Where to start?
The motor as described simply isn’t recognized for use in any location classified as Class I, Division 1 under Articles 500 and 501. It may be possibly be suitable for a “Zone” classified location (Article 505) with appropriate Nationally Recognized Testing Laboratory (NRTL) certification with an “AEx” marking. See Sections 505.9(A)(1) and (C)(2). Of course the location must actually be classified under Zones. Remember, the classification schemes, Division and Zone, are not permitted to be used in the same location. See Section 505.7(B).
Under Section 505.9(A)(3) the motor in a “Zone” location may be found suitable if the Authority Having Jurisdiction believes there is acceptable evidence such as a manufacturer's self-evaluation or an owner's engineering judgment. I wouldn’t count on it.
It is unlikely that a NRTL would certify the motor for Division use since the test standards for Divisions and Zones are sufficiently different.
Last edited by rbalex; 09-12-08 at 05:58 PM.
Robert B. Alexander, P.E.
"I know that you believe you understand what you think the NEC says, but I am not sure you realize that what you read is not what it means." (Corollary to Charlie's Rule)