YJV Cable Cross-Reference: GB/T 12706 vs IEC 60502 and BS 5467

01What a low-voltage power cable is, before the code letters

A low-voltage power cable carries the main supply from a transformer or a distribution board to the loads downstream of it. The job it has to do is narrower than a building wire's: it is fixed for its whole life, it carries a defined load current that decides its cross-section, and it may have to survive being pulled into a trench, buried, or hung in a shaft. That combination is what the standards below are written around.

All four systems land on the same physical recipe for the common product:

• Conductor: annealed copper or aluminium, solid or stranded — the cross-section is set by the load current and the volt-drop allowance, not by the type code.
• Insulation: cross-linked polyethylene (XLPE), rated 90 °C continuous with a short-circuit allowance of 250 °C, so the cable can carry more current per square millimetre than an older PVC-insulated cable of the same size.
• Sheath: a PVC (or, where fire emission matters, a low-smoke halogen-free) oversheath. In the Chinese code the sheath is a separate letter from the insulation; in the IEC and BS codes it is the last layer in the layer string.
• Voltage: a 0.6/1 kV class as the standard low-voltage rating — 0.6 kV phase-to-earth, 1 kV phase-to-phase.
• Armour (optional): steel tape or steel wire, added when the cable is buried or pulled. In the IEC and BS codes it appears in the layer string; in the Chinese code it is the two-digit suffix.

Where they diverge is exactly what a buyer trips over: whether the standard named on the certificate is the one the project specified, what the armour digits mean, and whether the cable you were quoted is the halogen-free construction or the PVC one. The rest of this page works through those one system at a time.

02GB/T 12706.1: the Chinese reference, and the MOD that matters

China's standard for this cable is GB/T 12706.1-2020, Power cables with extruded insulation and their accessories for rated voltages from 1 kV (Um = 1.2 kV) up to 35 kV (Um = 40.5 kV) — Part 1: Cables for rated voltage of 1 kV (Um = 1.2 kV) and 3 kV (Um = 3.6 kV). It was published on 2020-03-31, took effect on 2020-10-01, and replaced the 2008 edition; it is a 53-page document under ICS 29.060.20, committee SAC/TC 213.

The scope fixes the limits: it covers the construction, dimensions and test requirements of extruded-insulation power cables for rated voltages of 1 kV (Um = 1.2 kV) and 3 kV (Um = 3.6 kV), for fixed installation in distribution networks or industrial installations, and it explicitly excludes cables for special conditions — overhead networks, the mining industry, nuclear power plants (inside and around the containment area), and underwater or shipboard use.

The single most misquoted fact on a YJV datasheet

The cover of GB/T 12706.1-2020 states its relationship to the international standard directly: it is IEC 60502-1:2004 modified from — the adoption code is MOD, not IDT. The two numbers are not interchangeable and the standards are not identical; a Chinese cable made and tested to GB/T 12706.1-2020 is not automatically to IEC 60502-1:2004, and the reverse is also true. That distinction matters the moment a specification asks which edition the cable is tested to, or a tender lists the two numbers side by side as if one proved the other.

03The YJV code, decoded field by field

The Chinese designation is a product-code string rather than a compact position code. Its logic is a sequence of attribute letters followed, where applicable, by two armour digits, and the worked example in the standard's own product-designation annex is the thing to read against. The rule for the letters is simple to state and easy to get wrong: YJ is the insulation, and the sheath letter that follows it is a different material.

Reading the common members of the family

Once the letters are fixed, the variants in everyday use fall out of them directly. YJV is the plain copper XLPE/PVC cable for trays, ducts and conduits, with no armour. YJLV is the same construction on an aluminium conductor — cheaper and lighter, so it is common on longer runs where the load allows the larger cross-section aluminium needs. YJV22 adds double steel-tape armour for direct burial and crush resistance; YJV32 and YJV42 add fine and coarse round steel wire armour respectively, for shafts and risers where the cable carries its own weight. YJY swaps the PVC oversheath for polyethylene — useful where moisture rather than fire emission is the constraint. A flame-retardant prefix (ZR-), a low-smoke halogen-free prefix (WDZ-) and a fire-resistant prefix (NH-) go in front of the type and point to the flame and smoke performance, which is governed by a different standard family than the base cable type.

Decoded from the GB/T 12706.1 product-designation annex (Annex E gives the model-designation table and the arrangement order), corroborated by the published type descriptions on our own YJV product page. The library holds the standard's cover, contents and scope but not its numeric tables, so no table value or clause number is quoted here.

04IEC 60502-1: the international counterpart

The international standard for this product family is IEC 60502-1, Power cables with extruded insulation and their accessories for rated voltages from 1 kV (Um = 1.2 kV) up to 30 kV (Um = 36 kV) — Part 1: Cables for rated voltages of 1 kV (Um = 1.2 kV) and 3 kV (Um = 3.6 kV). Where the Chinese standard uses a type code, IEC names the cable by its layers, and that layer string is the thing a buyer has to read on an international datasheet.

