How to Read a Cable Type Code: YJV, ZR-YJV and WDZ-YJY

The code is a layer list

Chinese cable designations read as a sequence of material choices rather than as a product name. Taking the common power cable YJV 0.6/1 kV as the reference, the manufacturer's own selection sheet defines the letters directly:

YJ — XLPE insulation V — PVC sheath ZR — flame-retardant

So YJV is a copper-conductor cable with cross-linked polyethylene insulation and a polyvinyl chloride sheath. Adding the prefix ZR- gives ZR-YJV, which keeps the same insulation and sheath materials but changes the sheath compound to a flame-retardant PVC grade (FR-PVC). The electrical construction is otherwise unchanged.

The same cable written two ways

Export enquiries often arrive with the construction written as a material chain instead of a type code. CU/XLPE/PVC and YJV describe the identical build: copper conductor, XLPE insulation, PVC sheath.

This matters when comparing quotations. A supplier quoting CU/XLPE/PVC and another quoting YJV may be pricing the same cable, while a quote for CU/XLPE/FR-PVC corresponds to ZR-YJV. Reading the material chain rather than the shorter code removes that ambiguity before it reaches the technical bid evaluation.

Halogen-free variants

Where smoke and acid gas are the governing risk — tunnels, metro, data centres, public buildings — the sheath letter changes from V to Y. That gives WDZ-YJY at 0.6/1 kV: the same copper conductor and XLPE insulation with the PVC sheath replaced by a low-smoke zero-halogen compound, written out as CU/XLPE/LSOH.

The WDZ prefix is what marks the halogen-free, low-smoke, flame-retardant build. The designation then gains a further letter when the project also asks the cable to keep working while it is being burned: WDZAN-YJY is that variant, and its construction adds a mica tape over the conductor — CU/MICA/XLPE/LSOH. The mica tape is the layer that carries the circuit integrity, and it is the reason that construction is quoted under the fire resistant family rather than as a plain halogen-free cable.

What the code does not tell you

A type code names materials, not dimensions. YJV 0.6/1 kV covers a wide span of conductor sizes and core counts, and the current-carrying capacity of each is a function of size, installation method, ambient temperature and grouping — none of which appear in the designation.

Two further points regularly catch specifiers out. First, the same code is produced to different national standards: the manufacturer's sheets list IEC 60502 and GB/T 12706 for the YJV family, with BS, DIN and ICEA available on request, so the code alone does not fix the standard. Second, medium-voltage cables keep the short YJV form while adding conductor and insulation screens that are invisible in the code — which is why a medium-voltage enquiry should always be answered with a full construction statement rather than a type code.