What is the difference between wdz electric wire and WDZN electric wire?

What is the difference between wdz electric wire and WDZN electric wire?

WDZ low smoke halogen-free flame retardant power cable.

WDZN low smoke halogen-free fire-retardant cross-power cable.

W-halogen-free, D-low smoke, Z-flame retardant, N-fireproof, YJ-crosslinked polyethylene insulation, V-polyvinyl chloride sheath YJV-crosslinked polyethylene insulated polyvinyl chloride thin sheath power cable.

Elimination Principle in Model: Copper is the main conductor material used in electric wire products, so the code T of copper core is omitted, except bare wire and bare conductor products. Bare wire and bare conductor products, power cable products, electromagnetic wire products do not indicate large class codes, electric wire and communication electric wire for electrical equipment are not listed but specify the small class or series codes.

Item 7 is a mark for various special occasions or additional special use requirements, marked with alphabet after "-". Sometimes in order to highlight the item, this item is written to the front. Such as ZR - (flame retardant), NH - (fire-resistant), WDZ - (low smoke, halogen-free, enterprise standards), TH - (for hot and humid areas), FY - (termite prevention, enterprise standards) and so on.