Datasheet · Building wire
BYJ 450/750 V
LSZH cross-linked polyolefin insulated wire
Single-core copper building wire with halogen-free, low-smoke cross-linked polyolefin (XLPO) insulation. For fixed wiring in buildings, conduits and trunking — especially where smoke and toxic gas must be kept to a minimum.
Cu conductorXLPO insulation450/750 V1.5 – 240 mm²90 °CJB/T 10491—2022
General data
- Model
- BYJ (WDZ-BYJ for LSZH flame-retardant)
- Rated voltage U₀/U
- 450/750 V
- Cores
- 1
- Nominal cross-section
- 1.5 – 240 mm²
- Product standard
- JB/T 10491—2022
- Conductor
- Annealed copper
- Conductor class
- Class 1 solid (1.5 – 6 mm²) or Class 2 stranded, per GB/T 3956 (IEC 60228)
- Max. conductor temperature
- 90 °C
- Flame / smoke
- Halogen-free, low-smoke insulation; flame-retardant class (e.g. WDZ) to be stated in the order
Construction
- ConductorAnnealed copper. Solid (class 1) for small sizes, compact or round stranded (class 2) above 6 mm².
- InsulationCross-linked polyolefin (XLPO), halogen-free, low-smoke. Colours to order; yellow/green for earth.
Dimensions & electrical data
| Nominal areamm² | Conductor classGB/T 3956 | Insulation thicknessspecified, mm | Overall diametermax. average, mm | Insulation resistancemin. at 90 °C, MΩ·km | Conductor resistancemax. at 20 °C, Ω/km |
|---|---|---|---|---|---|
| 1.5 | 1 | 0.7 | 3.2 | 0.011 | 12.1 |
| 1.5 | 2 | 0.7 | 3.3 | 0.010 | 12.1 |
| 2.5 | 1 | 0.8 | 3.9 | 0.010 | 7.41 |
| 2.5 | 2 | 0.8 | 4.0 | 0.009 | 7.41 |
| 4 | 1 | 0.8 | 4.4 | 0.0085 | 4.61 |
| 4 | 2 | 0.8 | 4.6 | 0.0077 | 4.61 |
| 6 | 1 | 0.8 | 5.0 | 0.0070 | 3.08 |
| 6 | 2 | 0.8 | 5.2 | 0.0065 | 3.08 |
| 10 | 2 | 1.0 | 6.7 | 0.0065 | 1.83 |
| 16 | 2 | 1.0 | 7.8 | 0.0050 | 1.15 |
| 25 | 2 | 1.2 | 9.7 | 0.0050 | 0.727 |
| 35 | 2 | 1.2 | 10.9 | 0.0043 | 0.524 |
| 50 | 2 | 1.4 | 12.8 | 0.0043 | 0.387 |
| 70 | 2 | 1.4 | 14.6 | 0.0035 | 0.268 |
| 95 | 2 | 1.6 | 17.1 | 0.0035 | 0.193 |
| 120 | 2 | 1.6 | 18.8 | 0.0032 | 0.153 |
| 150 | 2 | 1.8 | 20.9 | 0.0032 | 0.124 |
| 185 | 2 | 2.0 | 23.3 | 0.0032 | 0.0991 |
| 240 | 2 | 2.2 | 26.6 | 0.0032 | 0.0754 |
Source of values: insulation thickness, overall diameter and insulation resistance are the requirements of JB/T 10491—2022, Table 4. Conductor resistance is the maximum for plain copper per GB/T 3956—2008 (equivalent to IEC 60228). Values are limits the product must meet, not typical measured values; test reports for a specific batch are available on request.
How to read the model code
WZ-BYJ 450/750 1×2.5 (B) JB/T 10491—2022 GB/T 19666
WZHalogen-free (W) flame-retardant (Z)
BYJFixed-wiring wire, XLPO insulation
450/750Rated voltage, V
1×2.5One core, 2.5 mm²
(B)Stranded class 2 conductor; (A) = solid
Need BYJ, BV or another size?
Send the model, size, colour and quantity. MOQ 500 m · stock sizes 3–5 days · custom 7–15 days.