How to read a cable code: guides per coding system
How to read a NEC 402 cable code
A NEC 402 designation (USA) is a row of letter groups, and each group stands for one part of the cable: conductor, insulation, screen, armour, sheath, or the standard it follows. The decoder knows 16 symbols for this system. Below: real designations read step by step, then every symbol grouped by the part of the cable it describes.
Real designations, read step by step
RK 25 450/750V SVART
Verified designation, from: www.ahlsell.se
Every symbol, by part of the cable
Coding system
| F | Fixture Wire, Standard Stranding |
Conductor
| FF | Fixture Wire, Flexible Stranding |
Insulation compound
| S | Silicone Rubber |
| H | 75°C Insulation |
| HH | 90°C Insulation |
| R | Thermoset Insulation |
| T | Thermoplastic Insulation |
| -1 | Insulation Thickness (Thinnest) / 0.030" (0.742 Mm) |
| -2 | Insulation Thickness (Normal) / 0.045" (1.143 Mm) |
| -3 | Insulation Thickness (Thickest) / 0.060" - 0.110" (1.524 2.794 Mm) |
| X | Cross-Linked Polymer Insulation |
| K | Aromatic Polyimide Tape Insulation |
Screen and braid
| G | Glass Braid |
Sheath compound
| N | Nylon Jacket |
Other
Common questions
What does T mean in a NEC 402 cable code?
T means Thermoplastic Insulation.
What does P mean in a NEC 402 cable code?
P means Perfluor (Ethylene Propylene - FEP - Teflon).
What does N mean in a NEC 402 cable code?
N means Nylon Jacket.
What does H mean in a NEC 402 cable code?
H means 75°C Insulation.
What does R mean in a NEC 402 cable code?
R means Thermoset Insulation.
What does X mean in a NEC 402 cable code?
X means Cross-Linked Polymer Insulation.
Read by the deterministic decoder of this site from its symbol tables. Check the manufacturer's datasheet before you specify a cable.