2.1.1

K: Rubber cross in the core of the cable 
C: Conductive metallic sheath over the stranded conductors or between inner and outer sheaths 
CG: Conductive non-metallic sheath over the stranded conductors or between inner and outer sheaths 
CE: Conductive metallic sheath over the insulating sheaths of the outer conductor 
CGE: Conductive non-metallic sheath over the insulating sheaths of the outer conductor 
R: Round wire reinforcement 
RL: Reinforcement made of round wire strands 

2.1.2

/3: Protective conductor evenly distributed in the interstices 
/3E: Protective conductor evenly distributed over the insulating sheaths of the outer conductor 
KON: Concentrically arranged protective conductor between inner and outer sheaths 
ST: Control element inside the cable 
FM: Monitoring element inside the cable 
ÜL: Monitoring lines inside the cable