Recently, I received a call from an electrician friend who wanted to know how to determine the difference between a raceway, nipple and sleeve, and this individual has been an electrician for 20-plus years. I explained the procedure that I felt was used per the National Electrical Code (NEC) to determine when a raceway, nipple or sleeve is used as a wiring method in an electrical system. READ MORE
James G. Stallcup
Code Contributor
James G. Stallcup is the CEO of Grayboy Inc., which develops and authors publications for the electrical industry and specializes in classroom training on the NEC and OSHA, as well as other standards. Contact him at 817.581.2206.
Articles by James G. Stallcup
August 2007
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The overcurrent protection (OCP) for Class 2 and 3 circuits is inherent because it is equipped in their power supply. Separate OCP when used for these circuits only applies to the supply side of the power source. Section 725.51 requires such protection when installed on the supply side to be limited to 20 amps or less. READ MORE
July 2007
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Class 2 and 3 circuits are defined as the portion of the wiring system between the power source and the connected equipment. Because of the power limitations of Class 2 circuits, many consider them to be safe from a fire initiation standpoint and to provide an acceptable level of protection from electrical shock. READ MORE
June 2007
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According to the National Electrical Code, Part 2 In 725.23, The National Electrical Code (NEC) covers overcurrent protection (OCP) for Class 1 circuits. Plainly stated, this section allows the ampacity of the conductors to be used, and by complying with 725.28 and 310.15, whichever is appropriate, the derating factors can be disregarded. READ MORE
April 2007
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How to determine requirements—part 2: To be on the safe side, the working space and space around electrical equipment should always be clear per 110.26(A), if possible. As a basic rule, there should be at least 3 feet of space in front of all equipment with a 30 inch width as well as 6½ feet of headroom space. READ MORE
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I recently did a workshop for a major city experiencing problems with inspections on photovoltaic (PV) systems during and after installation. The problem was between the inspection and fire department. READ MORE