Mike Dolt Enterprises
Mike Dolt Enterprises
User: jmargolis79, Location: minneapolis
Asked on: Thursday, April 14, 2011 at 9:25 pm EDT
Answered on: Tuesday, May 14, 2024 at 4:13 am EDT
Question: I have a pipe rack 250'+ that shares both elec and gas piping. Most of it was class 1 div 2. They have removed some of the gas venting for about 100' that caused the div 2 area. Now I have the boundry seals 100 feet from the new boundry. I 6+ 1inch pipes, so i would like not to have to pull all the wire back to add seals in the middle of this run. Could we just leave the area classified without the hazard being present? Any other solutions?
Leaving the Area Classified Without Hazard Present
According to the National Electrical Code (NEC), Class 1 Division 2 areas are classified as locations where flammable gases or vapors are not normally present, but may occasionally be present in hazardous concentrations. If the gas venting has been removed, it is unlikely that hazardous concentrations of gas will be present in the remaining area. However, leaving the area classified as Division 2 without the hazard being present is not recommended for the following reasons: Safety Compliance
Maintaining the electrical classification ensures that equipment and wiring meet the necessary safety standards for hazardous locations.
Insurance and Liability
Insurance companies may deny coverage for equipment and electrical systems installed in non-compliant areas.
Future Hazard
Leaving the area classified as Division 2 provides a cushion in case the gas venting is restored or a new hazard is introduced.
Other Solutions
Instead of leaving the area classified without the hazard present, consider the following solutions: Reinstall Gas Venting
This is the most straightforward solution and ensures compliance with the NEC.
Expansion Joint Seals
Install expansion joint seals at the boundary between the Class 1 Division 2 and non-classified areas. These seals provide a barrier against the potential entry of flammable gases.
Purge System
Install a purge system with a small amount of inert gas flowing through the conduit to prevent the accumulation of flammable gases.*
Reclassify Area
If a detailed assessment determines that the hazard is negligible, you may consider an application to the authority having jurisdiction (AHJ) to reclassify the area as non-hazardous. However, this process requires thorough documentation and justification.
Recommended Approach
The recommended approach is to reinstall the gas venting to ensure the area is properly classified and meets the necessary safety standards. Alternatively, you may consider expansion joint seals or a purge system as effective methods to maintain the classification while mitigating the hazard.It is important to consult with a licensed electrician and the AHJ to determine the most appropriate solution for your specific situation. Flag for review