Recent content by Ares

I belive the impedance and capacitance to ground of the long line results in some sort of resonance with output filter. Isolation transformers "a delta primary star secondary transfomer on the output of the drive" should solve the issue. I would connect the shield of cable to that transformer...

You may donload a free software (Ampacity Calc.) that calculates the derating from http://www.mc-group.ca/download.htm

Proper solution is to use 2000A rated bus. 3 runs of 600MCM would produce voltage drop over 5% and I do not think any arrangment would provide the ampacity you need. Check Underground Ampacity calculator @ http://www.mc-group.ca/download.htm It is for U/G but shows cable configurations - there...

Does any of you use the Autodesk Building Systems for Mechanical/Electrical design. Does the system work in real life? I will appreciate info from M&E designers who tried or is using it. Thank you

Celeron and the low cost version of Athlon do not have so called math coprocessor which is vital for ACAD.

Does anyone know where to find lisp that draws ceiling grid - like 2'x4' within a selected entity? Thx

Once you select TIF as a printer go to properties (in PLOT dialog box) and set custom resolution as large as you need to get your dpi. I do not now of any limitation the higest I needed was 1600x1200 pixels

Thank you, The pre-programmed speed - selected by an contact closure is all I need.

During power outage when a 40 HP fan (on a VSD) is on emergency supply I would like to limit its power consumption arbitrarily to 25% nominal to avoid the generator overload. What is the best, foolproof way to do it?

Create custom icon and use this Diesel string ^C^C_ai_molc;\_-layer;_off;*;;; it turns all but selected layer off. experiment with freeze but you may not be able to freeze the current layer, unless you change the "selected" to "current" first - can be done.

You may want to check software from http://members.rogers.com/mcgroup/download.htm Or just download http://members.rogers.com/mcgroup/Uground.zip It contains tabulated ampacity values for different feeder sizes configurations, plus ambient and cable temperature rating correction factors that...

PS The voltage drop calc from the same site is exceptional http://members.rogers.com/mcgroup/download.htm

Try lighting calculator from MC Group http://members.rogers.com/mcgroup/download.htm It is very fast, but no frils. You may try it without registering. There is also some usefull freeware there

Peebee comments are right on Additional considerations should be: -Wet cell usually fails by shorting, failure not trivial to diagnose and may lead to catastrophic failure. -Wet cell may short the UPS electronics if system is not floating (isolation transformers on input and output. -Wet cell...

>Ampacity rating of cable in free air, above grade >conduits with Ambient temperature & corresponding >correction factors Try FREE Ampacity Calculator from http://members.rogers.com/g.cygalski/download.htm OR http://www.execulink.com/~cygalski/download.htm If you like it you will also like...