I don't change any setting in the breakers and it is strange that some breakers have M.F>1 (like CB6 and CB7) and some have M.F.=1 (like CB11 and CB9)
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Guys,
ETAP SC report has Symm KA rms and Adj. Sym KA rms and it uses M.F which,
Adj. Sym KA rms = M.F. x (Sym KA rms)
I am wondering how ETAP calculates M.F. ?
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Guys,
I have an ATS data sheet and wondering what is 100KA? Is this the current that ATS can stand (not interrupt) for no more than 0.05 second?
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Yes, I mean what is the typical way to get the acceleration time for a motor?
Is it just simulation or running it under load or data sheets or curves should have this information?
An investment in knowledge pays the best interest (Benjamin Franklin).
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Guys,
Is there any way to tell how long it is going to take for an induction motor to start?
I know there are thermal and other curves for motors but I don't know if any of them tells the starting time of the motor ...
An investment in knowledge pays the best interest (Benjamin Franklin)...
Thanks,
After talking with CDEGS, I just modeled rebars (not concrete) and it solved the problem.
An investment in knowledge pays the best interest (Benjamin Franklin).
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Guys,
What is your suggestion for decreasing the touch potential on the pump room (lower right)?
I have 4 ground rods (one in each corner of the the room) and it still shows a high touch potential.
I have added lots of copper and rods on other parts of the grid and adding more, looks a little...
Guys,
I am trying to connect the grounding conductors in tray to the ground grid in CDEGS but because of different elevations (and may be different environment (soil and air)) I can't connect the conductors.
Am I missing something or CDEGS only models underground conductors?
An investment...
Guys,
For ground cable sizing of MV services, should I use Table 250.122 of NEC?
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Bill,
I don't know how many banks of fans are installed.
Does that effect anything? (should I consider redundant Banks etc.?)
An investment in knowledge pays the best interest (Benjamin Franklin).
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Guys,
I have a main transformer with the rating of 12/16/20MVA (KNAN/KNAF1/KNAF2).
My final load list shows 14MVA now. I know this transformer can handle that but how bad is to have normal running loads more than the base rating of transformer? (in my case 14MVA which is more than 12MVA)...
Bill,
Considering any imbalance current component (either from imbalance load or fault) goes to neutral wire, how putting 4 wire inside the CT will work?
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Guys, my understanding is if we have one CT around all 3 phases (to measure the residue), ANSI calls this as Zero sequence or G(round) CT and if we have one CT around neutral wire, ANSI calls it N(eutral) CT.
If the above statement is correct, what are the applications of each?
Guys,
I am trying to protect the following pipe against lightning. What is your suggestion?
1- To put air terminals every 50ft along the pipe
2- Using static mast at both ends of the pipe and running a wire along the pipe?
3- Any other suggestion?
Hi Guys,
Running a short circuit on UPS system, I noticed short circuit current in UPS output is much less than SC current in input.
Am I missing something or it is always the case?
