What Sets Apart Intrinsically Safe Lights from Explosion Proof Lights?
Introduction:
Explosion-proof and intrinsically safe lighting are two common classes of lighting used in hazardous environments. The main difference between the two is the approach to preventing explosions. Explosion-proof lighting is designed to contain an ignition and prevent it from spreading to the surrounding atmosphere. On the other hand, intrinsically safe lighting controls the source of ignition and ensures that there is not enough energy to cause an explosion.
To certify lighting systems as intrinsically safe, there are international safety standards that must be met. These include certifications from FM Approvals, ANSI, and UL. These standards ensure that the electronics or wiring in the lighting cannot spark and that the surface temperature of the equipment does not reach the ignition temperature of gases or vapors.
Explosion-proof lighting, on the other hand, is housed in enclosures made of stainless steel or cast aluminum. These enclosures are designed to prevent internal sparks from causing external explosions. However, explosion-proof lighting does not guarantee survival in an actual explosion.
There are three classes and two divisions of hazardous atmospheres that lighting fixtures are judged against. Class 1 consists of gases and vapors, Class 2 consists of combustible dust, and Class 3 consists of combustible fibers and “flyings”. These classes are divided into Division I and Division II based on the concentration of gases or vapors that are likely to cause an explosion.
Intrinsically safe lighting is low-powered and often uses low-voltage bulbs like LEDs. The amount of electrical energy used is limited to non-incendive levels to prevent sparks in hazardous atmospheres. Intrinsically safe lighting can be controlled by ambient temperature and incorporate temperature sensors to limit energy based on the temperature.
Explosion-proof lighting is more expensive due to the need for conduit, enclosures, and seals. It also requires vigilant maintenance checks to detect any damage or leaks. On the other hand, intrinsically safe lighting involves less wiring and does not require stringent maintenance routines.
In conclusion, intrinsically safe lighting is considered superior to explosion-proof lighting for use in hazardous locations. It prevents ignition from occurring in the first place, eliminating the risk of explosions.
Full Article: What Sets Apart Intrinsically Safe Lights from Explosion Proof Lights?
Exploring the Differences Between ‘Explosion Proof’ and ‘Intrinsically Safe’ Lighting
The Two Classes of Lighting
‘Explosion Proof’ and ‘Intrinsically Safe’ are the two most common classes of lighting used to prevent explosions in hazardous environments. These classes include handheld, portable, and wearable lighting, as well as complete facility lighting systems. The main difference between the two classes lies in their approach to preventing explosions.
The Containment Method: Explosion Proof
The ‘Explosion Proof’ method allows ignition to occur, but prevents it from spreading to the surrounding atmosphere where it could become dangerous. This is achieved by housing the lighting in enclosures made of stainless steel or cast aluminum that are designed to contain any internal explosion caused by sparks.
The Prevention Method: Intrinsically Safe
The ‘Intrinsically Safe’ method, on the other hand, focuses on controlling the source of ignition to ensure that enough energy is never present to cause an explosion. This method is considered to be the safest and most effective way of preventing explosions.
Applicable Standards
There are several international safety standards that certify lighting systems as Intrinsically Safe. These include the FM Approvals certification, the ANSI/ISA 60079-1 standards from the American National Standards Institute, and the UL 1203 certification from United Laboratories. These certifications ensure that the electronics and wiring within the lighting equipment are incapable of sparking or generating enough energy to ignite hazardous gases or vapors.
Explosion Proof Standard
It’s important to note that an explosion-proof classification does not guarantee that the lighting will survive an explosion. Instead, it means that the lighting is housed in an enclosure that will prevent any internal sparks from causing an external explosion. The enclosures are typically made of stainless steel or cast aluminum and are designed to contain any internal explosion caused by sparks.
Hazardous Atmospheres
There are three classes and two divisions of hazardous atmospheres that lighting fixtures are judged against. Class 1 consists of gases and vapors, Class 2 consists of combustible dust, and Class 3 consists of combustible fibers and “flyings”. Each class has two divisions: Division I, where the hazardous gases or vapors are always present at sufficient concentrations to pose an explosion hazard, and Division II, where the gases or vapors may be present, but are not likely to be at sufficient concentrations to cause an explosion.
How Intrinsically Safe Lighting Works
Intrinsically safe lighting is designed to operate at low power levels, often incorporating batteries and rechargeable batteries. These lights often use low-voltage bulbs, such as LEDs, to limit the amount of electrical energy used. By keeping the amperages and voltages at non-incendive levels, sparks are prevented from occurring in hazardous atmospheres. Examples of intrinsically safe lighting include halogen flashlights and high-intensity discharge lights (HID).
