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 Mark.C.Ode@ul.com.

Articles by Mark C. Ode

November 2015
The National Electrical Code (NEC) uses the word “harmonic” exactly 11 times, all in combination with or explanation of neutral conductors. However, “harmonic” is not defined in the NEC. READ MORE
October 2015
National Electrical Code (NEC) 110.26(C)(3) requirements, which cover means of egress from electrical equipment rooms, used to be straightforward. However, two major changes to this section in the 2014 NEC involve panic hardware and the ampere (A) threshold level of the electrical equipment in equipment rooms, and they are a bit complicated.
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September 2015
For my December 2005 column in ELECTRICAL CONTRACTOR, I wrote about the installation of parallel conductors in a metal wireway and the subsequent heating effects. These heating effects occur whether the parallel conductors are installed in a metal or nonmetallic wireway or in an auxiliary gutter. READ MORE
August 2015
New text in section 424.66(A) of the 2014 National Electrical Code (NEC) covers working space for electrical enclosures of resistance heating-element-type duct heaters mounted on air-duct systems in limited-access areas. New subsection 424.66(B), Limited Access, addresses examination, adjustment, servicing or maintenance while energized. READ MORE
July 2015
Safety for solar photovoltaic (PV) systems has come a long way since the first installation requirements were inserted as Article 690 into the 1984 National Electrical Code (NEC). Between the 1984 NEC and the 2014 edition, there have been hundreds of proposals and comments to change the requirements in Article 690, and many of these suggested changes have been implemented into the NEC. READ MORE
June 2015
During the recent 2017 National Electrical Code (NEC) first revision meetings in Hilton Head, S.C., a number of public inputs were submitted to introduce a new cabling system into Article 725 and Article 760. Article 725 covers Class 1, 2 and 3 remote control, signaling and power-limited circuits, and Article 760 covers nonpower-limited and power-limited fire alarm circuits. READ MORE
May 2015
My daughter, Trina Bogart, is an emergency department doctor. She recently emailed me a seemingly simple question. However, when I went to the 2014 National Electrical Code (NEC), I realized it was actually more complicated. The question involved combination toilet and sink units installed in a hospital’s emergency department cubicles, which have receptacles close to the basin. READ MORE
April 2015
The DC Task Group of the NEC Correlating Committee is proposing three new articles for the 2017 edition of the National Electrical Code (NEC). The first is Article 706, covering energy-storage systems (ESS). The second is Article 710, covering microgrids. The third is Article 712, covering direct current (DC) microgrids. READ MORE
March 2015
Are multiwire branch circuits becoming antiquated for most new installations, or are they still being used in most circuit applications? READ MORE

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