Boca Raton, FL) [[email protected]] {[email protected]}

Responding to Fullwave's query: 1) The voltage value you show, 480/240 is not indicative of a 3-phase system. Perhaps you meant 480/277. 2) The three phases (eg, A,B,C or R,S,T etc) of a 3-phase system are 120 deg apart. 3) If by 180 deg out-of-sync you mean the displacement between two...

You're probably aware of the "perceived" benefits of ungrounded systems as well as their problems. If I'm wrong in the preceeding statement or the following scenario, please correct me: I presume that you are considering ground-fault protection to automatically: 1) remove the faulted...

Responding to Pascal Poirier's Sun, Jan 19, 6:49pm query: I'm not quite sure of my interpretation of your query. Please confirm or clarify: 1) Doe this capacitor bank "control" system power factor? In other words is it switched daily, weekly, monthly, or rarely? 1) Do you want...

Further to my earlier response listing (7) questions needed for a qualitative analysis: 8) The VVVF transfer to DOL CB method is not recommended. A hazard exists any time reduced voltage starting is used for large motors, and the starting sequence includes a period when the motor is...

Responding to Parish's Sun, Jan 19, 1:52pm query: It may be possible to do away with switchover and use just one breaker as the DOL starter. Several of the more important questions for a qualitative analysis are: 1) What is capacity of upstream supply transformer? If unknown, then...

Responding to Paul Burke's Thu, Jan 16, 5:29pm, reply: While the approach will solve the problem, I must caution against its arbitrary use. AC plug-to-stop could, in the long run, have a deleterious effect because of an unanticipated increase in duty-cycle. Thus, NEMA type, insulation class...

I'm not sure of your query: Is it your intent is to replace the Y-D starter? If so, use the soft-start with the delta connection.. Then, there is no reason to reuse the existing starter. Also, uncoupling the load duing start is unnecessary. One precauion. Make sure that the resultant...