CABLES & CABLE ACCESSORIES
11
Torque test: This ensures that the cable gland can be installed and function correctly with sufficient clamping on the cable armour or compression of the seal(s). It also checks the strength of the entry threads against overtightening, as that is usually the weakest part of the cable gland. Ingress protection Cable glands should have an IP rating equal to or higher than that of the enclosure. Glands are therefore tested to SANS 60529 and are typically required to have IP ratings of IP66 and IP68. (See Figure 4)
Electromagnetic Compatibility (EMC) This is the ability of the equipment, cables, or electrical systems to function satisfactorily in their electromagnetic environment without introducing intolerable electromagnetic disturbances to any other equipment in that environment. Because electromagnetic emissions can be affected by the quality of the connection through the gland to the cable armour or metallic sheath and to the equipment testing according to EN 55011 and EN 55022 EMC standards, Class B radiation emissions demonstrate EMC compatibility. Low Smoke Zero Halogen (LSOH) With an increase in the amount of cable installed in residential, commercial, industrial, public buildings, metro rail tunnels, and underground mining operations, the specification of LSOH cables and accessories is increasingly becoming mandatory. During a fire, LSOH cables will emit less optically dense smoke, which makes exiting a space easier for its occupants as well as increasing visibility during firefighting and rescue operations. With zero halogen cables, the chance of toxic gases accumulating, which are life-threatening to people and corrosive to electrical and instrumentation equipment, is significantly reduced. To match the LSOH characteristics of the cable, it is necessary for the seals, gaskets, and shrouds of cable glands to meet the same LSOH standards as the cables. Testing to EN 45545-2, IEC 61034-2, and IEC 60754-2 standards demonstrates LSOH compliance.
Figure 10: The graph shows the emission from the cable without sufficient earthing through the gland.
Electrical properties Tests to determine the suitability of cable glands and any associated earth tags under short- circuit fault conditions satisfy the following criteria: • Equipotential bonding to electrical equipment. • Equipotential bonding to metallic layer(s) of cable. • Protective connection to earth. • Electrical current test of up to 43 kA rms. Figure 4: CCG A2 compression gland with proven tapered seal rated at IP68 up to a depth of 850 m.
Figure 11: The graph shows a dramatic reduction in emissions from the same cable when earthed through a CCG cable gland.
bringing power to your product JHB: 011 452 1415 DBN: 031 304 9757 CT: 021 511 8143
Figure 8
Figure 5
Figure 9
Conclusion As modern electrical systems and designs are becoming ever more high-tech and sophisticated, equipment and cables used in such systems must comply with various improvements made in safety and performance standards. It is therefore imperative that cable glands that are used to terminate, seal, and maintain adequate earth continuity and IP ratings between the cables and equipment need to perform to similar high standards. Only cable glands that can demonstrate independent testing and certification to these standards should be selected for use in modern electrical system installations. According to SANS 10142, it is now a legal requirement that only glands that are certified to the latest SANS 1213 Edition 3 standard may be installed.
Tested to IEC 61238-1 Quality Copper/Aluminium Lugs & Ferrules
Quality Copper XLPE Lugs & Ferrules
Figure 6
18V Crimping Tools
C Shaped Copper Connectors & Bi-metalic Lugs and Ferrules
Figure 7
In addition to the test criteria in SANS 1213 Edition 3, other design properties, such as EMC and Low Smoke Zero Halogen (LSOH), are increasingly relevant for modern electrical systems.
www.stonestamcor.co.za
Enquiries: www.ccgcablegland.co.za
SPARKS ELECTRICAL NEWS
SPARKS ELECTRICAL NEWS
OCTOBER 2024
JANUARY 2026
Made with FlippingBook flipbook maker