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CENELEC IEC EEx-d |
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Flame Proof Weather Proof Explosion Proof |
NEWSLETTER - February 2010
In each area in which there is a process that causes a raising of temperature of flammable substances and their evaporation, such as hydrocarbons, can produce a leak of gas or of vapor which, in contact with flames or sparks caused by electrical processes, may explode. This event can happen both during normal operations and in case of breakdown or accident.
Talking about these events, it is usually to cite a refinery as an example because it is, perhaps, the place where an explosion can easier happen. But the same conditions can occur in other chemical plants, or even in simple and seemingly innocuous places, such as, a painting room or a room where charge forklift batteries.
Therefore, within any facility or establishment where can be, even for limited periods of time, the presence of flammable gases or vapors in percentages that could cause an explosion, it is important to determine the hazardous areas and design electrical systems in order to eliminate the possible causes of an explosion.
In areas with risk of explosion because of the presence of gas, the cable entry into junction boxes can be done using cable glands.
With reference to CEI EN 60079-14 standard, the cable entry into junction boxes that contain sparkling equipment in Zone 1, with the presence of hydrogen or acetylene or volumes greater than 2 dm2, must be done using "barrier" type cable glands. This type of cable glands provides the sealing of each wire before their installation.
Cortem produces a whole series of “barrier” cable glands which are used both for armored and not armored cables. They are manufactured with Ex "d" protection and they prevent flames from spreading outside the housing.
In Ex "e" cable glands, the wires sealing prevents gas from spreading throught the cable sheath avoiding it to reach control rooms or safety rooms.
After IEC (International Electrotechnical Commission) work and CENELEC harmonization process in 2009, IEC has published, in recent weeks, two new standards for the classification of hazardous areas with the presence of flammable substances.
The two new standards are:
The two standards will replace respectively the CEI EN 60079-1 (CEI 31-30) and CEI EN 61241-10 (CEI 31-66) standards and take the following two new names in Italian territory:
The two previous rules remain effective until the 1st of June 2012.
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