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

February 2011
As I discussed in last month’s column, Article 310, covering conductors for general wiring, has been totally rewritten for the 2011 National Electrical Code (NEC). This article is now divided into three parts: Part I covers general requirements, Part II covers installations of conductors, and Part III covers construction specifications for conductors. READ MORE
November 2010
The 2011 National Electrical Code (NEC) provides a controversial and much-discussed new 110.24 involving field-marking of available fault current on service equipment. The new requirement will not be required for dwelling units, and an exception has been added to the new text that permits a major portion of the electrical industry to bypass it. READ MORE
September 2010
Where raceways and cables contain No. 4 AWG or larger conductors and connect to conduit bodies, do these conduit bodies have to meet the same dimension requirements as pull and junction boxes? Does the 2008 National Electrical Code (NEC) provide clear and concise text covering this situation, or is an interpretation of the text necessary? READ MORE
August 2010
My August 2007 article, “Isolated Ground Receptacles,” questions whether isolated ground (IG) receptacles should be permitted in a patient care area. I wrote that Article 517 of the National Electrical Code (NEC) applies to electrical construction and installation criteria in healthcare facilities, providing healthcare services to human beings. READ MORE
July 2010
Electrical construction has always been a dangerous profession, so finding ways to make the work less hazardous is certainly the goal of the National Electrical Code (NEC); Underwriters Laboratories; the Occupational Safety and Health Administration; NFPA 70E, the Standard for Electrical Safety in the Workplace; the National Electrical Manufacturers Association; the National Electrical Contractors READ MORE
June 2010
Recently, i witnessed an electrical inspector and a group of electricians discussing the effectiveness of the bonding and grounding path where raceway fittings are used to connect raceways to threaded hubs, threaded bosses or conduit bodies. Although this is a fairly common practice in the field, the discussion revealed varied opinions on the acceptability of these installations. READ MORE
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

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