What defines Group C gases?

Group C gases are specifically characterized by their flammability, with a minimum ignition energy that can be ignited within a certain range of mesh sizes. The term MESG, or Minimum Energy Spark Gap, refers to the energy required to produce a spark that can ignite the gas. For Group C gases, this range is between .45 to .75 mm, making them flammable and able to catch fire when mixed with air and exposed to an ignition source.

Understanding the properties of Group C gases is essential for fire alarm systems, as they require certain precautions and detection methods to mitigate the risk associated with their flammable nature. This classification helps define how these gases behave in fire safety scenarios, allowing for proper systems to be put in place to protect against potential hazards.