Both explosion-proof and flameproof enclosures are made of metal only and can resist the explosion. The joints of these enclosures restrict the escaping gases so that the gases do not ignite the flammable or volatile gases that a hazardous area may contain. The explosion-proof electrical enclosures are widely used in countries including Canada and the United States. These enclosures have heavier construction when compared to flameproof enclosures. While the explosion-proof enclosures are tested to contain five times of the maximum pressure that an explosion may bring on to them, the flameproof enclosures (for projects with IEC standards) are tested to a maximum pressure of up to 1.5 times of the maximum pressure that may be exerted on them during an explosion.