Explosion-proof lighting prevents explosions from occurring in hazardous locations by containing any ignition or explosive reaction within the light fixture. These fixtures are normally installed in applications where an explosion risk exists within a contained environment. This type of lighting is ideal for use inside process vessels (tanks, silos, mixers, etc.) and other locations that can be observed from outside through sight glasses.
Explosion-proof lighting does not prevent an explosion—rather, it ensures that explosions and sparks are contained within the light fixture to ensure hazardous chemicals or gases are not ignited within the process vessel. Meeting explosion-proof lighting standards does not mean that the fixture will not be destroyed in an explosion, however, but merely means that it protects the external environment from internal reactions within the light fixture.
Explosion-proof classifications are set forth in Articles 500-506 of the National Electric Code (NEC) and National Fire Protection Association (NFPA) Publication 70. Light fixtures must meet these standards to be rated as explosion proof.
These categories are central to determining your explosion-proof lighting requirements. They are as follows:
- Class I hazardous locations are characterized by a high risk of explosion from highly-flammable or combustible gases, liquids, and other materials. There are two Divisions within Class I: Division I, where highly-flammable material is normally present, and Division II, when the material is present only during abnormal conditions.
- Class II hazardous locations are characterized by the presence of combustible dust and/or fibers. Although the danger of fire and/or explosions remains in these locations, it is less severe in comparison to the danger present in Class I locations. There are also two Divisions contained within Class II as well: Division I, when the combustible material is normally present, and Division II, when the combustible material is present infrequently or during abnormal conditions.
- Class III hazardous locations still contain ignitable dust and/or fibers, but not in sufficient quantities to pose a danger of an explosion. Like Classes I and II, Class III has two divisions: Division I, when the ignitable dust and/or fiber may be present during normal operations, and Division II, when the ignitable dust and/or fiber is present only under certain conditions.
These Classes are determined largely based on the severity/combustibility of the materials present in an area. Common examples of explosive/combustible materials in each class are as follows:
Class I is divided into the following groups:
- Group A: Acetylene
- Group B: Hydrogen
- Group C: Propane and Ethylene
- Group D: Benzene, Butane, Methane and Propane
Class II is divided into the following groups:
- Group E: Metal Dust
- Group F: Carbon & Charcoal
- Group G: Flour, Starch, Wood and Plastic
Class III materials are divided into the following:
Explosion-Proof Lighting by Papailias
Papailias Incorporated provides a wide range of lighting fixtures for your explosion-proof lighting requirements. These products include solutions in the following categories:
- Halogen Hazardous Location Lights provide high-intensity illumination for sight glasses and sight flow indicators, and can be used for lighting and viewing through a single port.
- High-Intensity LED (HI-LED) Hazardous Location Lights provide high-intensity illumination for sight glasses and sight flow indicators and can be used for lighting and viewing through a single port.
- Sanitary High-Intensity LED (HI-LED) Hazardous and Non-Hazardous Location Light Glasses combine explosion-proof light and sanitary sight glass assembly. The anodized aluminum parts provide greater cleanliness and aesthetic appeal, making the unit highly popular for pharmaceutical applications.
Papailias has an established history of developing unique solutions to overcome the challenges that process engineers face every day. Our explosion proof-lighting fixtures are guaranteed to safeguard hazardous locations from explosions, limiting their potential damage and harm. All our explosion-proof lighting solutions strictly adhere to all industry and government safety standards, ensuring that our products perform safely and according to expectations.
Papailias provides many explosion-proof lighting products to meet any need, and our team of experts can offer high-quality technical advice and cost-effective solutions for any process application challenge and design need. To learn more about how Papailias can provide products that meet the needs of your hazardous work areas, please request more information or contact us.