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  1. Thread: CAD issue

    by hmspe
    Replies
    5$$
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    493

    I convert PDF to PNG and insert the PNG. PDF...

    I convert PDF to PNG and insert the PNG. PDF seem to add a lot more overhead and back when I ran Autocad it tended to insert at 72 dots per inch (low resolution FAX quality) and it was very hard to...
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    Load for switchable output level LED fixtures

    Is there an official statement on the correct load to uses for fixtures like the Lithonia CPANL series? The output level switch would not be readily accessible after installation. I understand the...
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    923

    I use Bricscad in my office. Compatible with...

    I use Bricscad in my office. Compatible with Autocad but much less expensive.
  4. What year is the adopted NEC?

    What year is the adopted NEC?
  5. Replies
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    I still use Visual 2.06 and run photometrics on...

    I still use Visual 2.06 and run photometrics on almost every commercial job that goes through my office. The only exceptions are when the client provides the lighting design. Most consultants I've...
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    Questions about electronic demand meters

    Is there a typical scan rate for reading demand? For electronic meters (typically Elster here) is the demand measurement a true moving average? Are motor starting spikes filtered?

    Backstory: ...
  7. I use the method in the Bussmann SPD. ...

    I use the method in the Bussmann SPD. http://www.cooperindustries.com/content/public/en/bussmann/electrical/resources/library/selecting_protective_devices_handbook.html
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    New, open about 6 months. Nothing was on the lot...

    New, open about 6 months. Nothing was on the lot when we were here about two years ago. The code was the "2006 NEC" according to what the ordinance the parish lists on their web site. The same...
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    Based on stepping off distances there should be...

    Based on stepping off distances there should be at least 16 receptacles. There are seven that I can find, including the ones for the coffeemaker/microwave and refrigerators. There is no lighting...
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    It looks like the adopted code is the "2006 NEC",...

    It looks like the adopted code is the "2006 NEC", although the published amendments say that the amendments modify the 2002 NEC.

    Assuming the 2005 NEC is in effect there should be more receptacles...
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    Minimalist hotel design

    I stayed in a new Holiday Inn Express last night. Nice suite, but minimalist design. The main space was about 30' x 16', with the bath carved out in the middle of the long wall. In that space...
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    Thanks for the comments. It makes no sense to me...

    Thanks for the comments. It makes no sense to me that the utility requires that their side of the transformer be wye. This is a 15KW inverter PV system. The utility's concerns seem to be centered...
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    4$$
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    Y-Y step down transformer for photovoltaic system

    A colleague has several new PV sites where the PV inverters are at 480V but the service is 208V. The step-down transformers are 30KVA and the utility has required that they be Y-Y. The PV system...
  14. Thread: Lights & Plugs

    by hmspe
    Replies
    38$$
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    3,666

    See NEC 408.4. The inspector is correct. ...

    See NEC 408.4. The inspector is correct. "Plugs" would also be a problem for me. The definition in Article 100 says a plug goes on the end of a cord and it is inserted into a receptacle.
  15. Thanks for the replies. I generally edit my...

    Thanks for the replies. I generally edit my posts to keep them short and apparently this time I went too far with local terminology when editing.

    By service I mean the switchboard which...
  16. Are fused switches used as service disconnects required to be lockable?

    Possibly by UL 891? This is in reference to a transformer feeder per 2011 NEC 450.14.
  17. Replies
    16$$
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    I respectfully disagree. A squirrel cage motor...

    I respectfully disagree. A squirrel cage motor does not use permanent magnets, but has rotor bars that are shorted together with a ring at each end of the rotor. See...
  18. Thread: Feeder Sizes??

    by hmspe
    Replies
    16$$
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    1,864

    My standard spec is all copper, but contractors...

    My standard spec is all copper, but contractors frequently ask for approval for aluminum due to the cost difference. I generally approve the change for all but the EGC. I've also seen plans from...
  19. Thread: Feeder Sizes??

    by hmspe
    Replies
    16$$
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    1,864

    Not sure I agree. I spec aluminum for phase...

    Not sure I agree. I spec aluminum for phase conductors frequently, but the EGC is always copper.
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    ... and after I got one of the ballast channels...

    ... and after I got one of the ballast channels down on the ground I found that the buttons do push in. Significant difference between working on a hard surface and working on fixtures in the air...
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    3,392

    Here's what the connectors look like. It would...

    Here's what the connectors look like. It would make sense that the buttons next to the wire would be press-to-release, but we've tried pushing, pulling, and rotating and they don't move, at least...
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    3,392

    They are Universal P254PUNV-D ballasts. Factory...

    They are Universal P254PUNV-D ballasts. Factory installed so no tools or instructions, and nothing of use on the Universal web site. The fixtures are old enough that the do not have internal...
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    3,392

    Engineering office. Both are students (one high...

    Engineering office. Both are students (one high school, one college) in training so the term fits.
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    Thanks. We had a ballast fail this morning. ...

    Thanks. We had a ballast fail this morning. These are Peerless linear in rows 16' and 20'. I ordered single lamp fixtures but received two lamp. When a company is nice enough to provide...
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    21$$
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    3,392

    Removing wires from T5 ballast

    I have Universal brand T5HO ballasts in my office. No instructions on how to remove wires from the orange connectors on the ballast, and nothing I've tried releases the wires. Is there a trick to...
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