The construction string is built outward from the conductor. CU/XLPE/PVC is the plain copper, XLPE-insulated, PVC-sheathed cable for indoor and trench installation where it does not have to take external mechanical force. Add steel tape and it becomes CU/XLPE/PVC/STA/PVC — the STA (steel tape armour) between two PVC layers, for indoor or direct-burial routes that do have to take mechanical force. Add steel wire instead and it becomes CU/XLPE/PVC/SWA/PVC, for routes that also have to take a pulling tension. Swap CU for AL and the same three strings describe the aluminium versions. This layer-string convention is the reason an English-language datasheet for the same physical cable as a Chinese YJV reads completely differently: nothing about the product changed except the naming system.

Conductors, temperature and the 0.6/1 kV class

Across the IEC family the conductor is specified to IEC 60228 — Class 1 solid, Class 2 stranded, or Class 5 flexible — and the insulation is XLPE, rated 90 °C continuous with a 250 °C short-circuit allowance for up to five seconds. The standard low-voltage rating is 0.6/1 kV. These three facts are the same in the Chinese standard, which is exactly why the two families map so cleanly at the product level even though their documents differ.

05BS 5467 and BS 6724: the British armoured family

The British low-voltage armoured cable standard is BS 5467, Electric cables — Thermosetting insulated, armoured cables of rated voltages of 600/1000 V and 1900/3300 V for fixed installations, and the low-smoke counterpart is BS 6724, which carries the same construction with a low-smoke halogen-free sheath in place of PVC. Both editions in current use are the 2016 revisions, and the older BS 5467:1997+A3:2008 was withdrawn on 2016-04-30 — a date worth knowing when a datasheet cites the superseded edition.

The type is written as a layer string of the same kind IEC uses. Cu/XLPE/SWA/PVC at 0.6/1 kV is the multicore steel-wire-armoured cable for LV distribution where PVC is acceptable. BS 6724 versions swap both the bedding and the oversheath to LSZH. One rule runs through both standards and catches people out: single-core AC cables use aluminium wire armour (AWA), not steel, because a ferromagnetic steel enclosure around a single AC conductor produces induced eddy and hysteresis heating and derates the cable. That is why the single-core string is Cu/XLPE/PVC/AWA/PVC and not SWA.

Compiled from published BS 5467 / BS 6724 / IEC 60502-1 comparison material; the library holds no BS or IEC 60502-1 text, so only scope-level and construction-level facts are stated, with no clause numbers or table values.

06The cross-reference table

The table below maps the designations for the common 0.6/1 kV XLPE low-voltage power cable across the four systems. Read it as a mapping of product to product, not as a statement that any one certificate satisfies another jurisdiction.

The North American column is deliberately not filled with a type-code mapping: LV power cable in that system is covered by the UL 44 / UL 854 and ICEA families, which the library does not hold, so no letter-level correspondence is asserted. Cells that defer to "the listing" mean the value lives in the individual product listing, not in the standard's scope.

07What does not translate

Four misreadings cause most of the trouble when a low-voltage power-cable specification crosses a system boundary.

1. "Equivalent" is not the relationship GB/T 12706.1 has to IEC 60502-1

The adoption is MOD — modified from — and the covers say so. Writing the two numbers as if they were the same document overstates the relationship and can mislead a specification that asks which edition the cable is tested to. Say "modified from", and ask for the certificate scope if the question matters.

2. The sheath letter is not the insulation letter

YJV is YJ insulation plus V sheath. YJY is YJ insulation plus Y (polyethylene) sheath. The two letters after YJ in a longer code name two different layers, and reading YJY as "XLPE insulation twice" is a common error that hides a real change — PE sheath instead of PVC, which is a different fire and moisture behaviour.

3. Steel armour on a single-core AC cable is a design error, not a variant

Single-core AC circuits use aluminium wire armour because a ferromagnetic steel enclosure around a single AC conductor produces induced heating. A datasheet that offers a single-core "SWA" construction without addressing that is describing a cable that will derate or overheat in service.

4. Certification attaches to the construction, not the family

A certificate for one construction — one conductor material, one sheath compound, one armour type, one cross-section range — does not extend to another. Changing PVC to LSZH, or copper to aluminium, or adding armour where there was none, moves the product outside the tested scope. This is why the sheath print and the certificate scope are read together, and why the type code alone settles nothing.

08What this page publishes, and what it will not

The tables above are built from standard records, published scope text and manufacturer datasheets, and every voltage, temperature and adoption code in them is taken from a document listed in Sources rather than inferred from a letter string. Where a document was not available, the page says so and stops at the standard name: the GB/T 12706.1 layer-by-layer table comparison is not published here because the numeric tables were not obtained, the YJV designation is decoded without a clause number because the standard text was not fully held, and the North American column is left at the standard-family level rather than given a type-code translation that would not be sourced.

What this page does not do is decide a project. It will not tell you that a particular YJV cable satisfies a particular BS 5467 or IEC 60502-1 requirement on your job, because that depends on the build, the certificate scope and the accepting authority. Bring us the two specifications and the installation conditions, and we will work the comparison against a construction we actually build.