Model type

Specifications

Dimensions

GZB GZR GZL

For installation of explosion-proof electrical equipment

Prior to installed of explosion-proof electrical equipments, careful study should be made on the following recommendations.
1. To prevent explosions or files caused by the electrical equipments, every effort should be made, as a prerequisite, to minimize possible danger of explosion at a location where they are to be installed.
2. The electrical equipments should be installed at a location with a minimum posibility of explosion. In case, however, they are unavoidably installed at a hazardous location where explosion is expected, it should be limited to a minimum extent.
3. The explosion-proof electrical equipments to be installed should be the products that have been proved to fully meet he requirements.

Classofication of danger class

Study the sorts of inflammable gas or steam present at a location where the electrical equipments are to be installed in order to determine the explosion class and the firing degree. Then, determine the hazardous locations according to the degree of danger of the locations where the electrical equipments are to be installed. The explosion-proof electrical equipments may be selected on the basis of the determination of explosion class, firing degree and hazardous locations.
The danger class of explosive gas is determined by the firing degree and explosion class.

Classification of hazardous locations

The areas of possible danger or to be dangerous atmosphere are classfield into class 0, class 1 and class 2 depending upon the dangerous time and frequency of occurrence of danger.

Class 0･･･Where dangerous density of explosive gas continues or is held for a long time above the lower limit of an explosion.

Class 1･･･Where a dangerous atmosphere is expected to be present under normal state.

Class 2･･･Where a dangerous atmosphere is expected to be present under abnormal state.

Type of explosion-proof construction

The explosion-proof construction is designed to protect the equipment in use at a hazardous location and can be divided into many different types including pressure-resisting explosion-proof(d), oil-immersed explosion-proof(o), internal pressure-resisting explosion-proof(f), increased safety explosion-proof(e), substantial safety explosion-proof(i), special explosion-proof(s) and other varying types. Out of them, the following construction types are employed in the explosion-proof electrical equipment introduced in this paper.

※ Pressure-resisting explosion-proof type(d)
　 This is of a totally enclosed construction, and should an explosion take place inside the enclosure, the enclosure resists the resultant pressure eliminating a danger of igniting an explosive gas outside.
※ Increased safety explosion-proof type(e)
　This is of the construction which is particularly provided with increased safety on its construction or temperature rise, in order to prevent sparking arcing and overheating on those parts which should not essentially generate them.

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