When buyers compare N2XY vs NYY, they are usually deciding between two 0.6/1 kV copper power cables with different insulation materials. Adding U-1000 R2V cable to the comparison makes the decision more useful for international projects because U-1000 R2V is widely specified in France and French-influenced markets.
The short answer is:
- Choose NYY cable when the project specifies a German-style PVC/PVC fixed power cable and a 70°C conductor temperature rating is sufficient.
- Choose N2XY cable when the project follows German or VDE-based specifications and requires XLPE insulation, higher thermal capability, or improved short-circuit performance.
- Choose U-1000 R2V cable when the tender, consultant, or destination market requires a French-standard XLPE/PVC low-voltage cable.
- Do not assume that N2XY and U-1000 R2V are automatically interchangeable simply because both normally use copper conductors, XLPE insulation, and a PVC sheath.
The correct low voltage cable selection should be based on the required standard, installation method, current-carrying capacity, voltage drop, short-circuit duty, fire requirements, and project documentation—not only the cable name.
Quick Comparison: N2XY vs NYY vs U-1000 R2V
| Item | NYY Cable | N2XY Cable | U-1000 R2V Cable |
|---|---|---|---|
| Typical market system | German/VDE and related markets | German/VDE and related markets | France and French-influenced markets |
| Rated voltage | 0.6/1 kV | 0.6/1 kV | 0.6/1 kV |
| Conductor | Copper, normally Class 1 or Class 2 depending on size | Copper, normally Class 1 or Class 2 depending on size | Copper, with conductor construction depending on size and specification |
| Insulation | PVC | XLPE | XLPE |
| Outer sheath | PVC | PVC | PVC |
| Typical conductor temperature | Up to 70°C | Up to 90°C | Commonly up to 90°C, subject to the approved datasheet |
| Typical short-circuit conductor temperature | Up to 160°C for the permitted duration | Up to 250°C for the permitted duration | Up to 250°C for the permitted duration |
| Thermal performance | Standard | Higher | Higher |
| Common standard reference | DIN VDE 0276-603 / HD 603 | DIN VDE 0276-603 / HD 603 | NF C 32-321 |
| Common application | General fixed LV distribution | Higher-load fixed LV distribution | French-standard fixed LV distribution |
| Direct burial | Possible when permitted by the product data and local rules | Possible when permitted by the product data and local rules | Possible with appropriate installation protection |
| Armoured by default | No | No | No |
| LSZH by default | No | No | No |
The values above are typical category characteristics. Final ratings must always be taken from the exact manufacturer’s datasheet, project standard, and applicable installation code.
What Is NYY Cable?
NYY cable is a 0.6/1 kV fixed power cable that normally has:
- A solid or stranded copper conductor
- PVC conductor insulation
- Fillers or an inner covering where required
- A PVC outer sheath
In the German designation:
- N indicates a cable designed according to a recognized national standard system.
- The first Y identifies PVC insulation.
- The second Y identifies a PVC outer sheath.
NYY is commonly supplied as NYY-J or NYY-O:
- NYY-J includes a green/yellow protective conductor.
- NYY-O does not include a green/yellow protective conductor.
NYY is used in fixed electrical distribution systems, industrial facilities, utility connections, buildings, cable ducts, outdoor routes, and underground installations where the product specification and local installation rules permit.
Main Advantage of NYY Cable
The main advantage of NYY is its established, economical PVC/PVC construction. It can be a practical option when:
- The specification explicitly calls for NYY.
- The calculated cable load is within the relevant PVC cable ampacity table.
- The expected conductor temperature does not require an XLPE rating.
- The installation environment is compatible with the declared PVC sheath.
- Higher initial thermal performance does not justify changing to N2XY.
However, NYY should not be described as a temporary or low-quality cable. A correctly manufactured, sized, installed, and protected NYY cable can provide long-term service in suitable fixed installations.
What Is N2XY Cable?
N2XY cable is normally a copper conductor, XLPE-insulated, PVC-sheathed 0.6/1 kV power cable.
Its common construction includes:
- Class 1 or Class 2 copper conductor
- XLPE conductor insulation
- Fillers or an inner covering for multicore construction
- PVC outer sheath
In the designation:
- N refers to the national standard cable system.
- 2X identifies cross-linked polyethylene, or XLPE, insulation.
- Y identifies a PVC outer sheath.
Like NYY, N2XY may be supplied with suffixes:
- N2XY-J includes a green/yellow protective conductor.
- N2XY-O does not include a green/yellow protective conductor.
The important difference in N2XY vs NYY is therefore the insulation:
- NYY uses PVC insulation.
