Print Page   |   Contact Us   |   Sign In   |   Join
IAEI Magazine | Author: Howard Herndon
Share |

Howard Herndon

Howard Herndon is principal of SouthWest Electritech Services, an independent electrical technical and testing services company based in Las Vegas, Nevada. Howard has over thirty years of experience in various fields in the electrical industry including electrical distribution equipment manufacturers, electrical systems designs, short circuit and coordination studies, electrical equipment field testing, and teaching electrically-based classes including electrical safety and code classes. Howard has served on the Board of Directors of the International Association of Electrical Inspectors, Southern Nevada Chapter since 2001, currently holding the position as secretary and treasurer of the chapter since 2005. He also serves on the Southern Nevada Electrical Code Committee as an industry member since 2005 for both the 2005 and 2008 NEC Southern Nevada Amendments.


Rooftop Wiring Temperature — Field Installation Experiment

The rooftop temperature adders in NEC 310.15(B)(3)(c) were first included in the 2008 NEC. The proposal to include this requirement was based on a study that showed increased temperatures in conduits on rooftops in direct sunlight. However, there remained unanswered questions for the Southern Nevada Chapter of IAEI; they live with extreme temperatures, and yet installers and inspectors have not seen evidence of failure related to rooftop installations. Since the impact on conductor sizing due to this requirement is significant in the Southern Nevada area, the Chapter funded an experiment to gather more information about rooftop electrical installations exposed to direct sunlight.

Ground-Fault Protection Systems and Electrical Inspections

Ground-fault protection of electrical equipment is required by the National Electrical Code (NEC) in order to minimize the damage to the equipment in the case of a ground fault. Ground-fault protection of equipment is "a system intended to provide protection of equipment from damaging line-to-ground fault currents by operating to cause a disconnecting means to open all ungrounded conductors of the faulted circuit.