In order to use electrical and/or radio operated equipment in the presence of hazardous gas, it must be what?

Using electrical and/or radio operated equipment in areas where hazardous gas is present requires that such equipment is intrinsically safe or explosion proof classified. This classification ensures that the equipment is designed to operate safely in potentially explosive atmospheres. Intrinsically safe devices limit the energy available for ignition, thus preventing sparks or heat that could ignite a flammable gas. On the other hand, explosion-proof equipment is constructed to contain any explosion that occurs within the device itself, preventing the ignition of external hazardous atmospheres.

The necessity for this level of safety is anchored in regulations and safety standards aimed at protecting workers and the environment from the dangers posed by explosive gas mixtures. Equipment that is not specifically designed for these conditions could lead to catastrophic failures, fires, and injuries. Hence, the requirement for intrinsic safety or explosion proof classification is crucial in ensuring operational safety in hazardous environments.