- N2XY uses XLPE insulation.
Main Advantages of N2XY Cable
XLPE insulation normally gives N2XY:
- A higher permissible conductor temperature
- Better short-circuit temperature capability
- Lower dielectric losses
- Better thermal stability under correctly designed operating conditions
- Potentially higher current-carrying capacity for the same nominal conductor size
This makes N2XY suitable for industrial distribution, main feeders, substations, commercial buildings, infrastructure projects, and circuits where higher thermal performance is required.
However, XLPE insulation does not automatically make the entire cable low-smoke, halogen-free, fire-resistant, mechanically armoured, or suitable for every outdoor environment.
What Is U-1000 R2V Cable?
U-1000 R2V cable is a French-designated 0.6/1 kV fixed power cable commonly manufactured with:
- A copper conductor
- XLPE insulation
- A PVC outer sheath
It is widely associated with NF C 32-321 and may also be manufactured with reference to IEC 60502-1 where specified.
U-1000 R2V is used for low-voltage power distribution in:
- Commercial buildings
- Industrial plants
- Infrastructure
- Utility connections
- Cable trays
- Ducts
- Outdoor fixed installations
- Underground routes with the required installation protection
The cable may be identified by constructions such as:
- 3G2.5, containing three conductors including a green/yellow protective conductor
- 4G16, containing four conductors including a green/yellow protective conductor
- 4×35, containing four conductors without a green/yellow protective conductor
KingForYou supplies U-1000 R2V, XV and RV low-voltage power cable for fixed power distribution and international project requirements.
N2XY vs NYY: What Is the Real Difference?
1. XLPE Insulation vs PVC Insulation
The most important difference is the insulation material.
NYY uses thermoplastic PVC insulation. N2XY uses thermoset XLPE insulation.
PVC softens as its temperature rises. XLPE has a cross-linked molecular structure that provides greater thermal stability. Consequently, the normal maximum conductor temperature is commonly:
- NYY: 70°C
- N2XY: 90°C
These are conductor temperatures, not ambient-temperature limits.
The cable may operate in an ambient environment much cooler than 70°C while its conductor approaches the permitted temperature because of load current, grouping, thermal insulation, soil conditions, and heat from nearby circuits.
2. Current-Carrying Capacity
An N2XY cable may have a higher permissible current rating than an NYY cable with the same conductor cross-section because XLPE allows a higher conductor temperature.
But buyers should not compare cable size using insulation temperature alone.
Actual ampacity depends on:
- Installation in air, conduit, duct, tray, or soil
- Ambient air temperature
- Soil temperature and thermal resistivity
- Burial depth
- Number of loaded cores
- Cable grouping
- Spacing between circuits
- Harmonic current
- Ventilation
- Terminal temperature limits
- Applicable national calculation method
A supplier should not promise a universal ampacity for “4×35 mm² N2XY,” for example, without first knowing the installation conditions.
For a more detailed explanation of standards, construction and testing, see our IEC 60502-1 cable guide.
3. Short-Circuit Performance
XLPE insulation normally permits a higher short-circuit conductor temperature than PVC insulation.
Typical limits are:
- NYY with PVC insulation: approximately 160°C
- N2XY with XLPE insulation: approximately 250°C
These values apply only for the permitted fault duration and must be verified using the exact standard and cable datasheet.
The cable still has to pass a short-circuit calculation based on:
- Prospective fault current
- Protection clearing time
- Initial conductor temperature
- Conductor material
- Conductor cross-section
- Permitted final temperature
A higher short-circuit temperature rating does not eliminate the need for protective-device coordination.
4. Voltage Drop
XLPE insulation does not by itself produce a major reduction in conductor voltage drop.
For copper cables of the same conductor size and length, voltage drop is mainly influenced by:
- Conductor resistance
- Conductor operating temperature
- Circuit length
- Load current
- Power factor
- Cable reactance
- Single-phase or three-phase configuration
N2XY may operate at a higher allowable conductor temperature, but copper resistance also rises with temperature. Therefore, “N2XY has less voltage drop because it uses XLPE” is not a reliable selection rule.
If voltage drop is excessive, the normal solution is to increase the conductor size, reduce the route length where possible, or redesign the circuit.
5. Installation and Handling
NYY can sometimes feel easier to handle because PVC insulation may be less rigid than XLPE. However, actual flexibility depends heavily on:
- Conductor class
- Number of cores
- Conductor size
- Cable diameter
- Filler construction
- Sheath compound
- Installation temperature
Both NYY and N2XY are primarily fixed-installation cables. They should not be selected for repeated movement, continuous flexing, festoon systems, cable chains, or portable equipment.
