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

February 2017
For many years, the mystery of area classification has resided with a select group of experts within the electrical, petrochemical and industrial sectors. Many electricians, electrical engineers, fire inspectors and electrical inspectors have remained outside of this group. READ MORE
January 2017
In the past few months, I have received emails and phone calls from electrical inspectors and contractors stating there is confusion in their areas concerning swimming pool equipotential bonding. They requested that I clarify the bonding requirements for swimming pools. READ MORE
December 2016
The National Electrical Code (NEC) has contained multiwire branch-­circuit color coding since the early 1950s. However, it wasn’t until the 2005 NEC that it required the voltage system to identify ungrounded conductors where a building had more than one voltage system. Each system is identified by separate insulation color coding, marking tape, tagging or other approved means. READ MORE
November 2016
Electrical overcurrent protective system Coordination can be complex and daunting. It is best approached with knowledge of the basics and proper system design. READ MORE
October 2016
Ambient temperature correction adjustments relating to conduits exposed to sunlight on rooftops were inserted into the 2008 National Electrical Code (NEC) as new subsection 310.15(B)(2)(c) with accompanying Table 310.15(B)(2)(c). The subsection’s purpose was to provide a temperature adder for any conduit installed on a building’s rooftop.
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September 2016
The 2017 National Electrical Code (NEC) will feature the new Article 691, which covers nonutility company, large-scale photovoltaic (PV) electric supply stations with generating capacities of at least 5,000 kilowatts (kW). READ MORE
August 2016
Historically, the National Electrical Code (NEC) has required much of the electrical equipment, wiring methods and other electrical parts used in the electrical industry to be listed. The key behind listing requirements is located in Section 110.3(A), which states, in judging equipment, considerations shall be evaluated for suitability for installations and use in conformity with NEC provisions. READ MORE
July 2016
In March, I attended a Central Arizona Chapter International Association of Electrical Inspectors (IAEI) meeting. A discussion ensued about the growing number of improperly installed and uncertified light-emitting diode (LED) retrofit lighting kits. In fact, Underwriters Laboratories (UL) just issued a public notice to warn of these dangers. The notice can be found in the newsroom at www.ul.com.
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June 2016
A caller recently asked if all 125-volt (V), 15- and 20-ampere (A) receptacles in a commercial kitchen were required to be ground-fault circuit interrupter (GFCI) protected, even where part of a listed assembly. I answered with an absolute yes; I said there are no exceptions that permit unprotected receptacles. READ MORE

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