Up Time Magazine- February/March 2008

adhesive. If there is adhesive, it should be faced outwards during taping; 2. Rubber insulating tape; and, 3. Vinyl electrical tape. The first step is to apply two layers of varnished cambric tape. This provides a barrier to sharp edges of the connection in addition to electrical insulation. The next layer should be four half-lap layers of rubber tape. During application a constant tension should be applied so that the rubber tape bonds to itself, which is a moisture barrier. On top of the rubber, tape two half-lap layers of vinyl electrical tape should be applied and should extend at least 1 inch below the rubber tape along the feeder conductor(s) and motor lead(s). The tape should also have tension applied as it is wrapped so that it conforms to the layers underneath and has a good seal against moisture and contaminants while also providing an armor jacket to the other layers. Services and a member of the National Writers Union (UAW Local 1981). SBD provides training and facilitation for the application of motor management programs for clients that include General Motors and US Steel. For more information, contact SUCCESS by DESIGN at 800 392-9025 ext 203 (USA Only) or 860 577-8537 ext 203, via email at info@ motordoc.net or our website http://www. motordoc.net. Performance Evaluation has been testing electrical equipment for the past 22 years with an assortment of test equipment. Performance has used both static and dynamic tests to help prevent unscheduled downtime. The testing includes AC/ DC motors of all sizes and transformers. Performance contact is Richard Borge, www.performancetdr.com, 888-484-7564, perfeval@aol.com and 973661-4281 (fax). Conclusion Proper insulation of motor lead connections is important to ensure reliable and safe operation of an electric motor. Unfortunately, the tendency has been to move away from the proper application of both splicing and the insulation system, which has led to shorts to ground within connection boxes. The NFPA 70-2007 (NEC) and NFPA 79-2007 address a number of issues related to splicing and insulating connections including disallowing the use of twist-on connectors. The optimal method for time savings and proper insulation includes the use of lugs or split bolts, proper torque, and commercially available splicing kits. Alternately, taping of the connections can be performed with a proper taping procedure that includes insulated cambric, rubber, and vinyl tapes. Bibliography NFPA, NFPA 70-2007 National Electrical Code, Article 430, 2007 NFPA, NFPA 79-2007 Electrical Standard for Industrial Machinery, 2007 Goodman and Brown, “Electrical Taping Skills: A Lost Art?” EC&M Magazine, January 1, 2006. Penrose and Borge, “The Right Connections,” Uptime Magazine, December/January 2008. Howard W Penrose, Ph.D., CMRP is the President of SUCCESS by DESIGN Reliability www.uptimemagazine.com 61 http://www.performancetdr.com http://www.motordoc.net http://www.motordoc.net http://www.mikroninfrared.com http://www.mikroninfrared.com http://www.uptimemagazine.com

Table of Contents Feed for the Digital Edition of Up Time Magazine- February/March 2008

Up Time Magazine- February/March 2008 Contents Upfront Upclose: Lessons Learned from the Walter Reed Story Information Technology: Parenting and Asset Performance Infrared: It's Alive! Lubrication: A Sense of Change Maintenance Management: PdM, Standardized Motor Testing: Being Well Connected Precision Maintenance: How to be Marketable Reliability: The Voyage of Wells Dairy Ultrasound: Two is Better Than One Vibration: Diagnosing a Cracked Shaft Upgrade: A Different Kind of Journey

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