Single Core PVC / XLPE Insulated Building Wire (BV, BYJ, BLV, THHN)
Building Wire
Single-core copper or aluminium wire for fixed installation in conduit, trunking and distribution boards
Building wire is single-core insulated wire pulled through conduit or laid in trunking for the fixed wiring of buildings: lighting and socket circuits, board tails and sub-circuit feeds. We make it with copper or aluminium conductors, PVC, XLPE or LSZH insulation, and a nylon-jacketed THHN / THWN version for projects written to North American sizes.
What is Building Wire?
Building wire is the single-core wire an electrician pulls into conduit or lays in trunking and then leaves in place for the life of the building. It has insulation only, no outer sheath, so it relies on the conduit, trunking or enclosure for mechanical protection. That is the main thing that separates it from the other pages in this range.
Our factory table lists four Chinese designations and one North American family. BV is copper with PVC insulation, BYJ is copper with XLPE insulation, BLV and BLYJ are the aluminium equivalents. THHN, THWN and THWN-2 are copper wire with PVC insulation and a nylon jacket, offered in AWG and kcmil sizes. On our BV parameter sheet, 1.5–6 mm² is a single solid wire and 10 mm² and above is stranded (7 to 61 wires); other conductor constructions are confirmed against the standard on your order.
BV and BLV are covered by our CCC certificate 2002010105016709 for the voltage and size ranges listed in the certificate table below. BYJ, BLYJ and THHN / THWN are not on a CCC or CB certificate we hold, so they are built and tested to the standard named on your order.
Choose this page for fixed wiring. If the wire needs tight routing or connects to panels and equipment, see Flexible Electrical Wire (BVR). If you want a sheathed two-core-plus-earth cable clipped to the surface or run in walls without conduit where local wiring rules permit, see Twin & Earth Cable. If you only need the green/yellow protective conductor, see Earth / Ground Cable.
Key features
- Rated voltage 300/500 V, 450/750 V or 0.6/1 kV
- Copper, aluminium or tinned copper conductor; BV sheet: solid wire 1.5–6 mm², stranded 10–300 mm²
- PVC insulation standard; XLPE or LSZH optional
- Nylon jacket on THHN / THWN / THWN-2
- Single core, 0.5–400 mm²; THHN 14 AWG to 1500 kcmil
- FR, FRLS, LSZH, LSOH and LSHF versions available
Typical applications
- Lighting and socket circuits pulled through conduit in residential and commercial buildings
- Wiring inside trunking, cable ducts and switchgear enclosures
- Distribution board tails and sub-circuit feeds on fixed routes
- Projects specified with BV / BYJ designations, or with THHN / THWN in AWG sizes
- Aluminium BLV / BLYJ where the specification allows aluminium conductors
Building Wire Models — Single Core
Source: Huanghe factory product data
Custom sizes available on request — send us your project specification.
| Model | Structure | Description | Voltage | Cores | Nominal cross-section |
|---|---|---|---|---|---|
| BV | Cu / PVC | Copper core, PVC insulated wire | 300/500 V, 450/750 V, 0.6/1 kV | Single core | 0.5, 0.75, 1, 1.5, 2.5, 4, 6, 10, 16, 25, 35, 50, 70, 95, 120, 150, 185, 240, 300, 400 mm² |
| BYJ | Cu / XLPE | Copper core, XLPE insulated wire | 300/500 V, 450/750 V, 0.6/1 kV | Single core | 0.5, 0.75, 1, 1.5, 2.5, 4, 6, 10, 16, 25, 35, 50, 70, 95, 120, 150, 185, 240, 300, 400 mm² |
| BLV | Al / PVC | Aluminium core, PVC insulated wire | 300/500 V, 450/750 V, 0.6/1 kV | Single core | 0.5, 0.75, 1, 1.5, 2.5, 4, 6, 10, 16, 25, 35, 50, 70, 95, 120, 150, 185, 240, 300, 400 mm² |
| BLYJ | Al / XLPE | Aluminium core, XLPE insulated wire | 300/500 V, 450/750 V, 0.6/1 kV | Single core | 0.5, 0.75, 1, 1.5, 2.5, 4, 6, 10, 16, 25, 35, 50, 70, 95, 120, 150, 185, 240, 300, 400 mm² |
Verified Factory Documents — Building Wire
Source: China Compulsory Certification (CCC) certificates issued by CQC to Henan Huanghe Wire & Cable Co., Ltd.
