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

Articles by Mark C. Ode

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
February 2012
In the past few cycles of the National Electrical Code (NEC), there have been numerous and substantial changes involving dwelling-unit receptacles and lighting outlets in 210.52 with general layout requirements in Part III enhanced by these text changes. READ MORE
January 2012
In the past few editions of the National Electrical Code (NEC), light-emitting diode (LED) illumination systems have been inserted into almost every article where lighting is mentioned. Continuing that trend in the 2011 NEC, Article 410 (luminaires) and Article 600 (electric signs and outline lighting) have been updated with additions concerning LEDs. READ MORE
December 2011
Hurricane season is over, and the inundation of floodwaters in many parts of the country has likely receded by now. However, evaluating electrical equipment that has been subjected to water and determining whether to recondition the equipment or replace it remains a serious issue. READ MORE
November 2011
Arc-fault circuit interrupter (AFCI) protection was originally proposed for the 1996 National Electrical Code (NEC) by the Electronic Industry Association, but it failed to receive enough votes during the adoption process. The electronic and electrical industry spent time and money and used extremely qualified technical experts to develop and test AFCI circuit breakers. READ MORE