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Thread: Designing control panel and equipment for CLI, DV2 location

  1. #1
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    Designing control panel and equipment for CLI, DV2 location

    Hello. I've returned to a field that requires some hazardous location design. I struggle trying to use the NEC book to understand anything at times. Basically- we have a skid that is determined to be in a CLI,DV2 environment. A remote I/O panel will be located on the skid. The intent was to have a Nema 4X box with all internal components listed for CLI,DV2 (Basically PLC I/O modules). On the skid there will be a mix of pressure/temp xmtrs and solenoid valves (most likely CLI,DV1 rated).

    My questions would be:
    Is the Nema 4x panel with all CLI,DV2 components acceptable to be on the skid? Can i have a supply fuse?
    What rating do the devices need to be on skid? I understand CLI,DV1 would be acceptable but not needed for DV2. Would I try to use Non Incendive devices or design? If so- how do I find out exactly what is required? Are barriers required for NI or just IS? Typically we use RTD's with a transmitter in the head (PR 5333D).
    Where can I go for training to learn the correct methods of hazardous location design?

    Any help would be appreciated. Thanks.


    Dave

  2. #2
    Join Date
    Aug 2004
    Location
    Northern illinois
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    Quote Originally Posted by dgalenski@glauber.com View Post
    Hello. I've returned to a field that requires some hazardous location design. I struggle trying to use the NEC book to understand anything at times. Basically- we have a skid that is determined to be in a CLI,DV2 environment. A remote I/O panel will be located on the skid. The intent was to have a Nema 4X box with all internal components listed for CLI,DV2 (Basically PLC I/O modules). On the skid there will be a mix of pressure/temp xmtrs and solenoid valves (most likely CLI,DV1 rated).

    My questions would be:
    Is the Nema 4x panel with all CLI,DV2 components acceptable to be on the skid? Can i have a supply fuse?
    What rating do the devices need to be on skid? I understand CLI,DV1 would be acceptable but not needed for DV2. Would I try to use Non Incendive devices or design? If so- how do I find out exactly what is required? Are barriers required for NI or just IS? Typically we use RTD's with a transmitter in the head (PR 5333D).
    Where can I go for training to learn the correct methods of hazardous location design?

    Any help would be appreciated. Thanks.


    Dave
    If it is a C1D2 area, why would you need C1D1 field devices? It is not a code violation but not usually necessary.

    NI is a design technique and does not require anything extra to meet C1D2 requirements.

    Maybe you should see if you can find someone who has some expertise in this area to guide you. I find it uncomfortable when people are trying to design this kind of thing by a committee of semi-anonymous Internet posters. There is nothing wrong with questions but the problem is that until you know most of the answers you probably won't know what questions to even ask. That is one reason why the forum does not answer DIY questions.
    Bob

  3. #3
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    Quote Originally Posted by petersonra View Post
    If it is a C1D2 area, why would you need C1D1 field devices? It is not a code violation but not usually necessary.
    We typically standardize on the valves for both DV1 & DV2 so we can use on either.


    Quote Originally Posted by petersonra View Post
    Maybe you should see if you can find someone who has some expertise in this area to guide you. I find it uncomfortable when people are trying to design this kind of thing by a committee of semi-anonymous Internet posters. There is nothing wrong with questions but the problem is that until you know most of the answers you probably won't know what questions to even ask. That is one reason why the forum does not answer DIY questions.
    I do not intend to design by committee rather get some feedback on this type of system. This would enable both more intelligent questions and an understanding of what to research in the NEC code book.

  4. #4
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    Location
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    Quote Originally Posted by dgalenski@glauber.com View Post
    We typically standardize on the valves for both DV1 & DV2 so we can use on either.



    I do not intend to design by committee rather get some feedback on this type of system. This would enable both more intelligent questions and an understanding of what to research in the NEC code book.
    While the NEC is involved, it is really not something you can "research in the NEC code book". the code is an installation standard, and not something that tells you how to design anything.
    Bob

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