Only the models, voltages and sizes written on the certificate are covered. BYJ, BLYJ and THHN / THWN are not listed on any CCC or CB certificate we hold. ISO 9001 / 14001 are management-system certificates and do not certify a product.
| Document | Validity | Standard on the certificate | Scope written on the certificate |
|---|---|---|---|
| CCC 2002010105016709 | valid 21 Apr 2023 – 20 Apr 2028 | GB/T 5023.3-2008 / IEC 60227-3:1997; JB/T 8734.2-2016 | 60227 IEC 01 (BV) 450/750 V 1.5–240 mm²; 60227 IEC 05 (BV) 300/500 V 0.5–1 mm²; BV 300/500 V 0.75–1 mm²; BLV 450/750 V 2.5–300 mm² (also lists RV-90 and BVR) |
BV Single Core 450/750 V — Factory Parameter Sheet
Source: Huanghe factory parameter sheet (1-core BV)
Values are copied from the factory sheet. Current ratings are not shown because the sheet does not state the installation conditions; ask for ratings against your installation method. Colours: yellow, green, red, blue, black, yellow/green or to order. PVC, 70 °C.
| Size (mm²) | Wires × diameter (mm) | Insulation (mm) | OD approx. (mm) | Weight approx. (kg/km) | Max. DC resistance 20 °C (Ω/km) | AC test (kV / 5 min) |
|---|---|---|---|---|---|---|
| 1.5 | 1 × 1.36 | 0.7 | 2.8 | 20.6 | 12.1 | 2.5 |
| 2.5 | 1 × 1.73 | 0.8 | 3.4 | 30.7 | 7.41 | 2.5 |
| 4 | 1 × 2.20 | 0.8 | 3.8 | 44.9 | 4.61 | 2.5 |
| 6 | 1 × 2.69 | 0.8 | 4.3 | 63.7 | 3.08 | 2.5 |
| 10 | 7 × 1.34 | 1.0 | 6.0 | 108 | 1.83 | 2.5 |
| 16 | 7 × 1.68 | 1.0 | 7.0 | 165 | 1.15 | 2.5 |
| 25 | 7 × 2.10 | 1.2 | 8.5 | 257 | 0.727 | 3 |
| 35 | 7 × 2.53 | 1.2 | 9.4 | 360 | 0.524 | 2.5 |
| 50 | 10 × 2.53 | 1.4 | 11.0 | 475 | 0.387 | 2.5 |
| 70 | 14 × 2.53 | 1.4 | 12.7 | 664 | 0.268 | 2.5 |
| 95 | 19 × 2.53 | 1.6 | 14.7 | 916 | 0.193 | 2.5 |
| 120 | 24 × 2.53 | 1.6 | 16.4 | 1125 | 0.153 | 2.5 |
| 150 | 30 × 2.53 | 1.8 | 18.0 | 1410 | 0.124 | 2.5 |
| 160 | 32 × 2.53 | 1.8 | 19.7 | 1550 | 0.12 | 2.5 |
| 200 | 40 × 2.53 | 2.2 | 21.9 | 1930 | 0.0904 | 2.5 |
| 240 | 48 × 2.53 | 2.2 | 23.0 | 2225 | 0.0754 | 2.5 |
| 300 | 61 × 2.53 | 2.4 | 25.4 | 2770 | 0.0601 | 2.5 |
THHN / THWN / THWN-2 — PVC Insulated, Nylon Sheathed
Source: Huanghe factory product data
| Model | Structure | Cores | Sizes |
|---|---|---|---|
| THHN / THWN / THWN-2 | Cu / PVC / nylon | Single core | Solid: 14, 12, 10 AWG. Stranded: 8, 6, 4, 3, 2, 1, 1/0, 2/0, 3/0, 4/0 AWG; 250, 300, 350, 400, 500, 600, 750, 1000, 1250, 1500 kcmil |
Building Wire Material Ratings
Source: Huanghe factory product data
| Item | Value |
|---|---|
| PVC — max. service temperature | 70 °C |
| PVC — max. short-circuit temperature | 160 °C (max. 5 s) |
| XLPE — max. service temperature | 90 °C |
| XLPE — max. short-circuit temperature | 250 °C (max. 5 s) |
| Min. installation temperature | 0 °C |
| Min. service temperature | -40 °C (fixed and protected installations) |
Need diameters, weights and coil packing for your sizes?
