In places where the spark or heat from electrical equipment can cause an explosion or start a fire, the components are housed in purpose-built electrical enclosures, which are called explosion proof enclosures. According to the NEMA, these enclosures do not specifically need to withstand an exterior explosion, rather they are designed to contain an interior explosion and prevent it from spreading outside the enclosure. This prevents an even larger explosion that can damage property and put human life at risk.