What is meant by a flameproof enclosure? How are flameproof standards defined?
Flameproof does not mean FLAME RETARDANT or FIRE PROOF.
FLAMEPROOF means EXPLOSIONPROOF
The enclosure for the electrical equipment is hydraulic tested and a TEST CERTIFICATE is made by MANUFACTURER and signed by QA Manager.
Some issue FAKE TCs without testing.
If they teated the equipment wud fail if the walls are not thick and strong enuff or if blow holes are present in the casting
An enclosure is supposed to be flame proof, if, after placing it in an environment of specified air gas mixture, a spark created to ignite the air gas mixture within the enclosure, does not cause the flame to emerge and ignite the air gas mixture outside the enclosure. The main criteria in the design of such enclosures are to provide sufficient flame path and maintain the specified air gap between the mating surfaces, thus avoiding the emergence of the flame from within the enclosure. Also the material of construction and the enclosure wall thickness is such that it can sustain the internal detonation pressure in the event of its occurrence. The withstanding pressure depends upon the internal volume of the enclosure. During manufacture each enclosure is hydraulically tested to ensure its ability to withstand such pressures. The gasses encountered in Industrial applications are categorized into groups I, IIA, IIB and IIC. Details of gasses contained in the groups can be obtained from IS
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