Insulation thickness, overall diameter and weight follow the standard named on your order, so we issue them per order rather than from a generic table. Send the model, sizes, colours, standard and coil or drum length, and we reply with a datasheet for that build.
What to send us for a building wire quote
- Model: BV, BYJ, BLV, BLYJ or THHN / THWN / THWN-2
- Size per line item (mm² or AWG / kcmil) and quantity
- Conductor: solid or stranded, and the conductor class named in your standard
- Insulation: PVC, XLPE or LSZH; any FR / LSZH requirement
- Whether you need the CCC-covered BV / BLV range, or another certificate for your market
- Insulation colours and quantity per colour
- The standard named in your specification
- Packing: coil length (e.g. 100 m) or drum, and destination port
Building Wire gallery
Factory & delivery capability
Real photos from our production facility — from raw material to container loading.
Production Line
Quality Testing
Warehouse & Stock
Drum Packaging
Container Loading
Ready to Ship
Frequently asked questions about Building Wire
Q.What is the difference between BV and BYJ wire?
Both are single-core copper building wire. BV has PVC insulation rated 70 °C in service; BYJ has XLPE insulation rated 90 °C in service. Choose BYJ when the specification asks for XLPE or a higher conductor temperature.
Q.Is building wire the same as flexible wire?
No. BV building wire is a single solid wire up to 6 mm² and 7 to 61 thick strands above that, and is meant for fixed runs in conduit or trunking. BVR uses more, thinner strands (for example 19 × 0.41 mm at 2.5 mm²), so it is easier to route and terminate. For connection leads see our Flexible Electrical Wire page.
Q.Is your building wire CCC certified?
BV and BLV are, within the ranges on certificate CCC 2002010105016709 (valid to 20 Apr 2028): BV 450/750 V 1.5–240 mm², BV 300/500 V 0.5–1 mm² and BLV 450/750 V 2.5–300 mm². BYJ, BLYJ and THHN / THWN are not on that certificate. Sizes outside those ranges are built to the standard on your order.
Q.Do you make THHN wire?
Yes. THHN, THWN and THWN-2 are copper wire with PVC insulation and a nylon jacket, from 14 AWG solid up to 1500 kcmil stranded.
Q.Can I get aluminium building wire?
Yes. BLV is aluminium with PVC insulation and BLYJ is aluminium with XLPE insulation, in the same 0.5–400 mm² range as the copper types.
Q.Is low smoke halogen-free building wire available?
Yes. LSZH insulation is an option, and FR, FRLS, LSOH and LSHF versions are also produced. State the requirement on your inquiry.
Q.How is building wire packed?
Smaller sizes are usually packed in coils, larger sizes on drums. Tell us the coil or drum length and any printing you need on the wire and packaging.
Related products and how they differ
Flexible Electrical Wire (BVR / BVVR)
Multi-strand wire for panel and equipment wiring and tight routing. Building wire is for fixed runs.
View specifications →Twin & Earth Cable (BVVB)
Flat, sheathed 2-core + earth cable for fixed wiring without conduit where local wiring rules permit. Building wire has no outer sheath.
View specifications →Earth / Ground Cable
Green/yellow single-core protective conductor for bonding and earthing only.
View specifications →Related Technical Guides
Learn more about Building Wire specifications, installation, and sourcing.
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Read guide →Ready to source Building Wire from the factory?
Send your specs — model / size / conductor class / insulation / colours / coil length / destination port. Quote within 24 hours.
Checking compliance before you enquire? Factory ISO 9001 and CCC certificates and test reports. Product standards and certificates are confirmed per model, market and order.