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Cable glands - 9224 application guide

determine conditions of use, i.e.industrial, hazardous area. Before cable gland products can correctly be selected tosuit the user’s application, there are a number of variable factors that need to be determined. Without this infor- mation it is difficult to make an accurate selection or rec- ommendation. Some of these factors may include location, installation code of practice, environmental conditions, industrial or classified hazardous area, type of equipment and details of the cable to be used.Here are some general guidelines that may help to identifythe appropriate cable gland product to suit your situation. General cable gland selection guidelines > determine environmental conditions > if ExnR, restricted breathing enclosure, does the cabledirectly enter the main enclosure > determine type of cable, armoured or non-armoured > determine type of armour and thickness, where applicable > entry hole type, drilled and tapped (threaded) or clearance hole > determine cable overall diameter > entry hole thread form and sizeOnce the above information has been identified, the personcarrying out selection is more able to make an informed decision about which product should be used from the choices available. Please note that selection and installation should be carried out in line with good engineering practice, observing the requirements of the prevailing code of practice (e.g. IEC 60079-14), and in accordance with the instructions provided. IEC 60079-14 requires that the selection and installations of equipment shall be carried out only by competent persons whose training has included instruction on the various types of protection and installation practices, relevant rules and regulations and on the general principles of area classification. The competency of the person shall be relevant to the type of work to be undertaken. > determine cable inner bedding diameter, where applicable > determine enclosure type and configuration > determine whether there is any potential for the couplingof dissimilar metals (e.g. brass and aluminium) > determine entry hole type and size > determine any access limitations or space restrictions > determine any special earthing or EMC requirements > determine accessories required, where applicableIf the cable glands are intended for use in flammable atmospheres (hazardous areas), the following additional points may help your selection process: > what is the protection method of the equipment, e.g. Exd, Exe, Exn > which gas group is the equipment rated for service inIIA, IIB or IIC > if Exd, is the cable directly entering the main enclosure > if Exd, is there a source of ignition inside the enclosure > if Exd, is the enclosure volume less than or greater than 2000cm
3 > if Exn, is the enclosure a restricted breathing (Ex nR)enclosure