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Product

UL 493 UF-B UL 493 / NEC Article 340600 V−25…+60 °C (90 °C ampacity)

UL 493 Type UF-B 600 V Direct-Buried Underground CableUL 493 / NEC Article 340 · 600 V · -25 °C to +60 °C industrial UF-B construction

UL 493 Type UF-B 600 V Sunlight-Resistant Direct-Buried Underground Feeder Cable engineered to UL 493 / NEC Article 340 for 600 V service across -25 °C to +60 °C, featuring stranded copper conductor and pvc outer jacket with minimum bending radius 5 × OD.

Approved

Outdoor & humid

Ozone, UV & moisture

Water-resistant

Configuration

Order designation: UF-B 4G2.5
Outer Ø ≈: 10.8 mm
Total weight ≈: 186 kg/km
Min. bend R (fixed): 86 mm
Configuration: 4 × 2.5 mm²

All sizes (12)

Request a quote Datasheet WhatsApp info@tebaoflex.com

Engineering reply in 2 business hoursCut-to-length export drumsEN 10204 3.1 certificate per drum

Rated voltage: 600 V
Operating temp.: −25…+60 °C
Min. bend radius: 5 × OD
Conductor: copper conductor
Outer layer: PVC outer jacket
Standard: UL 493

Typical values for this cable type, based on UL 493 / NEC Article 340 — confirmed in the datasheet and quotation for your order.

Application fit

Is UF-B right for your machine?

Fixed installation

Suitable

Engineered and verified for fixed service in accordance with UL 493 / NEC Article 340.

Switchgear & control cabinet wiring

Suitable

Suitable for switchgear, control panels and equipment terminations within 5 × OD bend radius.

TBM gantry & advancing tunnel reel

With conditions

Use mechanical conduit or armoured protection where exposed to rock fall or crushing loads.

Motorised monospiral reel

Not suitable

Not designed for high-speed monospiral crane reeling; select a dedicated reeling cable.

NSHTOU Reeling Cable

Typical machinesBuilding & Fire SafetyCommercial & Residential Building DistributionData Centers & Public InfrastructureFire-Safe Evacuation & Riser ShaftsIndustrial Plant Balance-of-Plant Wiring

Construction

Layer by layer

Shown: UF-B (UL 493 / NEC Article 340) with stranded copper conductor, pvc core insulation and pvc outer jacket (4-layer construction).

Schematic, not to scale — generated from the layer data

#	Layer	Material & reference
1	Stranded copper conductor	High-conductivity copper conductor per UL 493 / NEC Article 340UL 493 / NEC Article 340
2	PVC core insulation	Extruded PVC dielectric (individual core / group layer)UL 493 / NEC Article 340
3	Nylon covering core insulation	Extruded Nylon covering dielectric (individual core / group layer)UL 493 / NEC Article 340
4	PVC outer jacket	Extruded PVC outer jacket protective layer (continuous layer)UL 493 / NEC Article 340

UF-B — Standard Execution

Built to UL 493 / NEC Article 340 with stranded copper conductor and pvc outer jacket

UF-B — Custom Cross-Sections

Full range of metric mm² and AWG/kcmil conductor sizes per UL 493 / NEC Article 340

UF-B — Export Drum Supply

Supplied with EN 10204 3.1 routine dielectric & conductor resistance test certificate

Technical data

Ratings & operating limits

Typical values: Typical values for this cable type, based on UL 493 / NEC Article 340. Values for your order are confirmed in the datasheet and quotation.

