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  1. SparksRfun

    Countersinking J-Bolt in a wooden sole plate in residential construction allowed?

    We have a situation where we are installing a modular building system on 2x4 wooden sole plates attached to a concrete foundation. Residential Construction. In this case, if it were a standard framed wall the code in our case would require a J-bolt with a 3" washer plate every so many inches...
  2. SparksRfun

    Resource for design of washer plate connections to wood

    @Dave Atkins, yes we have to check for shear and also for uplift. I am trying to learn how to do this, and do not know how to use the NDS to check for bearing perpendicular to grain. Maybe that is where we need to start? How is that done generally? In general I am attempting to blunder my way...
  3. SparksRfun

    Resource for design of washer plate connections to wood

    I'm looking at determining the strength of a bolt with a washer connecting a wood bottom plate to concrete. Code in high wind or seismic areas typically dictate a square steel plate of a certain size in some cases. What resource (charts, formulas) can I use to find the capacity of such a...
  4. SparksRfun

    Draftsight - a few simple questions

    Just learning Draftsight. A review of the help screens and exploring the interface didn't reveal the answers to these questions, which probably means I am using the wrong search terms, or it's buried in there somewhere I didn't know to look! First - most CAD people now are using two monitors...
  5. SparksRfun

    Seismic requirements for electrical plans

    This puts me in a rock-and-hard place position. I am not a structural engineer. Don't know doodly squat about anchorage and bracing. If I put those things on my plans, I'm not only stretching my stamp where it doesn't belong, I'm risking the pipe supports will fall down, since I don't know...
  6. SparksRfun

    Seismic requirements for electrical plans

    We are going to start working on some projects in seismic areas. I am not clear what kinds of details are usually included on electrical plans in these situations. In the past, in some cases we would require the contractor to hire a licensed structural engineer to do calculations for...
  7. SparksRfun

    Stainless Steel Electrical Panels in Surgery: Required?

    OK, I am in the US, and we are working in Oklahoma. (You can draw your own conclusions as to whether any of us are hillbillies....:) ) However, I think this panel should be stainless, and I'd rather not use anything else. An Architect, who may or may not know any better, wants to try to...
  8. SparksRfun

    Grounding an ungrounded delta

    Corner grounded delta systems are common in old industrial facilities around St. Louis, and they are a nightmare. My recommendation on corner grounded delta is to bolt all three phases together and hire a monkey to throw the main switch! But seriously, you'll have nightmares with corner...
  9. SparksRfun

    Stainless Steel Electrical Panels in Surgery: Required?

    Our normal practice is to use stainless steel fronts on electrical panels in surgery suites. We have a 150A disconnect for a machine that has to go in a Cath Lab, which we've been instructed to treat as if it is a surgery area for design purposes. However, designing this item in stainless...
  10. SparksRfun

    CEM Test

    Does anyone have any recommendations about CEM practice tests. The AEE has one for $80, but it has one and only one very bad review on the web. Not much of a recommendation. Has anyone taken the CEM review course from Vantage...
  11. SparksRfun

    Operating Rooms - Emergency Lighting

    Here is a link to a Veterans Administration Design Guide that calls for 50% emergency, 50% normal and one fixture on battery backup. It's on page 4-7 paragraph 4.6.12. I've used VA design guides before as crib notes to determine best practices. I am not working in a VA facility, just looking...
  12. SparksRfun

    Operating Rooms - Emergency Lighting

    Is there any requirement in the NEC or NFPA 99 about emergency lighting percentage in operating rooms? Our practice has been to include 50% of the lighting on emergency power, 50% on normal power and 100% of medical task lighting on emergency power. (We also provide some lighting on battery...
  13. SparksRfun

    non-hazardous area adjacent to Division 2 classified area

    We are working on a project with a small engine shop located in a corner of a large highbay warehouse. I finally argued the architect into putting a fire-rated wall around the engine shop, pointing out that it falls under NFPA 30A repair garages, and gasoline could be spilled, making it a...
  14. SparksRfun

    Testing LIM panels

    A hospital is asking about equipment for testing Line Isolation Monitor (LIM) panels. There should be a portable meter that measures total leakage, and also a dummy leakage load that simulates leaky equipment. I haven't been able to locate a manufacturer for this test equipment, and the usual...
  15. SparksRfun

    208 v 480

    Jraef Sez >Just out of curiosity, what was the 4160V for and why is it going away? Usually that would have been for the HVAC chillers and if they are really big you may not want to go 480V. This building has a separate energy center on another service, so no chillers in the building. The 4160...
  16. SparksRfun

    LIM Panels (Again)

    >Two transfer switches. Thanks! And your reasoning would be? Any codes that say you CAN'T do this?
  17. SparksRfun

    LIM Panels (Again)

    Operating rooms typically use Line Isolation Monitor (LIM) panels for power because they are wet locations. I am working in an operating room that is definitely so, the nurses tell me it is routinely wet during procedures. It has a single LIM panel on critical branch power. They've outgrown...
  18. SparksRfun

    208 v 480

    >Will you use any of the old distribution? If so is it rated 600V wire or the 250-300 stuff? -ItSmoked No, "Smokey", I'll be picking out particular loads and running new feeders to them, from new panels scattered throughout the building. The new stuff, whether it is 208 or 480, is requested...
  19. SparksRfun

    208 v 480

    I have a fairly large building that is currently wired all with 208V, because the wiring was done probably int he 1950s. If it were being wired today, it would certainly use 480v distribution. THe building is 500,000 sq ft on 4 floors, and several of the floors have 20' cielings. That doesn't...

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