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Illustrated Changes to the NEC, 2002 Edition - Part 2

Article 500

Hazardous (Classified) Locations

500.2 Definitions

A new definition for Electrical and Electronic Equipment was added and it reads:

Electrical and Electronic Equipment. Materials, fittings, devices, appliances, and the like that are part of, or in connection with an electrical installation.

FPN: Portable or transportable equipment having self-contained power supplies, such as battery-operated equipment such as cordless drills, cell phones, computers, could potentially become an ignition source in a hazardous (classified) location.
Figure 500-2
Intent: A new definition and FPN was added to alert the Code user that portable or transportable devices such as battery powered tools and equipment could potentially become ignition sources in a hazardous location.

Author’s Comment: The NEC is an “installation standard” and battery-operated equipment does not fall within the scope of this Code. A task group was formed to perform testing with respect to battery-powered devices and it is expected that the testing will reveal that battery-powered devices have insufficient energy to cause ignition in a hazardous location. However, workplace safety enforcement agencies, such as OSHA, can and do regulate the use of battery-operated equipment in hazardous locations. For more information on UL requirements concerning this topic, visit

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