According to a recent article in FIRE ENGINEERING magazine, fire-rated doors and walls are considered passive fire protection and often get little publicity. When fire-rated doors do receive publicity, it is often because of a failure resulting from poor maintenance or from having been blocked open before the fire. Fortunately, these incidents are rare due to conscientious building and fire inspectors and the building owners and managers who maintain them as required by the building and fire codes, and by National Fire Protection Association (NFPA) Standard 80, Fire Doors and Other Opening Protectives.
Proper grounding and bonding prevent unwanted voltage on non-current-carrying metal objects, such as tool and appliance casings, raceways, and enclosures, as well as facilitate the correct operation of overcurrent devices. But beware of wiring everything to a ground rod and considering the job well done. There are certain subtleties you must follow to adhere to applicable NEC rules and provide safe installations to the public and working personnel. Although the ground theory is a vast subject, on which whole volumes have been written, David Herres, in his article in EC& M magazine, asks us to take a look at some of the 10 most common grounding errors you may run into on a daily basis. The first is: