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Industrial phones for hazardous areas are a specialized type of comms system designed to be used in locations where the presence of explosive substances or ignitable fibers poses a significant risk of arc faults.

The risk factors associated with these environments are so great that standard telephones would be a serious fire hazard if used in these places.

To address this issue, the International Electrotechnical Commission has developed a series of standards (IEC 60079) for electrical equipment used in hazardous areas.

In order to be used in hazardous areas, industrial telephones must meet the requirements of one of two groups of standards: Zone 1 and Zone 2 areas, or Division 1 and Division 2 areas. Zone 1 and Division 1 areas are those where the risk of a hazardous atmosphere being present is high, often due to routine maintenance procedures. Zone 2 and Division 2 areas are those where the threat of hazardous atmospheres is lower, typically due to infrequent situations.

Industrial telephones for hazardous areas must be designed and constructed with safety features to prevent arc faults from occurring. This includes the use of flameproof or dust-ignition-proof enclosures, intrinsically safe components, or explosion-Vandal proof Jail Telephone connections. The phones must also be able to withstand shocks and extreme thermal conditions, ensuring continuous operation in harsh environments.

In addition to the IEC regulations, local and national regulations such as the Explosives Act and the Hazardous Areas Directive must be adhered to when selecting and installing industrial telephones in hazardous areas. The selection of the correct telephone is crucial, and it is essential to ensure that the device has been certified by a recognized third-party testing organization, such as the IEC or the Factory Mutual Research Corporation.

When selecting an industrial telephone for hazardous areas, the end-user must consider several factors, including the type of area, the operating environment, and the level of protection required. Additional factors that must be considered are the security aspects of the telephone, its usability and ease of use, and its compatibility with local laws and standards.

In conclusion, industrial telephones for hazardous areas are critical in ensuring safe communication and emergency response in potentially hazardous environments. The selection and installation of these devices are governed by strict guidelines and laws, and wrong decisions can result in severe consequences. With careful consideration of the requirements and by selecting certified equipment, organizations can ensure a reliable and safe means of communication for their personnel and assets in hazardous areas.