NEK TS 606 : 2009 Cable Code Designation

Cable Code Designation by Material (Multi-Letter System)

This system uses 4 letters to describe different parts of a cable:
- 1st letter: Insulation 
- 2nd letter: Bedding / Inner Covering 
- 3rd letter: Armour / Screen 
- 4th letter: Outer Sheath

Material	1. letter	2. letter	3. letter	4. letter
Fire resistant tape + insulation	B
Ethylene propylene rubber (EPR)	R
Cross-linked polyethylene (XLPE)	T
Thermoplastic compound	I
Fibre, tight buffered	A
Fibre in loose tube	Q
Fire resistant silicone	S
Bedding / Inner covering or taping		F
Aluminium (laminated to outer jacket)			L
No armour			X
Tinned copper wire braid			O
Strength member of yarn			A
Galvanized steel wire braid			C
Thermoplastic compound (SHF1)	I			I
Thermoset compound (SHF2)				U
Mud resistant thermoset compound (SHF2 MUD)				U
Mud resistant thermoplastic compound				B

These designations are used in offshore, marine, and industrial cable specifications like NEK 606 or IEC 60092 series.

Example:
TCXFOU 
→ T = XLPE insulation 
→ C = Galvanized steel wire braid (armour) 
→ F = bedding 
→ U = SHF2 mud-resistant outer sheath