ZR-RVV Flame Retardant Flexible Cable: ZA, ZB, ZC Ratings and Global Standards
For procurement engineers, EPC contractors, and electrical project buyers, specifying a flame retardant flexible cable that meets international fire safety codes is non-negotiable. The ZR-RVV cable delivers exactly that: a flame-retardant, copper-core, PVC-insulated, PVC-sheathed flexible cable manufactured to stringent GB/T 18380 standards, which are equivalent to IEC 60332-3. Before production even begins, our ISO 9001:2015 certified factory qualifies raw materials and conducts full spark testing, voltage withstand, and insulation resistance checks on every reel. Third-party test reports, factory audit visits, and full traceability are available on request. In the following guide, we clarify the ZA, ZB, ZC and ZR designations so you can specify the right flame retardant class with confidence—whether your project is in North America, Europe, or Southeast Asia.
What Is ZR-RVV Cable?
ZR-RVV is a flame-retardant flexible cable designed for internal connection and control wiring. Its full technical description is a flame-retardant copper-core PVC-insulated PVC-sheathed flexible cable. It is also commonly referred to as lightweight PVC-sheathed flexible cord, or simply flexible sheathed cable.
Typical applications include internal wiring of switchboards, control panels, household appliances, lighting fixtures, and building electrical systems where a flexible, flame-retardant solution is required.
ZR-RVV Cable Designation: Letter Code Meaning
Each letter in the ZR-RVV code describes a specific construction or performance attribute:
ZR: Flame Retardant (defaults to Class C when no additional letter is added)
R: Flexible conductor structure (stranded copper) for connection use
V: PVC insulation
V: PVC sheath
Flame Retardant Classes: ZA, ZB, ZC, and ZR Explained
Flame retardant cables are categorized into A, B, and C classes according to their ability to limit vertical flame spread in a bunched cable test.
ZA designates Class A flame retardant (highest performance)
ZB designates Class B flame retardant
ZC designates Class C flame retardant
ZR without a suffix is generally understood as Class C flame retardant
Flame retardant performance ranking: ZA > ZB > ZC
These designations apply both to building wire and to power distribution cables, allowing engineers to match the fire resistance class to the installation environment.
Testing Standard: GB/T 18380-2008 and IEC 60332-3
The classification of ZA, ZB, ZC flame retardant cable is based on GB/T 18380-2008, which adopts the methodology of IEC 60332-3. This standard evaluates a cable’s ability to resist vertical flame propagation when installed in a bundled configuration on a vertical ladder.
Test criteria for each class:
Class A (ZA): Cables are mounted on a vertical test ladder with a non-metallic material volume of 7 L/m. The burner flame is applied for 40 minutes. After combustion ceases and the sample is wiped clean, the maximum extent of charring (damaged portion) must not exceed 2.5 m above the burner bottom.
Class B (ZB): Non-metallic material volume of 3.5 L/m, flame applied for 40 minutes. Maximum char height must not exceed 2.5 m above the burner bottom.
Class C (ZC/ZR): Non-metallic material volume of 1.5 L/m, flame applied for 20 minutes. Maximum char height must not exceed 2.5 m above the burner bottom.
Note: Class A requires the largest volume of non-metallic material for the test, which translates to the most demanding fire performance criteria.
Frequently Asked Questions (FAQ)
Q: What is the difference between ZR, ZA, ZB, and ZC in flame retardant cables?
A: ZA, ZB, and ZC correspond to Class A, B, and C flame retardant ratings under GB/T 18380 (IEC 60332-3). ZA provides the highest flame retardant performance, while ZC (commonly written as ZR) meets the standard for Class C. The core difference lies in the volume of non-metallic material tested and the combustion test duration.
Q: What is ZR-RVV cable used for?
A: ZR-RVV is a flexible connection cable suitable for internal wiring of control cabinets, appliances, building electrical systems, and light industrial panels. Its PVC sheath and stranded copper core provide good flexibility and moderate mechanical protection in dry indoor environments.
Q: Are ZR-RVV cables compliant with IEC, CE, or UL standards?
A: ZR-RVV cables are manufactured to GB/T 18380 (identical to IEC 60332-3) and can be supplied with CE declarations and IEC test reports. Full UL certification is not native to ZR-RVV, but we can produce cables with UL-recognized components or equivalent constructions for North American projects upon request. We provide the actual test reports and certificates with each shipment.
Q: Can I get custom core counts, color codes, or OD/ODM branding on ZR-RVV cable?
A: Absolutely. We support fully customized configurations—including core count, cross-section (mm² or AWG equivalent), sheath color, and your brand marking on the cable jacket or packaging. Send us your specification sheet and we will confirm the technical feasibility within 24 hours.
Q: What is the minimum order quantity (MOQ) and lead time for a trial shipment?
A: For first-time evaluation, we accept low MOQs (starting from 500 meters for in-stock specifications). Custom constructions may have a small engineering setup quantity. Standard production lead time is 7–15 working days, depending on order volume and complexity. Express air freight samples are available for urgent qualification.
Get a Project-Specific Quote and Datasheet Today
Choosing the correct flame retardant class directly impacts fire safety compliance and project sign-off. If you need a ZR-RVV, ZA-RVV, or ZB-RVV cable with verifiable test reports, competitive lead times, and international trade support, our engineering team is ready to assist.
Send us your cable specifications or project layout today, and our technical team will provide a detailed quote and full data sheet within 24 hours. Whether you need OEM private labeling, custom packaging, or third-party inspection coordination, we will tailor every detail to your procurement requirements.