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Text version of the page
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| 30 | ||||||||||||||||||||||||||||||||
| The flexible gasket and the cable sheath must form a flameproof joint through which no flames can penetrate. For this reason, attention must be paid to the appropriate selection of cable gland depending on both the type and structure of cable and installation location. If the flameproof enclosure has to be used in a IIC atmosphere or if a flameproof enclosure with a volume bigger than 2 dm3 has to be applied in Zone 1, the gaskets or cable glands have to be sealed. The flameproof enclosure primarily depends here on the care taken by the electrician when connecting the cables. Conduit System In the case of installation using the conduit system, the electrical lines are drawn as single wires into enclosed metal conduits. The conduits are connected to the housings by means of fittings and equipped with a seal at each entrance point. The entire conduit system is flameproof. The aim of the seal is to prevent explosions which may occur inside the housing from transmitting into the conduit. Otherwise, extremely high explosion pressures would be created as a result of pre-compression in long cylindrical tubes. For this reason, it is recommended that seals be installed not just at the entrance points but at specific intervals. Drains must be installed at low points at which condensate can accumulate. | ||||||||||||||||||||||||||||||||
| D.4 Mainte | ||||||||||||||||||||||||||||||||
| Periodic maintenance is required to maintain the safety of electrical installations in hazardous areas. Personnel who carry out such maintenance work should work under the guidance of an explosion protection expert and should be informed of the particular hazards involved (skilled person, IEC 60079-17). Before corrective maintenance, it must be ensured that there is no danger of explosions occurring during this work. Normally, formal written work-permission for this should be acquired from the company management. On completion of the work, a documentation should be kept of what work was carried out, and confirmation given that all relevant regulations have been observed. A technical person with executive function shall be identified for each installation. He is responsible for the determination of the frequency of inspection, the grade of inspection, the availability of the documentation, the training for the skilled personel, etc. | ||||||||||||||||||||||||||||||||
| R.STAHL explosion protection | ||||||||||||||||||||||||||||||||