Halogens are non-metallic elements that produce toxic gases when exposed to fire.
Halogens are 17th group in the periodic table consisting of five chemically related elements: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At).
The most important tests of Halogen Free cables are smoke density, flame emission, pH and conductivity, oxygen index, heat index, and fluorine test.
The production structure of Halogen Free wires and cables is similar to the production structure of low voltage wires and cables, but with the main difference that it does not use raw materials with halogenated properties.
It is also possible for customers to use mica tape to increase the temperature tolerance of wires and cables up to 750 ° C.
Production standard for cables in Iran is national standard 3569-1 (equivalent to IEC 60502-1 international standard) and for wires is BS EN 50525-3-31.
The following tables show the symbols and letter abbreviations of this type of wire:
Abbreviations Symbol for low voltage wires
| H | Designed based on harmonized standards |
| 05 | 300/500 V |
| 07 | 450/750 V |
| Z1 | Halogen free Insulation |
| -K | Flexible conductor (Class 5) |
| -U | Solid conductor (Class 1) |
| -R | Stranded conductor (Class 2) |
Abbreviations Symbol for low voltage cables
| N | Designed according to DIN VDE standard |
| A | Aluminum Conductor |
| [blank] | Copper Conductor |
| 2X | XLPE Insulation |
| C | Concentric Conductor |
| H | Halogen free granule |
| R | Wire Armour |
| B | Tape Armour |
Abbreviations Letter for low voltage cables
| CU | Copper Conductor |
| AL | Aluminum Conductor |
| XLPE | Crosslink Polyethylene |
| CWS | Copper Wire Screen |
| CTS | Copper Tape Screen |
| Lsfoh | Halogen free granule |
| STA | Steel tape armour |
| SWA | Steel wire armour |
| ATA | Aluminum tape armour |
| AWA | Aluminum wire armour |
| PET | Polyester tape |
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