Class 1 div 2 seal off requirements

I am installing fractional horsepower three phase exhaust and make-up fans for a class div rated room. There is no requirement for a seal on the NEMA box that contains splices where the enclosure is in a Class!, Division area. 20Code Digest - Cooper Industries A source of energy is all that is needed to touch off an explosion when. 20Code Digest EATONS CROUSE -HINDS BUSINESS.

If the ignitable material is normally present (in sufficient quantities to present a hazard). In the May issue, we described the Division system outlined in the NEC, which further breaks down the class. The recognized acceptable wiring methods are included in 50 with (A) addressing Division locations, and (B) addressing Division locations. Advise ignition temperature of the potential hazard or T code and class with requests.

Enclosure seals in those areas are only required if the enclosure is required to be of explosion proof construction. NFPA requirements and restrictions must be observed.

Fan is a complete unit with class div rated motor. These motors meets, during normal operation, The Definition in the National Electric Code (b) for motors permitted to be installed in Class Division II areas. Conduit and cable sealing requirements for Class II locations are provided in Article 5and are not covered in this article.

There is differing opinions on the question of the transmitter seal. Which I believe means it has a factory, explosion proof seal off at the pot head. Article 5Class I Locations 50COMMENTARY TABLE 50 Conduit and Cable Sealing Requirements Classification Application Location of Seal Conduit Seals Class I, Division Switch enclosure Circuit breaker enclosure Fuse enclosure Relay enclosure Resistor enclosure Arcing or sparking apparatus High-temperature apparatus Explosionproof. Wiring requirements within Class I hazardous areas using Division system are found in Part II of Article 501. These fans are roof mounted outside the hazardous area boundary.

National Electric Code: Article 5Class I Locations 505. Here are three Exceptions to rule 505(B 2) to take note of: Exception 1: A raceway boundary seal fitting isn t required for a raceway that passes through the Class I, Division area unbroken with no fittings less than ft beyond the boundary to an unclassified location. This article reviews important sealing requirements for wiring in hazardous locations, specifically locations that are designated Class I, Division and 2. Whether an area is Division or 2. Wiring requirements for the Class I, Zone system are found in 505. Article 5provides the requirements for Class I locations, such as the refinery shown in Photo 1. Seals are not required in Class III locations.

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