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  1. cmlr

    Profibus Problem at MCC

    From the information you provide it could really be a number of problems. The specifications for the physical layer of a Profibus network are very strict, and if any of the requirements is not followed it could lead to problems. To start you may want to make sure all components (including...
  2. cmlr

    MIXING PNEUMATIC AND ELECTRIC INSIDE ENCLOSURE

    If you are located in the USA and want/need to UL label the enclosure you may want to confirm with your UL inspector though. I am working on some enclosures that combine electrics and pneumatics. Our client requires a NEMA 4X rating, but UL508A states that penetrating the enclosure with a...
  3. cmlr

    UL labelling a panel with just two transmitters

    Hi all, We are a UL508A workshop, and we are currently building several bubbler panels that contain mainly components such as pressure gauges and regulators (and teh associated tubing of course). However, since we are also installing two transmitters (Yokogawa EJA110A) in the panel our UL...
  4. cmlr

    Anodizing type 304 stainless steel

    Hi all, I am a control systems engineer, and have no knowledge of material engineering whatsoever. We are currently working on a project for a water treatment plant where all control panels have to be made from type 316L stainless steel. Even though type 316L enclosures are widely available...
  5. cmlr

    "Unrated" vs. NEMA 1 rated enclosure acc. UL50

    We are a panel builder, and our client requires us to supply some panels that are rated NEMA 1 according to UL508A. However, the actual enclosure they specified does not seem to be rated at all. I am wondering if we can actually rate the enclosure without testing it according to UL50. Is there...
  6. cmlr

    Open query using parameters in MS Access

    Hi all, I'm a Control Systems Engineer with not much experience in database programming, but I am trying to create an application using MS Access. I realize I may make a fool of myself asking this question, but I'll just have to risk it. My database has several tables. The first table contains...
  7. cmlr

    Enclosure Latches UL508/CE

    Hi uwryguy, UL 508 does not require the enclosure to be opened with a special tool. In fact, the standard actually mentions latches to be a valid option, as long as they remain attached to the enclosure when the door is opened. I can't answer your question for CE. Caspar
  8. cmlr

    Screwing nameplates on NEMA 4X-rated enclosure

    Hi jraef, Thanks for your response. Since I have a copy of UL 508A I did a search, but could not find anything that said screws and other fasteners don't count for the NEMA rating (to be fair, I also didn't find anything saying they do...) Paragraph 52.4 of UL 508A specifies that markings...
  9. cmlr

    Screwing nameplates on NEMA 4X-rated enclosure

    Hi, Our client requires us to mount phenolic nameplates to some NEMA 4X rated enclosures using stainless steel screws. According to us any penetration with an unrated component (in this case the screws) violates the NEMA-rating of the enclosure. Does anybody know whether our reasoning is...

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