Hazardous Location Emergency Lights Summary

When emergency lights are used in processing facilities and manufacturing plants, they have different safety specifications than standard emergency lighting. These emergency lights are specially designed for use in hazardous locations that contain flammable materials like ignitable gases and vapors. Hazardous Location Emergency Lights are sealed to protect internal electrical components, ensuring reliable emergency illumination.

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All types of lighting, whether it be emergency or traditional lighting, contain electrical components that would ignite in the presence of flammable gases, vapors, or dusts. Emergency lights installed in environments that contain these hazardous materials must meet proper specifications to avoid fire.

Hazardous Location Emergency Lights are categorized by classes and divisions, which correlate to which elements will surround the fixture and the operating environment of the emergency light.

Defining Hazardous Location

What constitutes a hazardous location is defined by the National Electric Code (NEC) and International Electric Code (IEC). These organizations set standards for all emergency lights and make clear specifications for Hazardous Location Emergency Lights to ensure safe and reliable operation of these fixtures. Although these sets of regulations are different, there are many aspects that overlap between the two. Always check with fire authorities and local building inspectors to make sure an appropriate Hazardous Location Emergency Light is installed. 

All Hazardous Location Emergency Lights are categorized according to class and division. The NEC defines class as what type of elements the fixture can withstand, while division is defined as how often the fixture will encounter these elements. By choosing an emergency light with the appropriate class and division, reliable and safe function is ensured.

Classes:

• Class 1: flammable gas or vapor
• Class 2: flammable dust
• Class 3: flammable fibers or flyings

Divisions

• Division 1: flammable materials are present during normal conditions
• Division 2: flammable materials are present during abnormal conditions, meaning the fixture is exposed only occasionally

Hazardous Location Design

Hazardous Location Emergency Lights are generally designed to withstand class 1 materials in either division 1 or division 2 environments. If a fixture is division 1 rated, it is also, by default, division 2 rated. If an emergency light is class 1 rated, on the other hand, it may not be safe for class 2 environments. Many Hazardous Location Emergency Lights overlap in terms on classes and divisions. Make sure to check the ratings of the emergency light against your installation's environment to ensure proper functionality. 

Hazardous Location Emergency Lights must be housed by components that will prevent ignitable materials from permeating the fixture and that ensure the housing is strong enough to endure moderate abuse.

Class 1 emergency lights feature a seal that completely protects internal electrical components from sparking flammable gases, creating a fire or explosion. Hazardous Location Emergency Lights must be handled and installed with care to ensure the housing's seal remains intact when the fixture is opened for inspection or repair.