For routes with tight bends or demanding pulling conditions, a flexible RV-K low-voltage cable may be more suitable, subject to the project standard.
N2XY vs U-1000 R2V: Are They the Same Cable?
N2XY and U-1000 R2V often have the same basic material description:
Copper conductor / XLPE insulation / PVC sheath
That does not make them automatically identical.
The main distinction is the specification system:
- N2XY is commonly ordered under German or VDE-based requirements.
- U-1000 R2V is commonly ordered under French NF requirements.
The exact products may differ in:
- Applicable national standard
- Conductor construction
- Insulation thickness
- Sheath thickness
- Overall diameter
- Cable weight
- Core identification
- Available core and cross-section combinations
- Marking language and content
- Flame-performance declaration
- CPR classification
- Routine and type-test documentation
- Installation conditions stated by the manufacturer
A buyer should therefore avoid writing “N2XY/U-1000 R2V equivalent” in a purchase order without defining what “equivalent” means.
Can N2XY Replace U-1000 R2V?
Only if the project engineer, consultant, customer, or approving authority accepts the alternative.
Before substitution, compare:
- Required standard and edition
- Rated voltage
- Conductor material, class, and resistance
- Number of cores and protective conductor
- Insulation and sheath material
- Cable dimensions and gland compatibility
- Ampacity under the actual installation method
- Short-circuit performance
- Fire and CPR requirements
- Required certificates and test reports
A material match is not the same as contractual compliance.
NYY vs U-1000 R2V
The main difference between NYY and U-1000 R2V is again the conductor insulation:
- NYY normally uses PVC insulation.
- U-1000 R2V normally uses XLPE insulation.
U-1000 R2V therefore belongs to the same broad XLPE PVC cable category as N2XY, while NYY is normally a PVC/PVC cable.
For a French-standard project, U-1000 R2V is generally the more appropriate choice. For a German/VDE specification, NYY or N2XY should be selected according to the required insulation and thermal performance.
The cable name should follow the tender or approved technical specification unless a formal alternative is accepted.
Are These Cables Suitable for Direct Burial?
NYY, N2XY, and U-1000 R2V are commonly available for underground fixed installation. However, “suitable for direct burial” does not mean the cable can be placed in any soil without design precautions.
The installation must consider:
- Local electrical and civil regulations
- Required burial depth
- Sand bedding or selected backfill
- Cable warning tape or protective tiles
- Soil thermal resistivity
- Drainage and standing water
- Chemical contamination
- Rodent risk
- Vehicle loading
- Excavation risk
- Cable spacing
- Pulling tension
- Minimum bending radius
These cables are generally unarmoured. Where there is significant mechanical impact, crushing, or excavation risk, the designer may require:
- Protective conduit
- Concrete protection
- Cable tiles
- Steel-wire or steel-tape armoured cable
- Another mechanically protected construction
Direct burial capability should never be confused with armour.
For aluminium conductors and mechanically protected French-style cable options, see our comparison of U-1000 AR2V vs U-1000 ARVFV cable.
Are N2XY and U-1000 R2V Low-Smoke Halogen-Free?
No—not in their standard forms.
Although N2XY and U-1000 R2V use XLPE insulation, they normally have a PVC outer sheath. PVC contains halogens and can produce dense, corrosive smoke during combustion.
Therefore:
- XLPE insulation does not make the complete cable LSZH.
- Flame-retardant does not mean fire-resistant.
- Passing a vertical flame test does not prove low smoke.
- A CPR class does not automatically mean the cable is halogen-free.
- A black outer sheath does not prove UV resistance or fire performance.
Projects involving hospitals, airports, underground stations, tunnels, data centers, schools, high-rise escape routes, and other densely occupied buildings may require an LSZH or enhanced fire-performance cable instead.
The required smoke, acidity, flame spread, heat release, circuit integrity, and CPR classification should be written separately in the specification.
How to Select the Right LV Power Cable
Step 1: Follow the Project’s Standard System
Start with the tender, drawing, cable schedule, or local market requirement.
Choose:
- NYY or N2XY for German/VDE-based specifications
- U-1000 R2V for French NF-based specifications
- An IEC 60502-1 construction when the project is written directly around IEC requirements
Do not change the designation only because another cable appears technically similar.
Step 2: Confirm the System Voltage
Check both:
- U₀: voltage between conductor and earth
- U: voltage between conductors
NYY, N2XY, and U-1000 R2V are commonly rated 0.6/1 kV, but the final cable marking and datasheet must match the required system.
