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Deciphering the NYM marking N - indicates that this brand is manufactured in accordance with the German Normenleitung standard, Y - indicates the insulation material that covers the cable cores, in this case it is polyvinyl chloride or PVC for short, M - indicates the presence of an outer sheath in the cable , comes from the German Mantelleitung, Specifications: Rated voltage - can be used in electrical networks with a supply voltage of not more than 660 V and a frequency of 50 Hz. Rated operating current - is determined by the cross section of the conductor, as well as an adjacent parameter - the maximum allowable current that can flow for a short time in emergency situations. Temperature limits - the temperature value in which NYM can normally perform its functions without losing the set parameters and destroying any elements. For NYM cable, the limit is from - 50? C to + 50? C. Core resistance - is set for each specific cable individually and determines its bandwidth or allowable amperage. Insulation resistance - determines the dielectric properties of the insulating layer, both between conductors and from each conductor to conductive elements that may touch the outer sheath. Bending radius - should not exceed 4 outer diameters of the cable itself. Advantages and disadvantages: In comparison with other types of cable and wire products presented on the domestic market, NYM cable has a number of significant advantages: It is not afraid of moisture - in comparison with domestic models with vinyl insulation, NYM is much less susceptible to moisture absorption. Due to this, NYM can also be laid in wet areas (basements, wells, mines, etc.) without additional devices. Flexibility - easily changes the geometric shape and can be laid in the most inaccessible places, make turns, etc. This property is provided by the intermediate layer. Does not support combustion - due to the composition of the intermediate layer, the insulation does not burn, but only melts when exposed to a flame or spark. This property allows the use of NYM in areas with increased fire hazard. It has a wide variety of design options, both in terms of the number of cores and their cross section, due to which one such cable can provide full-fledged power supply in circuits with a different number of phases, wires and for any load. But, in addition to the above advantages, NYM has some disadvantages. Firstly, the high quality of all NYM brand cables also determines their higher cost, in comparison with domestic counterparts, for example, the same VVGng. Secondly, NYM is not recommended for installation in areas where it can be exposed to sunlight. Since its insulation loses its characteristics from the sun, and the cable fails much faster. Application The NYM cable is used as a device for the transmission of electrical energy in power circuits. Wide distribution
№179234 Created: May 23 2022
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