The invention relates to a method for monitoring an electrical heating apparatus and to a corresponding apparatus. The lighting system includes a plurality of sensors and a light-emitting unit. The substrate layer comprises a plurality of core-shell particles wherein the core is a conductive particle and the shell is a fluoroplastic dispersed in a fluoroelastomer. The DWDM system then occupies that channel with a scalable number of DWDM wavelength channels, for example four, eight, or sixteen. A receptor having a preference for pyrimidine nucleotides over purine nucleotides means a receptor for which pyrimidine nucleotides and purine nucleotides are not equally active and equipotent. The flange comprises, in a housing formed in the frame, a mobile support for supporting said clamping and holding lugs at least partially emerging through a through-hole of the frame, that ends in said housing, and means for the continuous control of the movement, clamping, holding and release of the lugs in the clamping direction.