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NEC ratings for a simple device?

Discussion in 'Electronic Basics' started by thomas, Apr 24, 2007.

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  1. thomas

    thomas Guest

    A customer wants to use one of our thermocouples in a Class II Div 1
    environment (i.e. it must be dust-ignition proof).

    From what I can tell by reading NEC Articles 500 and 502 (several times!) a
    thermocouple is a "simple apparatus" and therefore does not need to be
    marked with its evalutated Class, Division, etc. per 500.8 B(6)(d) "Special
    Allowances for Simple Apparatus".

    Our thermocouple assembly consists of a stainless sheath, potting compound,
    thermocouple wire, bolted to a NEMA 3R Aluminum junction box. Being a
    "simple apparatus" it looks like we won't need a more expensive Class II Div
    1 rated junction box. And, it appears that UL Listing is not needed.

    Does this sound correct so far?

    If so, can we just label it with: "Rating: Class II, Division 1, Groups E,
    F, G"?
    Can we use the word approved: "Rating: Approved for Class II, Division 1,
    Groups E, F, G" ?
  2. Charles

    Charles Guest

    Don't really know, but I'd guess it is a low-voltage device and will not
    require the Class II box or UL listing.
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