Step 3: Calculate Current-Carrying Capacity
Provide the supplier or cable engineer with:
- Design current
- Protective-device rating
- Installation method
- Ambient temperature
- Soil temperature and thermal resistivity
- Burial depth
- Number of grouped circuits
- Number of loaded cores
- Required derating factors
Do not select a cable using a generic ampacity chart from an unknown installation condition.
Step 4: Check Voltage Drop
Calculate voltage drop at both normal and starting conditions where relevant.
Motor circuits may require separate checks for:
- Full-load current
- Starting current
- Starting duration
- Permitted voltage dip
- Starting method
Long routes frequently require a larger conductor because of voltage drop even when the smaller conductor passes the ampacity calculation.
Step 5: Check Short-Circuit Withstand
Verify that the conductor can withstand the expected fault current until the protective device operates.
XLPE-insulated N2XY and U-1000 R2V often provide more short-circuit thermal margin than PVC-insulated NYY, but the calculation remains mandatory.
Step 6: Review the Installation Environment
Confirm:
- Indoor or outdoor installation
- UV exposure
- Direct burial or conduit
- Water exposure
- Oil or chemical exposure
- Rodent or termite risk
- Mechanical impact
- Minimum installation temperature
- Required bending radius
- Pulling tension
- Fire and smoke requirements
If the environment is not covered by the standard product declaration, request a modified sheath or another cable type.
Step 7: Confirm Compliance Documents
Depending on the destination market and contract, request:
- Technical datasheet
- Applicable standard and edition
- Conductor resistance test
- Voltage test results
- Dimensional inspection report
- Insulation and sheath thickness report
- Routine test report
- Type-test evidence where required
- Declaration of Performance for applicable EU construction use
- CPR classification
- CE-related documentation where applicable
- RoHS or REACH documentation if specified
- Drum list and packing details
- Certificate of origin or inspection certificate
The cable description on a quotation should match the description on the datasheet, test report, drum label, and cable marking.
Selection by Application
| Project condition | Recommended direction |
|---|---|
| German/VDE project with normal thermal demand | NYY may be suitable |
| German/VDE industrial feeder with higher thermal demand | N2XY |
| French commercial or industrial project | U-1000 R2V |
| High ambient temperature or grouped circuits | Calculate N2XY or U-1000 R2V using applicable derating factors |
| Budget-focused standard fixed distribution | Compare compliant NYY and XLPE alternatives on total installed cost |
| Public building requiring low smoke and low acidity | Do not use the standard versions without confirming fire requirements |
| Route with repeated movement | Use a cable designed for flexible or dynamic service |
| Direct burial with high mechanical risk | Use armour or an approved protective system |
| Long feeder with voltage-drop limitations | Increase conductor size based on calculation |
| French project requiring aluminium conductor | Consider U-1000 AR2V or an approved alternative |
How to Write a Clear Purchase Specification
A cable inquiry should contain more than “N2XY 4×35” or “R2V cable.”
A better specification would be:
U-1000 R2V, 0.6/1 kV, 4G35 mm², copper conductor, Class 2, XLPE insulation, PVC outer sheath, manufactured to NF C 32-321, IEC 60502-1 where contractually required, specified CPR class, black sheath, meter marking, required drum length, routine test report and packing list.
For N2XY, include:
- N2XY-J or N2XY-O
- Rated voltage
- Number of cores
- Conductor cross-section
- Copper conductor class
- DIN VDE/HD/IEC reference required by the contract
- Sheath colour
- CPR requirement
- Drum length
- Cable marking
- Required test documentation
For NYY, also confirm whether the cable must be:
- NYY-J or NYY-O
- Single-core or multicore
- Round or sector-shaped conductor
- Solid or stranded conductor
- Installed in air, duct, or soil
- UV resistant
- Supplied with a specific CPR classification
Clear specifications reduce quotation differences and prevent suppliers from comparing products with different conductor weights, sheath thicknesses, standards, or fire performance.
Buyer Checks Before Placing a Bulk Order
1. Verify Conductor Material and Resistance
Confirm that the conductor is copper and that its maximum DC resistance complies with the specified conductor standard and class.
Conductor resistance is more useful than conductor weight alone because it directly relates to electrical compliance.
2. Confirm Insulation Material
Do not rely only on the cable name. The datasheet should clearly identify:
- PVC insulation for NYY
- XLPE insulation for N2XY
- XLPE insulation for U-1000 R2V
Where necessary, ask how the manufacturer controls compound selection and production traceability.
