Mark C. Ode

Fire/Life Safety Columnist and Code Contributor

Mark C. Ode is a lead engineering associate for Energy & Power Technologies at Underwriters Laboratories Inc. and can be reached at 919.949.2576 and Mark.C.Ode@ul.com.

Articles by Mark C. Ode

April 2013
Article 424 in the National Electrical Code (NEC) addresses fixed electric space heating equipment, stating, “for the purpose of the article, heating equipment shall include heating cable, unit heaters, boilers, central systems, or other approved fixed electric space-heating equipment.” Since the scope clearly covers boilers, further investigation into Article 424 will determine if the NEC covers READ MORE
March 2013
Over the years, there always seemed to be a lack of understanding of the requirements for feeder taps as well as transformer primary and secondary overcurrent protection. READ MORE
February 2013
In the 2005 National Electrical Code (NEC) process, proposals were submitted to change the phrase “equipment grounding conductor” to “equipment bonding conductor” wherever the phrase existed throughout the NEC. READ MORE
January 2013
In the March 2012 Electrical Contractor, I mentioned the increased number of receptacles in patient bed locations with a minimum of 14 receptacles in a Category 1 critical-care area and 36 receptacles in a Category 1 operating room for the 2014 National Electrical Code (NEC), based on changes in the 2012 NFPA 99, the Standard for Health Care Facilities. READ MORE
December 2012
There are many reasons for motor failures, such as overloading, bearing failures, rotor failures, worn shafts, and short circuits or ground faults within the motor windings, and contaminants that may enter the motor, causing short circuits or overloading. These failures occur for both single- and three-phase motors. READ MORE
October 2012
From marking equipment and conductors at the factory to field-marking with signs where electrical hazards exist, there are hundreds, if not thousands, of marking requirements in the National Electrical Code (NEC). READ MORE
August 2012
A question was raised at a recent meeting that I attended. It started a search through both current and older versions of the National Electrical Code (NEC). READ MORE
July 2012
In the 2005 National Electrical Code (NEC), 310.10, fine print note No. READ MORE
May 2012
I started this series of articles after a friend asked some questions about overcurrent protection for the direct current (DC) output of photovoltaic (PV) modules, the DC output of combiner boxes, the location of disconnects for both the DC side and the alternating current (AC) side of the inverter, and the sizing of conductors on both sides. READ MORE

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