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Hi Waross, Thanks for such an effort of explanation. In your second last post you mentioned "You don't want the mat to have a good connection to ground Except through the cable connections. The less current that flows to ground through the gradient control mat, the lower the voltage between the...

Thanks Waross, So from your explanation, can I presume that had there been a rubber material that could sustain this weather thing, we might had rubber grounding grids instead of copper. Suppose inside a substation,near a generating station, where normally gen voltage is around 13.8 kV we , use...

Hi, I was given a report which came from recommendation from a electrical contractor, which has Professional Engg. with them about maintenance of a switchgear. One of the recommendations was put a "Rubber-Mat" in front so that a person could stand while a person is operating a breaker. Now...

Thanks for the replay David beach. You might be right, I have things backward. After reading and recollecting , what I have been taught about Harmonics, Load cannot be a source of any power, It is the switching mechanism that makes the source supply harmonics. am I correct, so if I rephrase it...

Hi david beach, I found a reference of your explanation on Square D website http://ecatalog.squared.com/pubs/Electrical%20Distribution/Low%20Voltage%20Transformers/Non-Linear%20Transformers/7400DB0301.pdf and it advises feeding two panels with separate mitigation transformers with different...

Hi Could you please advise me, what is the role of a instrumentation and control engineer in 1) oil and Gas industry 2)Process Insustry At present, I work in a consulting engineering company, but I deal in only power distribution in commercial buildings same stuff, just keep writing specs and...

Thanks for the reply, but honestly I did not exactly get it. Harmonics reduction, I understand but I am sure as the panels supply single phase loads, so the config. cannot be delta -delta as it will not help for single phase loads, so it can be star-star in case of zero phase shift. But how...

I apologize for stuffing my question here, but I came across some thing similar. I was on a site visit doing survey for the loads. I found a new installation on all 1o floors and it was all new panels supplied by mitigation transformers 600V/120/208V and will be also called an ISOLATION...

Thanks for all the inputs from you guys. I beleive, we should probably make space for having supply from one transformer instead of getting in to complex analysis. Just a quick question here,I was reading an application manual from the cummins power(Gen. suplier), I beleive it is called T-30...

Thanks. Yes it is a emergency genset and one transfer switch will be used. Now this project has been set in motion, so we cannot have two ATS, price is available for one. I have some knowledge about AT switches: "If the transfer switch is of the open-transition (break before make) type it will...

Hi Everybody Me and my sr. engineer during a discussion did not agree on a fundamental law, and I beleive he is correct. But I need a final word from you guys. Plz analyze the situation below. A 13.8 KV line is feeding two transformers in a building. I am not sure of the %Z of the two...

Hi, Thanks for your comments, suppose some day, I want to use this generator in parallel with utility. Then here what I think I would do. At present in case of emergency generators, neutrals are not grounded at generator location, they are connected to utility ground by connecting to transfer...

Hi The discussion started between me and my sr. engineer on the selection of a transfer switch. It was for a emergency genertor and the some part of load is lighting and computer and rest is HVAC load. THe gen is around 1 MW diesel gen. He advsied that we should use automatic delayed transition...

Hi Guys, I beleive it is not a difficult question, yeah might be stupid one...... Would appreciate reply. Thanks

Hi I got a catalouge from G&W electric but the guy who gave me was a sales guy. I have just started as an engineer. The catalouge talks about this switch in this link below: http://www.gwelec.com/pdfs/app_guides/appguide5.pdf Should I assume these days, Switches is the term that is being used...

Happy New year 2006 to all the members, who read and reply. Here is my question. I know the answer but just want to make sure if I am right. In case of a single phase pad mounted distribution transformer, there are three fuses. I want to make sure what I know, is it correct? The first fuse is...

Hi Alehman, More on interlocking mechanism, This is what ESA wrote: *********************** " Note: Rule 36-204 and Bulletin 36-17-0 require customer owned overcurrent protection ahead of all privately owned station equipment." ************************ Engcan: This simply means I beleive when...

Thanks Alehman and Buzzp. Here is more on my question #1. What I am trying ask is, if a 15 A breaker connected line to neutral and comes across a line to ground fault on a 240 V single phase supply. Will the ground fault draw enough current to trip the breaker? I am asking this question...

Hi Gurus, I woulds appreciate a moment from you guys for answering these questions. Thanks

Hi Everybody Happy Holidays ! Here are my two questions; Q#1, I am a new start in this area so while specifying the rating of a 120 v panel some thing flashed in my mind. we have a 3 ph supply of 416/240 v and then a 500 VA 240/120 v transformer is connected to a 15 A breaker on this 416/240...