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Trefoil clamps are used for high voltage single core cables where the current rating is high and 3 core cables are not available. Sumip trefoil clamps are used for laying single core cables in trefoil touching formation, which helps to maintain magnetic symmetry thereby avoiding electromagnetic heating and loss of current. These clamps have been moulded from virgin glassfibre filled material and tested satisfactorily at CPRI to withstand 50 kA short circuit fault current with spacing between trefoil clamps kept at a one-meter distance. Advantages: high mechanical strength; centre distance between trefoil clamps can be increased for lower fault level than 50 kA and hence total requirement of clamps can be reduced, thereby reduction in cost; long service life as practically not affected by all chemicals, acids and alkali; design of clamp and good flexural strength gives good grip on cable and accommodates slight deviation in diameter of cable. These trefoil clamps are supplied with bolts, nuts and washers, which are generally MS zinc passivated but galvanised, SS hardware can be supplied against specific requirement; flame retardancy feature can be provided against specific requirement; and aluminium trefoil clamps can also be supplied if required. Mechanical properties: tensile modulus ? 19000 kg/cm2; flexural modulus ? 9750 kg/cm2; izod impact strength ? 8.0 kg cm/cm of notch; volume resistivity ? 1014 to 1015 Ohm-Cm; surface resistivity ? 1012 to 1013 Ohm; and melting point ? 216?C.
INDUSTRIAL PRODUCTS FINDER (IPF) is India’s only industrial product portal. Referred to as the ‘Bible’ of the manufacturing sector in India,
INDUSTRIAL PRODUCTS FINDER (IPF) is India’s only industrial product portal. Referred to as the ‘Bible’ of the manufacturing sector in India,
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