Mark C. Ode

Fire/Life Safety Columnist and Code Contributor

Mark C. Ode is a staff engineering associate at Underwriters Laboratories Inc., based in Peoria, Ariz. He can be reached at 919.949.2576 and

Articles by Mark C. Ode

March 2006
A new article has been proposed for the 2008 National Electrical Code (NEC) covering mission-critical electrical systems installed in vital infrastructures or facilities where, if the infrastructure or facility was either destroyed or incapacitated, disruption of the facility would affect national security, the economy, public health or the safety of our citizens. READ MORE
February 2006
Recent discussions on ground-fault circuit interrupter (GFCI) protection for personnel on construction sites have indicated that there seems to be a misunderstanding of whether generator power is excluded from the GFCI requirement. A thorough understanding of the history, origin and present requirements for GFCI protection may clear up any misunderstandings. READ MORE
January 2006
Within the past few years, many of us have installed surround sound systems in homes and business. What seems to be lacking is an understanding of the new requirements that have been incorporated into the totally revised Article 640 in the National Electrical Code (NEC). READ MORE
December 2005
The failure of a service-entrance bus duct supplying power to a major grocery store data center and corporate facility created a dilemma for store management. Since this facility is the 24-hour support system for all store transactions, maintaining power to the data center and the corporate complex is critical for continued business operation. READ MORE
November 2005
The May 2005 Code Applications column contained information on a major change in Article 680 for the 2005 National Electrical Code (NEC) concerning the construction requirements of fiberglass pools, vinyl-lined pools and concrete pools containing epoxy-coated rebar. READ MORE
October 2005
Providing mechanical protection for branch circuits supplying critical loads in a hospital is extremely important. Any potential damage to these circuits could cost lives. Patients rely on life support equipment and other electro-medical devices as part of their treatment, and any interruption of power could have dire results. READ MORE
September 2005
Many electrical contractors, electricians and electrical inspectors have struggled with the requirements in the National Electrical Code (NEC) for placement of lights, receptacles and switches in bathtub and shower areas. Can receptacles be installed within proximity of the bathtub or shower edge? READ MORE
August 2005
A new definition covering supplementary overcurrent-protective devices has been added to Article 100 in the 2005 National Electrical Code (NEC) to indicate that limited protection may be provided for specific applications or utilization equipment. READ MORE
July 2005
With the acceptance of the 2005 National Electrical Code (NEC), installing and servicing fluorescent luminaires (fixtures) has become a complex situation. The design and layout of the lighting system is critical in determining certain required added features. Part XIII of Article 410 provides special provisions for the connection of electric-discharge lighting systems of 1,000V or less. READ MORE