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Hazardous areas, UL standards.

Hazardous areas, UL standards.

Hazardous areas, UL standards.

(OP)
I am hoping my American counterparts over the pond can help me out with an issue relating a UL certified motor for use in a hazardous area we presently have in the shop for repair.
Its a double-shafted vibrator motor made by a company called Electra-motors who are/were based in Arnaheim California. There is no date on the the nameplate but my guess is it could be about 40yrs old. the nameplate states its class 1 group D and class 2 group F and G, it also gives what I assume is a UL test certificate S/G650556. We have been asked to certify that this motor is still servicable and safe for use in a hazardous area. Normally when we do this with a motor there are two options open to us, by comparing flamepath dimensions with the manufactures drawing or by the relevent flamepath dimensions quoted in the construction standard the motor was manufactured to and tested under.
Its realtively easy with modern Euro` spec kit. I have copies of all our standards going back to BS229 but 40 yr old American kit is proving something of a challenge.
After a bit of digging on the UL site and by cross referencing the certificate number I have found what I assume is the UL standard under which this motor was constructed and tested under. This standard being UL674. My question is can anyone confirm if this is the correct standard, and if I am wrong what is the correct standard. I intend to get my MD to try and get a copy of the correct standard via his EASA contacts.
I would welcome and appreciate any comments or information on this subject.

RE: Hazardous areas, UL standards.

I took at quick look and it appears to be the correct standard. It says UL647 was first issued in Aug 1978 but it combined UL647A and B into one document where A was for class I div I and B was for class II div I.

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