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

May 2010
Recently, a question was raised about where the means of egress from a working space started and stopped based on changes that occurred in 110.26(C)(3) for 600-volt (V) or less installations and in 110.33(A)(3) for more than 600V installations in the 2008 National Electrical Code (NEC). READ MORE
April 2010
An increasing number of occupancy sensor switches, involving infrared sensing, are being installed in commercial, residential and industrial installations to cut power usage and comply with energy conservation codes. READ MORE
February 2010
A recent addition to the 2008 National Electrical Code (NEC) has prompted a possible change for the 2011 NEC and a number of questions from electricians, electrical contractors, electrical inspectors and electrical engineers. READ MORE
January 2010
Recently on a cross-country flight, I noticed the incredible number of alternative power sources that are in the process of being installed or have already been installed and are in operation. From the air, it was easy to recognize why the wind generators are placed in long lines along cliffs and in areas where natural air movement power the generators. READ MORE
November 2009
Based on a new requirement in Section 210.8(B)(5) of the 2008 National Electrical Code (NEC), all 125-volt, single-phase, 15- and 20-ampere receptacles installed within 6 feet or 1.8 meters of the outside edge of a sink in a commercial or industrial facility must be covered by ground-fault circuit interrupter (GFCI) protection for personnel. READ MORE
October 2009
The 20th and 21st centuries have seen many changes in gasoline stations. READ MORE
September 2009
The purpose of ground-fault protection on temporary wiring installations during construction, remodeling, maintenance, repair or demolition of buildings, structures or equipment is to ensure personnel protection. Section 590.6 re-quires ground-fault circuit interrupter (GFCI) protection for any temporary power source supplying electrical equipment on the job site. READ MORE
August 2009
In section 250.52(A)(2) of the 2005 and the 2008 editions of the National Electrical Code (NEC), the metal frame of a building or structure is considered to be a grounding electrode if the metal frame is connected to earth by one of four different methods. Upon analyzing the four different methods, many electricians’ question whether the four methods provide an appropriate connection to earth. READ MORE
July 2009
Recently, I fielded a question about the basic statement in Section 695.3 of the 2008 National Electrical Code (NEC) that “electric motor-driven fire pumps shall have a reliable source of power.” The question involved the reliability of the power source for one of the most important electrical motors in a building. READ MORE