3. Check Dimensions
Confirm:
- Insulation thickness
- Outer sheath thickness
- Overall diameter
- Cable weight
- Conductor diameter or shape
Overall diameter affects glands, conduits, tray loading, bending space, drum size, and installation cost.
4. Inspect Cable Marking
The marking should contain the required combination of:
- Manufacturer or brand
- Cable designation
- Rated voltage
- Number of cores and conductor size
- Standard
- Meter marking
- Production traceability
- CPR or other required information
For more details, read our electrical cable jacket markings guide.
5. Compare Documents With the Actual Cable
The cable marking, drum label, packing list, datasheet, and test report should all identify the same product.
Pay particular attention to:
- Core count
- Protective conductor
- Cross-section
- Standard
- Production batch
- Drum length
- Gross and net weight
6. Approve a Sample When Necessary
For custom marking, unusual construction, project-specific colours, or large export orders, buyers may approve a pre-production sample before bulk manufacturing.
The sample approval should not replace routine testing of the final production batch.
Common Selection Mistakes
Choosing Only by Price per Meter
A lower price may reflect differences in:
- Copper conductor resistance
- Insulation thickness
- Sheath thickness
- Cable diameter
- Applicable standard
- Test scope
- CPR classification
- Packing length
- Documentation
Compare quotations line by line before comparing the final price.
Treating N2XY and U-1000 R2V as Automatically Interchangeable
Their material descriptions may be similar, but their standards, dimensions, markings, and approvals can differ.
Assuming XLPE Means LSZH
N2XY and U-1000 R2V normally retain a PVC sheath. They are not standard LSZH cables.
Selecting Size From Load Current Alone
Cable sizing must also consider voltage drop, short-circuit duty, installation derating, protective devices, and future loading.
Ignoring the Protective Conductor
NYY-J and N2XY-J contain a green/yellow conductor, while the O versions do not. For French-style markings, “G” usually indicates a green/yellow conductor, while “x” does not.
Assuming Every Black Cable Is UV Resistant
Outdoor suitability must be declared by the manufacturer. Colour alone is not sufficient evidence.
Frequently Asked Questions
Is N2XY better than NYY?
N2XY provides higher thermal and short-circuit temperature capability because it uses XLPE insulation. However, NYY may still be the correct and more economical cable when the project specifies PVC insulation and the calculated operating conditions are within its limits.
Are N2XY and U-1000 R2V equivalent?
They often share a copper/XLPE/PVC construction, but they belong to different designation and national-standard systems. They should only be treated as alternatives after technical and contractual review.
Can NYY cable be buried underground?
Many NYY products are designed for underground fixed installation. The cable datasheet, local installation code, burial method, soil conditions, and required mechanical protection must still be checked.
Can U-1000 R2V be installed outdoors?
It is commonly used outdoors when the exact product has the required weather and UV characteristics. Confirm this from the manufacturer’s datasheet.
Is N2XY an armoured cable?
No. Standard N2XY is normally an unarmoured copper/XLPE/PVC cable. Mechanical protection must be provided separately when required.
Is U-1000 R2V fire-resistant?
Standard U-1000 R2V may have declared flame-performance characteristics, but it should not be described as a fire-resistant circuit-integrity cable unless it has been tested and certified for that function.
Does N2XY have lower voltage drop than NYY?
Not automatically. For the same copper conductor size, route and load, conductor resistance and operating temperature dominate voltage drop. XLPE insulation alone does not create a major reduction in voltage drop.
Which cable is more flexible?
NYY may sometimes be easier to handle than N2XY because of its PVC insulation, but both are fixed-installation cables. Actual flexibility depends on conductor class, size, core count and cable construction.
How do I choose the correct conductor size?
Calculate ampacity, voltage drop, short-circuit withstand, derating factors and protective-device coordination using the actual installation conditions and applicable national rules.
Final Recommendation
The best cable is not simply the one with the highest temperature rating.
Choose NYY cable when the project requires a German/VDE-style PVC/PVC fixed power cable and the 70°C insulation system meets the electrical and installation calculations.
Choose N2XY cable when a German or VDE-based project requires copper conductors, XLPE insulation, higher thermal capability and stronger short-circuit performance.
Choose U-1000 R2V cable when the project follows French NF specifications or specifically requires the U-1000 R2V designation.
Most importantly, do not approve substitutions based only on the words “copper, XLPE and PVC.” Compare the standard, conductor construction, dimensions, ampacity, fire declaration, cable marking and documentation before ordering.
KingForYou supplies low-voltage power cables for German, French and IEC-based projects. To receive an accurate recommendation, send us the required standard, cable size, core configuration, installation method, route length, load current, destination market and required documents through our contact page.
