Cable product diagnostics and quality control often make it necessary to perform not only quantitative measurements of cable parameters, which is quite a labor-intensive task, but also to perform quality and serviceability monitoring of these products as a whole. Such monitoring is appropriate, for example, in the process of wires and cables rejection during their manufacture, as well as in field conditions on overhead power lines, when it is important to determine whether their parameters meet the operating requirements rather than to assess the numerical value of a particular parameter, for example, the conductive core or insulation resistance value. To solve this problem, the method of operative nondestructive tolerance control was developed for cable products. A reference wire section of finite length, identical to the controlled electrical wire with parameters that fully correspond to the standardized values of its conductive elements and insulation, is used as a quality criterion. A block diagram implementing this method was proposed. The main operating feature characterizing this hardware implementation is the use of an instrumental amplifier with a differential input and operating in the scaling subtractor mode. An implementation variant of the developed method for operational tolerance nondestructive testing was also proposed without using an additional reference comparison object. As compared with other common control methods, the developed ones can provide operational capabilities improvement due to integrated control of both conductive and insulating cable product properties, as well as their application area expansion.