UEA is in the final stages of building our first hazardous location slip ring assemblies. The slip ring was designed to UL 1203 and in accordance to the NEC to operate in classified locations including Class II Div I & 2 group G, E, & F. Specifically, it was designed with the intention to be used in a grain bin application for a grain sweep offloading system or similar electrical rotary joint needs. In order to meet the hazardous location and demands of being covered with grain dust, which is potentially explosive when introduced to an ignition source, the enclosure required a complete redesign. The new enclosure is completely sealed except for the cable exits, shaft seal and a single threaded joint. By minimizing joints, the design has eliminated any dust contamination points of entrance. The enclosure is all aluminum which provides a rugged design while reducing cost in material, machine time, and any protective finish needed. All cable exits can also be additionally sealed using a sealing compound rated to UL 1203 standards if requested.
UEA wants to be able to fulfill a wide variety of customer needs and as such the hazardous slip ring assembly is highly customizable. It can account for a variety of circuit requirements up to 600 VAC rated and 100 Amps. Any cable length option the customer requires can be provided by our in-house harness shop. Also, any mounting requirements, standard is a mounting flange, can be accommodated with our in house machine shop. The design even has large enough fittings to accept up to a 2-11-1/2 NPT fitting and is designed so that multiple cable exit locations can be made available.
The prototype was designed with safety, customization, and cost in mind. If you are in need of a hazardous location slip ring for your grain bin design, or any other hazardous location application, please let us know. For more information about UEA slip rings, visit http://www.uea-inc.com/products/slip-rings/.
R & D Engineer