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  1. Shavner

    Building interconnections for RF Systems

    I am working on a job that is replacing an antiquated McCollough loop system with RF transcievers. This is a large site with storage warehouses. Is there a distance limitation to interconnect multiple buildings (FACPs) to a single Transmitter in NFPA. I have been thru both 70 & 72 and cannot...
  2. Shavner

    ARC Fault C.B. and a funny smell

    I have a question about AF C.B. I have a customer (8 yr old >$1 mill house) that is smelling a buning odor in his bedroom and I belive it may be a low level arc either in a device or in a wire. I've suggested installing Arc Fault breakers on the circuits that feed that room to determine if...
  3. Shavner

    RF Fire alarm reporting

    Well the existing systems in about 103 buildings on site vary from new panels and KF trancievers to 40 yr old monaco, Mcollough loop. The scope of this job is to bring the existing non-RF reporting buildings on line and look compeditivly at possible systems for replacing the dispatch center...
  4. Shavner

    RF Fire alarm reporting

    I'm working on a design for a base wide RF reporting system for fire alarm. They have existing an old Monaco, Mcollough loop system and a king fisher RF system. I'm trying to find a reliable system to use that can replace the Monaco system and incorperate the king fisher system and be...
  5. Shavner

    RF fire alarm reporting

    I'm working on a design for a base wide RF reporting system for fire alarm. They have existing an old Monaco, Mcollough loop system and a king fisher RF system. I'm trying to find a reliable system to use that can replace the Monaco system and incorperate the king fisher system and be...
  6. Shavner

    Recommended Readings

    I agree with ralph, If there is a contact available to obtain documents from the manufacturer that is the best. BUt since you are not an engineer are you looking for maintenance informaition? THe NFPA 70B "Recommended Practice for Electrical Equipment Maintenance, 2002 ED" is very usefull for...
  7. Shavner

    Lighting Contactors

    The main reason is controling multiple circuits of differing voltages with one single switch. On a single 120V switch circuit you can use contactors to control 277V fixtures without having to opperate the breakers. And for the user, most non electrical people don't feel comfortable going near...
  8. Shavner

    Underground Transmission in Europe

    I've had some experience in eastern Europe, Lithuania, Estonia, Latvia and down in Moldova and yes the "HV" is underground most common is 11kv distribution to largeer sites and also the usage voltage (380/220) in lithuania is loop fed thru various transfer switches in different buildings with...
  9. Shavner

    AutoCAD and Tablet PCs

    Big Help Thanks. I was however looking more for a survey tool... Something I can take out in the field and do rough drawings instead of paper and pen but rather straight to CAD.. Again nothig spectacular for finished product. just dimentioned lines, rectangles and rough text boxes. also to view...
  10. Shavner

    AutoCAD and Tablet PCs

    I'm considering purchasing a tablet PC and am wondering if Autocad 2002 can be supported with use of the stylus instead of usual mouse cursor. I know that other software supports the writing (like a PDA) and before I spend the money I'm trying to find out any information on the CAD uses. Also...
  11. Shavner

    MV cable buried uphill

    What bout providing a messenger cable burried alon with the cables and securely anchored at the top of the slope and allowing some snaking in the power cables. I belive that the required depth of installing the MV cables IS going to place a lot of strain on them from not only the slope of the...
  12. Shavner

    LIGHTINING PROTECTION FOR HAZARDOUS AREA

    Sorry was typing too fast - 100' RADIUS sphere - And cost can play an important role in the system chosen either a free standing system or a catenary
  13. Shavner

    LIGHTINING PROTECTION FOR HAZARDOUS AREA

    As Stated NFPA 780 - Ch 6. gives excellent coverage on the subject. The use of lightning masts is an excellent way to address these problems. The question I have is the Height of the structure in question. For rough estimating a 5200ft2 (480M2) building with a max height (salient Plane) of...
  14. Shavner

    problem loading drawings...AECBase...????

    Forgive my ignorance but I don't quite understand what you posted... We have ACAD 2002 and I think some people are using Arch. desktop. This was also posted to our in house Cad person and she can't figure it out either.
  15. Shavner

    problem loading drawings...AECBase...????

    Ok, I turned off the ARX in the options menu and turned off proxy graphics and the dialogue box, however now my custom commands don't work and my ACAD is bogging down on the simplest command in a new drawing with only two lines.... any other sugestions?
  16. Shavner

    problem loading drawings...AECBase...????

    The whole office just switched over to ACAD 2002 and now I'm havng problems loading up drawings that have x-refs... it is not consistant (about 50/50 chance) but when it does happen it can take upwards of 2-5 min to load a drawing. The scripts I get are as follows AECBase... AECArchBase...
  17. Shavner

    Equipment Damage Curves

    Trying to find some reference material on 15 kv switchgear damage curves. I am trying to convince a client to install a partial bus diferential protection and want to quantify the possible damage to the equipment without it.
  18. Shavner

    electromechanical relays

    I'm trying to understand the differnece in operation between a 50/51 and a 67... I understand that the 67 is a directional device and will only operate if current is in the reverse direction. My question...what happens to a 50/51 relay when current is in the "wrong" direction?
  19. Shavner

    lightning protection

    Yes since I first posted this thread I've learned a lot. from what I've seen there are three requirements for lightinig/side flash protection. first is the mast systm, It basically uses a strike radius of 100' which is a 200' round sphere rolled into the side of the building and down from above...
  20. Shavner

    lightning protection

    Main reason is the contents of the buildings. Ordnance facilities require more stringent requirements for direct strikes and possible side flash. Even a little spark could level the building and anything within a few hundred feet of the building.

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