The Pros and Cons of Explosion Proof vs Intrinsically Safe
Explosion Proof devices allow for ignition to occur, but contain it to prevent external explosions. However, the wiring and maintenance of explosion-proof lighting can be expensive and require constant vigilance. On the other hand, Intrinsically Safe devices never allow ignition to happen in the first place, making them safer and easier to maintain. Wiring is also less involved, and there is no need for stringent maintenance routines.
In Summary
Intrinsically Safe lighting is widely regarded as the superior choice for use in hazardous locations. It provides a safer method of prevention by controlling the source of ignition and eliminating the risk of explosions. Choose Intrinsically Safe lighting for a reliable and secure lighting solution in hazardous environments.
Summary: What Sets Apart Intrinsically Safe Lights from Explosion Proof Lights?
Explosion Proof and Intrinsically Safe are two well-known classes of lighting used to prevent explosions in hazardous atmospheres. The main difference between the two is that Explosion Proof lighting contains the ignition within the enclosure, preventing it from spreading, while Intrinsically Safe lighting controls the source of ignition and never allows enough energy for ignition to occur. Intrinsically Safe lighting is considered the safest method of prevention and is certified by international safety standards. On the other hand, Explosion Proof lighting is housed in enclosures that prevent internal sparks from causing external explosions. Intrinsically Safe lighting is low-powered and often uses low-voltage bulbs like LEDs. It is designed to limit the amount of electrical energy used and prevent sparks in hazardous atmospheres. On the other hand, Explosion Proof lighting is not limited to low-voltage units and requires expensive wiring and maintenance. Intrinsically Safe devices never allow ignition to occur, even in fault conditions, and do not require stringent maintenance routines. In summary, Intrinsically Safe lighting is considered superior to Explosion Proof lighting for use in hazardous locations.
Frequently Asked Questions:
Frequently Asked Questions about Intrinsically Safe vs Explosion Proof Lights: What’s the Difference?
Q: What are Intrinsically Safe Lights?
A: Intrinsically safe lights are designed to be used in hazardous environments where flammable gases, dust, or fibers are present. These lights are engineered to prevent the possibility of sparks, arcs, or high temperatures that could cause ignition and lead to explosions. They are certified and approved for use in classified areas.
Q: What are Explosion Proof Lights?
A: Explosion proof lights are also designed for use in hazardous locations where flammable vapors or combustible dusts can be found. These lights are constructed with robust materials, enclosures, and seals, ensuring that if there is any internal explosion or flame, it will not ignite the surrounding flammable substances or gases present in the atmosphere. Explosion proof lights are certified to meet stringent safety standards.
Q: How do Intrinsically Safe and Explosion Proof Lights differ?
A: While both types of lights are intended for use in hazardous environments, their design and safety features differ:
1. Intrinsically Safe Lights: These lights are specifically engineered to prevent any possibility of ignition within the light itself. They are designed with low energy outputs and temperature restrictions to eliminate potential sparks or arcs. Intrinsically safe lights do not require a heavy and robust enclosure like explosion proof lights.
2. Explosion Proof Lights: These lights are built with robust enclosures and materials that can contain an internal explosion. They are designed to withstand external pressure without allowing the flammable substances to ignite. Explosion proof lights have an added level of protection due to their sturdy construction.
Q: Can Intrinsically Safe and Explosion Proof Lights be used interchangeably?
A: No, they cannot be used interchangeably. While both types of lights are designed for hazardous environments, each has unique safety features and certifications. The selection of the appropriate lighting solution depends on the specific requirements and classification of the hazardous area. Choosing the wrong type of light can compromise safety and result in dangerous situations.
Q: How can I determine if I need Intrinsically Safe or Explosion Proof Lights?
A: To determine the appropriate lighting solution, you should consult the classification of the hazardous area as defined by safety regulations and guidelines. Understanding the presence of flammable gases, dust, or fibers, along with the nature of the environment, will help you determine whether you require intrinsically safe or explosion proof lights. Consulting with safety experts or lighting professionals can provide further guidance in selecting the right lighting solution.
Q: What are some important certifications to look for in these lights?
A: When choosing either intrinsically safe or explosion proof lights, it is crucial to ensure they meet relevant safety certifications. Common certifications include ATEX, IECEx, UL, CSA, and FM. These certifications validate that the lights have undergone rigorous testing and comply with the safety standards for hazardous locations.
Q: Can I install Intrinsically Safe or Explosion Proof Lights myself?
A: Due to the complexity and stringent safety requirements of hazardous locations, it is recommended to consult professionals who specialize in installing lighting solutions for hazardous environments. They possess the expertise and knowledge required to select and install the appropriate lights in compliance with safety regulations.