Electrical

Rated voltage / duty: 600 V (UL 493 / NEC Article 340)
Conductor construction: Stranded copper conductor — High-conductivity copper conductor per UL 493 / NEC Article 340
Primary insulation / dielectric: PVC core insulation — Extruded PVC dielectric (individual core / group layer)

Thermal

Continuous operating temperature: −25…+60 °C (90 °C ampacity) per UL 493 / NEC Article 340
Short-circuit / peak thermal limit: +160 °C to +250 °C (5 s adiabatic limit depending on dielectric class)
Minimum installation temperature: −5 °C (thermoplastic) / −25 °C (cross-linked or elastomer) / −40 °C (metallic)

Mechanical

Outer protection / covering: PVC outer jacket — Extruded PVC outer jacket protective layer (continuous layer)
Minimum bending radius: 5 × OD (installed / static routing)
Layer count & geometry: 4 concentric/structural layers verified by cross-section inspection

Resistance

Environmental & chemical durability: Engineered for industrial service in accordance with UL 493 / NEC Article 340
RoHS & REACH compliance: RoHS 2 (2011/65/EU + 2015/863) & REACH SVHC compliant

Reference standards

Governing product standard: UL 493 / NEC Article 340
Quality management & inspection: ISO 9001:2015 & EN 10204 3.1 factory routine inspection

Identification

Model designation: UF-B
Customs tariff (HS): 8544.49 / 8544.60 / 7614.10

Sizes

12 standard UF-B cable sizes

Manufactured to UL 493 / NEC Article 340 across standard single-core and multi-core cross-sections.

Dimensions, construction & weights
Order designation	Configuration	Outer Ø ≈ mm	Weight ≈ kg/km	Min. bend R fixed mm
UF-B Standard Production Schedule (600 V · −25…+60 °C (90 °C ampacity))
UF-B 3G1.5	3 × 1.5 mm²	8.4	105	68
UF-B 4G1.5	4 × 1.5 mm²	9.2	128	74
UF-B 5G1.5	5 × 1.5 mm²	10.1	156	81
UF-B 3G2.5	3 × 2.5 mm²	9.8	148	78
UF-B 4G2.5	4 × 2.5 mm²	10.8	186	86
UF-B 5G2.5	5 × 2.5 mm²	11.9	228	95
UF-B 4G4	4 × 4.0 mm²	12.6	268	101
UF-B 4G6	4 × 6.0 mm²	14.2	365	114
UF-B 4G10	4 × 10 mm²	17.5	580	140
UF-B 4G16	4 × 16 mm²	20.4	845	163
UF-B 4G25	4 × 25 mm²	24.8	1,290	198
UF-B 4G35	4 × 35 mm²	27.9	1,710	223

Typical values for this cable type; dimensions and weights for your order are confirmed in the quotation.
Single-core and multi-core sizes from 0.5 mm² up to 630 mm² (or AWG/kcmil) available per UL 493 / NEC Article 340.

Conductor resistance & current-carrying capacity
Cross-section	Max. DC R₂₀ Ω/km	Current in air A (30 °C) ≈	Voltage drop mV/A·m
1.5 mm² (AWG 16)	13.30	18	29.0
2.5 mm² (AWG 14)	7.98	26	17.5
4.0 mm² (AWG 12)	4.95	34	10.9
6.0 mm² (AWG 10)	3.30	44	7.3
10 mm² (AWG 8)	1.91	61	4.2
16 mm² (AWG 6)	1.21	82	2.7
25 mm² (AWG 4)	0.78	108	1.7
35 mm² (AWG 2)	0.55	135	1.2

Current ratings are for 3 loaded conductors at 30 °C ambient in free air/tray per IEC 60364-5-52 / NEC.

Quality & approvals

Testing & inspection

Routine tests on every production length, sample and type tests per batch — documented on an EN 10204 3.1 inspection certificate.

ConductorClass 5 stranding
Spark test100 % in-line
Lay-upCores, earth, fillers
SheathingInner, braid / screen, outer
Electrical testsAC voltage, resistance
DimensionsOD, wall thickness
Inspection documents & dispatchDrum & dispatch

Testing & inspection	Test value / reference	Frequency
Routine tests
Conductor DC resistance & dimensional verification (UL 493 / NEC Article 340)	DC resistance at 20 °C and geometry within UL 493 / NEC Article 340 class limits	Every manufactured drum / spool
Routine dielectric / spark / structural integrity test (UL 493 / NEC Article 340)	Zero breakdown or structural defect over full production length	Every manufactured drum / spool
Sample tests
Thermal aging, mechanical & material qualification (UL 493 / NEC Article 340)	Full compliance with UL 493 / NEC Article 340 across −25…+60 °C (90 °C ampacity)	Type qualification & periodic sample audit

Inspection certificate

Issued with every drum, listing the routine test results for that length.

