what do these marking mean?

Discussion in 'General Electronics Chat' started by ees1, Dec 23, 2009.

  1. ees1

    Thread Starter Active Member

    Jan 7, 2008
    37
    0
    I have a product. its label has two triangles marks on it. one inside has a word "F", another one inside has a word "M".
    What do they mean?
    thanks.
     
  2. VoodooMojo

    Active Member

    Nov 28, 2009
    503
    53
    along these lines?


    FM: Factory Mutual Research Corporation
    [​IMG]The Factory Mutual Approvals Division determines the safety and reliability of equipment, materials, or services utilized in hazardous locations in the United States and elsewhere. Factory Mutual certifies to NEC (National Electrical Code) standards for hazardous locations, NEC Standard 500 (Division classification) and also to the new NEC Standard 505 (Zone classification), which attempts to harmonize American and European classifications. For a product to receive approval, it must meet two criteria. First, it must perform satisfactorily, reliably, and repeatedly as applicable for a reasonable life expectancy. Second, it must be produced under high quality control conditions. Factory Mutual also has interlaboratory agreements and can certify to Canadian and European standards.
     
  3. ees1

    Thread Starter Active Member

    Jan 7, 2008
    37
    0
    the f mark is triangle shape. same as M mark.
     
  4. ees1

    Thread Starter Active Member

    Jan 7, 2008
    37
    0
    the F mark is individual symbol, same as M mark.
     
  5. hgmjr

    Moderator

    Jan 28, 2005
    9,030
    214
    Can you take a digital picture of it or sketch it and scan it to a digital file so that we can better understand the symbol?

    hgmjr
     
  6. VoodooMojo

    Active Member

    Nov 28, 2009
    503
    53
    can you provide a photo?
    someone here will recognize it.
     
  7. ees1

    Thread Starter Active Member

    Jan 7, 2008
    37
    0
    see the picture.
     
  8. BMorse

    Senior Member

    Sep 26, 2009
    2,675
    234
    what is the product that these symbols are on??
     
  9. VoodooMojo

    Active Member

    Nov 28, 2009
    503
    53
    it appears to be an IEE Wiring Regulations BS7671 label:
    F:
    is suitable for installation on surfaces with normal flammability, e.g. wood, plasterboard, masonry. It is not suitable for use on highly flammable surfaces, e.g. polystyrene, textiles, etc.

    M:
    refers to moisture suitability?

    check and download this regulation at
    www.communities.gov.uk
    follow the link for Building Regulations

    some kind of light fixture?
     
    Last edited: Dec 23, 2009
  10. ees1

    Thread Starter Active Member

    Jan 7, 2008
    37
    0
    i am surprised by the speed of your research result, and I am very curious to know what the key words you put in the search engine and which search engine you were using.
    obviously you are a smart person. thank you.
    your explaination makes sense, but the link you quote doesn't have the description you made, and wonder how you got the explanation.
     
  11. ees1

    Thread Starter Active Member

    Jan 7, 2008
    37
    0
    and I couldn't find any building regulation containing the info you provide. still a puzzle :confused: to me.
    Can you please provide a actual link?
     
  12. ees1

    Thread Starter Active Member

    Jan 7, 2008
    37
    0
    a simply question, u guys make so complicated.
     
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