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

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
June 2005
Selective coordination has been a requirement in the National Electrical Code (NEC) for many years but has been limited to a few required applications. READ MORE
May 2005
A major change has occurred in Article 680 in the 2005 National Electrical Code (NEC) that will affect all swimming pools not constructed using conventional steel rebar and concrete (gunite). This change will dramatically affect the construction of fiberglass pools, pools using plastic liners and those using epoxy-coated steel rebar. READ MORE
April 2005
The text in Section 230.40 covering the number of sets of service-entrance conductors for each service drop or lateral has not changed since it was accepted into the 1984 National Electrical Code (NEC). READ MORE
March 2005
Arc-fault circuit-interrupter(AFCI) protection requirements were first submitted to the National Electrical Code (NEC) process for the 1996 NEC but were not accepted until the 1999 NEC. These requirements as detailed in Section 210.12 were expanded for the 2002 NEC and have been changed again for the 2005 NEC. READ MORE
February 2005
In the 2002 and previous editions of the National Electrical Code, the metal frame of a building or structure was required to be used as a grounding electrode when the metal of the building or structure was effectively grounded. Whether the metal frame of the building or structure was considered effectively grounded became a judgment call of the installer, the inspector or both. READ MORE
January 2005
Ground-fault circuit interrupter (GFCI) protection for personnel or a similar protection technique has been in the National Electrical Code (NEC) since 1962 with specific reference to GFCI and its definition found in the 1968 NEC. Each subsequent edition of the NEC has seen expansion of the requirements for this very important safety device. READ MORE
December 2004
Grounding electrodes are required to be installed and connected to electrical services and to some feeders or branch circuits in separate buildings remotely located from the service. Is the grounding electrode conductor permitted to be installed inside the building, and if so, what is the permissible length of the grounding electrode when located inside the building? READ MORE
November 2004
Most electricians are very familiar with the spacing requirements for receptacles in dwelling units. In kitchens, family rooms, dining rooms, living rooms, parlors, libraries, dens, sunrooms, bedrooms, recreation rooms or similar rooms, receptacles must be installed so that no point along the floor line is more than six feet measured horizontally from a receptacle outlet in any wall space. READ MORE