Product approvals

UL 493 CompliantEN 10204 3.1 Routine Test CertificateCE, RoHS 2 (2011/65/EU) & REACH

Company certificates

ISO 9001ISO 14001ISO 45001VDE marks approvalUL / cULCE · LVD / EMC

Marking & supply

Ordering & delivery

Sheath marking

TEBAOFLEX UF-B <size> UL 493 600 V CE

Delivery form: Non-returnable fumigated wooden drums or precision DIN spools
Standard lengths: 500 m · 1000 m · 2000 m drums (custom cut lengths on request)
MOQ: 500 m (stock sizes) · 1000 m (custom production)
Lead time: 2–4 weeks ex-works
Incoterms: EXW, FCA, FOB, CIF, DAP

Technical documents

Downloads

PDFUL 493 Type UF-B 600 V Sunlight-Resistant Direct-Buried Underground – technical datasheet12 sizes · construction, technical data, approvals XLSXUF-B spec data (Excel)All 12 sizes with dimensions and data, for your BOM or quotation

Revision: 2026-10-21
Updated: 2026-10-21

FAQ

Questions engineers ask first

Not covered here? Send your drawing — an engineer replies within 2 business hours.

What governing standard and construction define UF-B (UL 493 Type UF-B 600 V Sunlight-Resistant Direct-Buried Underground Feeder Cable)?

UF-B (UL 493 Type UF-B 600 V Sunlight-Resistant Direct-Buried Underground Feeder Cable) is manufactured in accordance with UL 493 / NEC Article 340 for 600 V service over -25 °C to +60 °C (90 °C ampacity). Its 4-layer construction comprises stranded copper conductor, pvc core insulation, nylon covering core insulation, pvc outer jacket.

What is the minimum bending radius and installation temperature for UF-B?

The minimum installed bending radius for UF-B is 5 × OD across its continuous operating temperature range of -25 °C to +60 °C (90 °C ampacity), ensuring mechanical and dielectric stability without conductor or insulation strain.

How are the concentric layers of UF-B arranged from inside to outside?

From inside to outside, the construction sequence is: (01) Stranded copper conductor (High-conductivity copper conductor per UL 493 / NEC Article 340); (02) PVC core insulation (Extruded PVC dielectric (individual core / group layer)); (03) Nylon covering core insulation (Extruded Nylon covering dielectric (individual core / group layer)); (04) PVC outer jacket (Extruded PVC outer jacket protective layer (continuous layer)).

What factory test certificates are supplied with UF-B?

Every production drum or spool of UF-B undergoes routine conductor DC resistance, dimensional and dielectric/integrity testing per UL 493 / NEC Article 340, and is delivered with an EN 10204 3.1 factory test certificate.

Request a quote

Get an engineering quote for UF-B

Your selection and application details are copied into the enquiry form below.

01Selected sizes

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02Reel & motion

Add your operating conditions here to include them in your enquiry.

Reel typeDrum core diameter (mm)Cable length on drum (m)Travel speed (m/min)Max. accelerationCycles per hourLength and quantityAmbient temperatureExposure (outdoor, water, oil, abrasion)Destination countryEquipment and operating conditions

03Message for our engineers

UL 493 Type UF-B 600 V Direct-Buried Underground Cable

Selected sizes:


Reel & motion:
- Reel type: 
- Drum core diameter (mm): 
- Cable length on drum (m): 
- Travel speed (m/min): 
- Max. acceleration: 
- Cycles per hour: 
- Length and quantity: 
- Ambient temperature: 
- Exposure (outdoor, water, oil, abrasion): 
- Destination country: 
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