Introduction: two copper conductors for different tasks
PVS wire and VVG cable are the two most recognisable copper products in everyday life and construction. The first is flexible, in a round PVC sheath, familiar from extension cords and household appliances. The second is rigid or moderately flexible, with solid or stranded conductors, the backbone of home electrical wiring. They are often confused or one is mistakenly substituted for the other, but each has its own clearly defined scope. PVS is designed for movable connections, VVG for fixed installation inside walls, in trays and pipes.
Confusion arises from external similarity: both have copper conductors, both have a sheath made of PVC compound. However, the difference in conductor construction — multi‑wire fifth‑class flexibility in PVS versus solid or low‑strand in VVG — determines everything: from installation method to service life. More details on the characteristics and decoding of PVS can be found in the review detailed about PVS.
Comparative table of PVS and VVG
| Parameter | PVS | VVG |
| Type | Wire (not to be confused with a cable, although often called PVS cable in everyday speech) | Power cable |
| Conductor construction | Copper, stranded, class 5 flexibility according to GOST 22483 | Copper, solid or stranded, class 1 or 2 |
| Number of cores and cross‑section | 2 to 5 cores, cross‑section 0.75–10 mm² | 1 to 5 cores, cross‑section 1.5–240 mm² |
| Insulation and sheath | PVC, round sheath filling the gaps between cores | PVC insulation, PVC sheath; gaps between cores are not filled |
| Flexibility | Very high, bending radius — 5 diameters | Moderate, bending radius — 7.5–10 diameters |
| Rated voltage | 450/750 V (according to GOST 7399‑97) | 0.66 or 1 kV (according to GOST 31996) |
| Operating temperature | From –25 to +40 °C (installation not below –15 °C) | From –50 to +50 °C (installation without preheating down to –15 °C) |
| UV resistance | Low, not intended for outdoor exposed use | Low, not for outdoor use without protection |
| Fire safety | Not rated for fixed wiring; combustible, emits smoke | Versions ng, ng‑LS, ng‑FRLS — for buildings |
| Service life (in moving mode) | At least 6 years with frequent bending | Not intended for moving operation |
| Service life (fixed) | 10–15 years, then sheath loses elasticity | 25–30 years |
| Typical application | Extension cords, household appliances, temporary networks, connection of lighting and sockets inside panels (not concealed) | Concealed and exposed fixed wiring in houses, apartments, offices, laying in ground in pipes |
| Cost (copper, 3×2.5 mm², per metre) | Slightly higher due to complex conductor construction | Slightly lower |
Conductor construction and flexibility
The main difference between PVS and VVG is the structure of the current‑carrying conductor. In PVS wire, it is stranded from dozens of thin copper wires, providing fifth‑class flexibility. Such a conductor withstands repeated bending, coiling and vibration without damage. That is why PVS is present in every household extension cord and at the power input of a washing machine or refrigerator — wherever the cord moves.
VVG cable is made with solid conductors of the first class or low‑strand conductors of the second class. It is stiffer, withstands frequent bending less well, but holds its shape perfectly in chases and is reliably fixed in screw terminals of circuit breakers and sockets. A solid conductor does not “fray” during installation and ensures stable contact for decades. VVG is not suitable for moving equipment connections: after a dozen bend cycles, the conductor may break.
Insulation, sheath and laying conditions
Both use PVC compound, but with different formulations. The PVS sheath is more elastic, glides well and fills the gaps between cores, making the wire round and dense. This is convenient for extension cords, but reduces heat dissipation when installed fixed under load. VVG, on the other hand, has air gaps between cores, which improves heat dissipation and allows it to carry higher current for the same cross‑section.
PVS is not designed for laying in the ground, under plaster or behind drywall. Its sheath loses plasticity over time, cracks, and the construction itself is not intended for long‑term fixing in a wall. For concealed wiring in a house, and even more so for laying in ground in a protective pipe, VVG is required. The PVC sheath of VVG is resistant to weak acids and moisture, and when choosing the ng‑LS version, it also does not propagate combustion. More about the difference between ng and LS indices in VVG is written in the article VVGng or VVGng‑LS.
Permissible currents and power
The continuous permissible current for copper conductors with PVC insulation is determined by the PUE and depends on the cross‑section, number of cores and installation method. For a cross‑section of 2.5 mm², the most common in socket circuits, VVG in air carries 25‑27 A, and PVS carries roughly the same when laid open. However, for concealed wiring under plaster, PVS is not used according to regulations, so comparing them in this mode is incorrect. The real difference manifests during installation: the solid conductor of VVG dissipates heat better in static conditions, while flexible PVS coiled or under a rug heats up more.
