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XVB 4G4 mm² is a rigid PVC-insulated electrical cable specially designed for fixed three-phase low-voltage electrical installations without a neutral conductor. Its robust construction with 4 solid copper conductors (3 phases + earth) with a cross-section of 4 mm² makes it the ideal cable for light to medium three-phase photovoltaic installations, industrial connections and balanced three-phase electrical distributions.
Main applications :
Key features :
Advantages:
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The XVB 4G4 mm² cable is a PVC-insulated, multi-conductor rigid electrical cable specially designed for medium-voltage, three-phase fixed electrical installations that do not require a neutral conductor. Its robust construction with 4 solid copper conductors (3 phases + earth) with a cross-section of 4 mm² makes it the cable of choice for three-phase photovoltaic installations from 4 to 6 kW, light industrial electrical distribution and pure three-phase load connections.
Complying with the Belgian RGIE (Règlement Général sur les Installations Électriques) and European standards HD 604 and EN 50575, this cable guarantees safety, reliability and economy for your balanced three-phase medium-power electrical projects.
The XVB 4G4 mm² cable (4 conductors without neutral) is specifically designed for medium-power balanced three-phase installations:
⚠️ Important: XVB 4G4 cable does NOT include a neutral conductor. It is only suitable for balanced three-phase installations. For installations requiring a neutral (single-phase + three-phase loads), use the XVB 5G4 cable (5 conductors with neutral).
Understanding the difference between these two cables is essential to choosing the right model:
How to choose?
Material and financial savings: By eliminating the neutral conductor not required for balanced three-phase installations, the XVB 4G4 cable offers a significant cost reduction compared with the XVB 5G4. This saving also has an impact on protection (four-pole circuit breakers instead of five-pole).
Optimised cross-section for medium power: With its 4 mm² cross-section, the XVB 4G4 cable offers an excellent compromise between carrying capacity (up to 34A when laid underground) and ease of handling. It is perfectly sized for three-phase photovoltaic inverters from 4 to 6 kW, a segment that is very common in Belgian residential installations.
Optimised installation: With one less conductor and an intermediate cross-section (4 mm²), the XVB 4G4 cable is more compact and lighter than higher cross-sections. Its smaller diameter makes it easier to fit in Ø20-25mm ducts and reduces the space required in cable trays.
Simplified electrical configuration: For 4 to 6 kW three-phase photovoltaic inverters operating in pure injection mode (without single-phase local consumption), the absence of a neutral simplifies wiring and avoids problems of imbalance between phases and neutral.
💡 Expert advice: always check the specifications of your inverter before choosing between XVB 4G4 and XVB 5G4. Some inverters necessarily require a neutral conductor for correct operation, even in three-phase. Consult the technical documentation for your UPS or contact our technical support.
The choice of XVB cable cross-section depends on the power of the installation, the length of the cable and the installation method. For a 4G4 mm² XVB cable:
Table of admissible currents according to installation method :
To validate the sizing of your cables and accurately calculate the voltage drop of your installation, consult our free calculator available in the Wattuneed toolbox.
The XVB 4G4 mm² cable must be carefully laid in accordance with good practice and the requirements of the RGIE :
Preparation and planning :
Installation techniques:
Connections and splicing :
For detailed wiring diagrams and examples of complete installations, see our page dedicated to photovoltaic installation diagrams.
The XVB 4G4 mm² cable complies with the requirements of the RGIE (Belgian General Regulations on Electrical Installations), which govern all electrical installations in Belgium.
Main conformities RGIE :
European and Belgian standards :
If you have any questions about the compliance of your installation or would like advice on how to implement it, please contact our technical support centre.
The XVB 4G4 mm² cable is suitable for the fixed connection of 4 to 6 kW three-phase inverters operating WITHOUT a neutral conductor. Here are some examples of compatible inverters:
⚠️ Essential check: Before using a 4G cable (without neutral conductor), ALWAYS consult the technical documentation for your UPS to confirm that it does indeed operate without a neutral conductor. If in doubt, use the XVB 5G4 cable (with neutral).
Inverters generally compatible with 4G cable (4-6 kW):
Inverters requiring a neutral (5G cable required) :
🔍Our recommendation: If in doubt about the need for the neutral conductor, contact our technical support BEFORE you order. We will help you determine whether the XVB 4G4 or 5G4 cable is suitable for your installation.
To help you choose the right section for your project, here is a comparison table:
How to choose
For any technical questions about sizing your cables, choosing between XVB 4G4 and 5G4, or RGIE compliance, consult our technical support centre or use our free calculation tools.
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