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  1. Chenopod

    What ~$20 - $30k 3D printer would you get?

    And why? It's a subjective topic and the choice is weighed heavily by the intended use. I personally don't make large quantities of parts and would choose one that does most of the work for you... I wouldn't want anyone's primary job description to be running and maintaining the machine...
  2. Chenopod

    Actual dimensions of square drive on hand tools

    Had an old copy of the Machinery's Handbook and found it in there woot woot! Thanks everyone.
  3. Chenopod

    Actual dimensions of square drive on hand tools

    I am trying to find the actual dimension ranges for the standard 1/4" and 3/8" square drive that you see on torque wrenches and socket sets. I need both the male drive dimensions and the female socket adapter dimensions. Does anyone know off hand, or could point me to the correct ANSI...
  4. Chenopod

    Choosing switchgear for an arc flash test

    We want to see if the explosion creates a hole in the enclosure at the location where our product is installed. We're not testing whether the product itself causes the arc.
  5. Chenopod

    Choosing switchgear for an arc flash test

    I have one other question to add - IEEE C37.20.7 calls for switchgear that is "fully equipped". Since they leave it up to the manufacturer to interpret this, I'm wondering what components would comprise the simplest possible system. Does this just mean the enclosure(s), bussing, and one...
  6. Chenopod

    Choosing switchgear for an arc flash test

    Thanks. I still could use some help with the specs... Regardless of voltage, we would like to pump 50kA and/or 63kA for 30 cycles at 60Hz because that is what we want the test report to say. If we go with a 480V system, can someone suggest a nominal current rating that wouldn't result in a...
  7. Chenopod

    Choosing switchgear for an arc flash test

    dpc, thanks for the explanation - I did some more digging and found a couple papers explaining AIC vs. short circuit current, which is more relevant to lab-induced arc faults. Zog, our testing will be at KEMA, I'm pretty excited about it. And I am indeed interested in your older used gear. The...
  8. Chenopod

    Choosing switchgear for an arc flash test

    Thank you Zogzog, Overvoltage, this is very helpful advice. I am designing a component that gets installed into a panel of the enclosure. In a nutshell, we want to build a system with arc pressure vents, create an arc flash inside, and see if our component causes failure per ANSI/IEEE C37.20.7...
  9. Chenopod

    Choosing switchgear for an arc flash test

    Hi, I've been asked to spec out switchgear enclosures to do arc flash testing per IEEE C37.20.7. We know the 'arc rating' parameters we plan to use: 5kV, 50kA (or more), 30 cycles @ 60Hz. The arc will be induced by a copper shorting wire between phases on the main bus, at a specialized test...

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