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 mark.c.ode@us.ul.com.

Articles by Mark C. Ode

March 2009
Many are aware that electrical equipment arcing and sparking -can cause chemical atmospheres (gases, vapors and dusts) to ignite. However, we often forget that thermal ignition of these chemical atmospheres also can occur if the chemicals are exposed to high temperatures. READ MORE
February 2009
A requirement for short-circuit current rating was added in the 2005 National Electrical Code (NEC) to Section 430.8 covering motor controller marking, to Section 440.4(B) covering controller marking for air conditioning and refrigerating equipment, and to 409.110 covering controller marking for industrial control panels. READ MORE
November 2008
Emergency circuits are installed in patient bed locations in general care and critical care areas in hospitals to ensure power is available to electrical equipment even where normal power is lost for some reason. READ MORE
October 2008
Many installations have exposed raceways and electrical equipment of all kinds on rooftops, walls and other direct sunlight applications, since this has been a common installation method for many years. READ MORE
September 2008
Certain changes to the National electrical Code (NEC) take more than a single cycle to accomplish due to the complexity of the issues, changes that may involve more than one NFPA committee, changes that involve more than one NEC panel, changes where another NFPA committee and an NEC panel are involved, or the enormous affect the changes may have on the electrical industry. READ MORE
August 2008
Article 338 of the National Electrical Code (NEC) covers the use, installation and construction specifications of service-entrance (SE) cable. Electricians commonly use these cables for service conductors and for feeders and branch circuits in residential and small commercial installations. READ MORE
July 2008
A seemingly simple change in the 2008 National Electrical Code (NEC)— prompting revisions or deletions of text for municipal, county or state NEC adoption processes relating to the installation of exposed nonmetallic-sheathed (NM) cable in a dwelling unit crawl space—has upset some people in the electrical industry. READ MORE
June 2008
Tamper-resistant receptacles will significantly reduce the number of injuries that result when someone inserts a foreign object into receptacles within a residential occupancy. READ MORE
May 2008
Arc-Fault Circuit Interrupter (AFCI) protection has been a requirement since the 1999 National Electrical Code (NEC), starting as protection for receptacles in bedrooms and then progressing to protection of all outlets in bedrooms with changes in later Code cycles. READ MORE

Pages