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

Articles by Mark C. Ode

August 2004
The five exceptions to providing nonflexible metal raceways Providing alternate power for essential electrical circuits in a hospital is extremely important during loss of normal power. Providing protection from damage will provide additional assurance of the continuity of power to circuits that are vital to the protection of life and safety in a hospital. READ MORE
July 2004
Brush up on what the NEC says about air conditioning During the hottest parts of the summer, most people do not notice the sound of air conditioning units turning on and off, but if a unit fails to start, the effect is noticed immediately. Comfort becomes a premium to be restored at all costs. READ MORE
June 2004
There’s money to be made, but hidden costs as well READ MORE
May 2004
The arc-fault circuit-interrupter (AFCI) has been around for three National Electrical Code (NEC) cycles and, with the advent of the new 2005 NEC, will have been present in three editions, although with various changes within each edition. However, there are still questions concerning how and where to apply these devices in the field. READ MORE
April 2004
Ground-fault sensing and relaying equipment is intended for use in power distribution systems rated at 600V maximum and are considered to be equipment protection devices, not personal protection devices. Ground-fault protection devices function at a predetermined value of ground fault in accordance with Section 230.95 of the National Electrical Code (NEC). READ MORE
February 2004
Many changes have occurred to the National Electrical Code (NEC) since the first NEC was published on Aug. 31, 1897. Even though the electrical industry was in its infancy, this “first” NEC was remarkably insightful and has withstood the test of time. Despite the many changes since the first NEC was established, some of the original requirements are still found in the 2002 NEC. READ MORE
January 2004
At one time or other, all contractors have been faced with a decision to either recalculate the size of an existing service or feeder or just guess at the amount of spare load and install new circuits while hoping for the best. Guessing will usually only get you in trouble. READ MORE
December 2003
This is the conclusion of a two-part article that began in the November issue. This part provides important information for listing and National Electrical Code requirements for installations of emergency, legally required standby and optional standby systems. READ MORE
November 2003
This is the first of two parts about installing emergency, legally required and/or optional standby systems. This first part will cover the basics of the three systems and the second part will cover requirements for transfer equipment. READ MORE