Which non-flammable gas is commonly used in electrical equipment?

SF6 gas, or sulfur hexafluoride, is widely used in electrical equipment due to its exceptional insulating properties and low flammability. Its molecular structure allows it to effectively prevent electrical discharges, making it an ideal choice in switchgear, circuit breakers, and other high-voltage equipment. Additionally, SF6 has a high dielectric strength, meaning it can withstand significant voltage levels without breaking down, enhancing safety and reliability in electrical systems.

The use of SF6 is particularly advantageous because it helps to minimize the risk of electrical faults and related fires, thereby improving the overall safety of electrical installations. Its non-flammable nature is critical in avoiding hazards associated with flammable gases, making it a preferred option in environments where electrical equipment operates.

Conversely, other gases listed may not exhibit the same level of non-flammability or insulating performance. Chlorine gas, for instance, is toxic and not typically used for such applications, while nitrogen gas is inert but does not provide effective insulation. Carbon dioxide, while non-flammable, is also not ideal for insulation purposes in the context of high-voltage electrical equipment. Thus, SF6's unique properties position it as the leading choice among non-flammable gases used in this field.