For household socket groups protected by a 16 A circuit breaker, a cross‑section of 2.5 mm² is sufficient for both types. However, according to SP 256.1325800.2016, fixed wiring in residential rooms is performed only with cable, not flexible wire. Therefore, PVS may only appear as a cord from a socket to an appliance or as a temporary extension cord. A full list of cross‑sections and permissible loads for power cables is available in the catalogue VVG cable.
Service life, UV and fire safety
Manufacturers give PVS wire at least 6 years of service with frequent bending and up to 15 years in static conditions. After that, the sheath plasticiser hardens, cracks appear, and the insulation begins to crumble. VVG cable in fixed wiring lasts 25‑30 years, and versions with the ng‑LS index retain their properties even at elevated temperatures in switchboards.
Neither PVS nor VVG like direct sunlight. Ultraviolet degrades PVC, so outdoors both materials are used only in protective boxes or in special outdoor versions. Additionally, PVS is not certified according to fire safety standards for concealed wiring: it has no ng marking and releases dense smoke and toxic hydrogen chloride when burning. VVG in the ng‑LS version is permitted for installation in public buildings and on escape routes.
When to choose PVS wire
- Making extension cords, portable leads, splitters — flexibility and wear resistance come first.
- Connecting household appliances: washing machines, refrigerators, microwave ovens — factory cords are often analogous to PVS.
- Temporary lighting on construction sites or in garages, where the wire is laid openly and frequently moved.
- Repair of power tools, soldering wires inside switchboards when a flexible conductor is needed for confined spaces.
- White or black flexible cord for luminaires, chandeliers, wall lamps — aesthetics and convenience.
When to choose VVG cable
- Electrical wiring in apartments and private houses: concealed in chases, behind plasterboard, in floor screeds. Only VVG or its non‑flammable versions.
- Laying in ground in HDPE pipes or in cable ducts outdoors — provided UV protection is in place.
- Timber houses: VVGng‑LS is mandatory, as it does not support combustion and produces minimal smoke. PVS is prohibited for such wiring.
- Socket and lighting groups fed from the switchboard. Reliable contact in terminals and long service life.
- Facilities with fire safety requirements: offices, hospitals, shops, childcare institutions.
Typical mistakes when choosing and installing
- Laying PVS in chases under plaster. The sheath cracks over time, contacts in terminals loosen — creating a short‑circuit risk.
- Using VVG for extension cords or portable leads. The rigid cable is inconvenient, breaks quickly at bends and damages the insulation.
- Connecting a stranded PVS conductor to a screw terminal without a ferrule. Wires are crushed, some break off, the contact heats up.
- Substituting PVS with ShVVP or PUNP — they have different insulation classes and lower service life. For serious loads, only PVS with a passport and certificate should be used.
- Buying a thin white wire without markings and trying to put it into the wall — neither the cross‑section, nor the material, nor the permissible current is known.
- Laying PVS in the ground even in a pipe. Lack of sealing and mechanical weakness lead to insulation breakdown.
Frequently asked questions
What is the difference between PVS and VVG?
PVS is a flexible stranded wire of the fifth class, VVG is a rigid or semi‑rigid cable of the first or second class. PVS is intended for moving connections, VVG for fixed wiring.
Can PVS be used for sockets in a house?
For concealed fixed wiring — no. For temporary exposed installation in cable ducts — it is allowed, but not recommended due to shorter service life and lack of fire safety certification.
How is the marking PVS deciphered?
Wire with vinyl insulation and sheath, connecting. The letter “C” indicates that it is a wire, not a cable for fixed installation.
What is better for a timber house: PVS or VVG?
Only VVGng‑LS. PVS is not certified for concealed wiring and does not meet fire safety requirements in wooden buildings.
What maximum current does PVS 2.5 mm² carry?
With open laying — up to 30 A short‑term, continuously — about 25 A. For fixed wiring in a house, it is better to aim for 20‑25 A with a margin.
Where are white and black PVS used?
Sheath colour is decorative. White is more common for household extension cords and luminaires, black for tools and outdoor use, but neither is intended for permanent exposure to sunlight.
Conclusion
PVS and VVG are two copper tools, each tailored to its own task. Flexible PVS is indispensable in extension cords, household appliances, temporary networks — wherever the wire moves and bends. Rigid or semi‑rigid VVG is the foundation of safe and durable fixed wiring in homes, apartments and offices. Trying to substitute one for the other leads either to rapid wear and fire, or to inconvenient installation and breakage. Therefore, the correct answer to the question “PVS or VVG?” is not “which is better”, but “for what purpose”. You can browse the range of wires and cables in the section PVS wire, where all common cross‑sections and sheath colours are presented.
