EN 50288-7 Standard Explained: What Instrumentation Cable Buyers Must Know
- The Direct Answer: EN 50288-7 Defines Performance, Not Just Construction
People always ask: “What are the standard requirements for instrumentation cable?”
The simple answer: EN 50288-7 is the European standard that specifies the electrical, mechanical, flame retardancy, and temperature requirements for instrumentation and control cables used in industrial process control systems.
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What EN 50288-7 Covers |
What It Does NOT Cover |
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Electrical parameters (impedance, capacitance, attenuation, resistance) |
Specific insulation materials (calls out performance, not recipes) |
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Shielding effectiveness (screening requirements) |
Installation methods (see EN 60079-14 for hazardous areas) |
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Mechanical properties (bend radius, tensile, impact) |
Cable routing or tray fill calculations |
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Flame retardancy (IEC 60332-1, optionally IEC 60332-3) |
Conductor material (copper assumed, but gauge not fixed) |
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Temperature rating |
Voltage rating (covered by other standards) |
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CE marking compliance (harmonized standard) |
Hazardous area (Ex) certification (see IEC 60079-11/14) |
Why EN 50288-7 Matters to Buyers:
- CE marking – EN 50288-7 is a harmonized standard under the Low Voltage Directive (LVD) for the European market.
- Project specifications – Many engineering firms (EPCs) require EN 50288-7 compliance for industrial plants (refineries, chemical, power, pharmaceutical).
- Performance guarantee – Unlike generic “instrumentation cable,” EN 50288-7 provides quantified electrical parameters you can verify.
At Dingzun Cable, all our instrumentation cables are manufactured to EN 50288-7 requirements – with documented test reports for impedance, capacitance, attenuation, and flame retardancy. We support your CE marking and project compliance needs.
- Core Electrical Parameters: Impedance, Capacitance, Attenuation
EN 50288-7 specifies three critical electrical parameters that directly impact signal integrity.
Table 1: EN 50288-7 – Mandatory Electrical Specifications
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Parameter |
Symbol |
EN 50288-7 Requirement |
Why It Matters |
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Characteristic Impedance |
Z₀ |
100Ω, 120Ω, or 150Ω ±5Ω (tight tolerance) |
Mismatch causes signal reflection and data errors. 120Ω for RS485; 100-150Ω for analog |
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Capacitance (unbalance, pair-to-pair) |
Cu |
≤200 pF/100m |
High capacitance distorts analog signals and limits cable length |
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Attenuation (at 1 MHz) |
α |
≤20 dB/km (typical requirement) |
Higher attenuation = shorter maximum distance. Critical for digital communication |
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Conductor resistance |
R |
Depends on gauge (e.g., ≤73 Ω/km for 24 AWG) |
Affects voltage drop in 4-20mA loops. Thicker gauge = longer loops |
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Insulation resistance |
IR |
≥5,000 MΩ·km (typically ≥10,000 MΩ·km) |
Low IR causes signal leakage and crosstalk |
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Inductance |
L |
Typically ≤0.8 mH/km (implied by impedance formula) |
Affects high-frequency performance and signal rise time |
What ±5Ω Impedance Tolerance Means for Your System:
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Impedance Tolerance |
Reflection Coefficient |
Signal Quality |
EN 50288-7 Compliance |
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±5Ω (±4.2%) |
<2% reflection |
Excellent – full performance |
√ Compliant (premium) |
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±10Ω (±8.3%) |
~4% reflection |
Acceptable for short runs |
X Not compliant |
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±15Ω (±12.5%) |
~6% reflection |
Marginal – errors likely |
X Not compliant |
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Unspecified |
Unknown |
Risky – cannot guarantee |
X Not suitable |
(instrumentation cable for RS485: 120Ω±5Ω)
At Dingzun Cable, our EN 50288-7 compliant cables achieve 120Ω ±5Ω (≤4.2% tolerance) verified by 100% electrical testing – ensuring signal integrity for long-distance RS485 and analog loops.
- Mechanical and Environmental Requirements
EN 50288-7 also specifies mechanical robustness and environmental suitability.
Table 2: EN 50288-7 – Mechanical & Environmental Specifications
|
Parameter |
EN 50288-7 Requirement |
Typical Test Method |
Why It Matters |
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Minimum bend radius (fixed installation) |
7.5× outer diameter |
EN 60811-506 |
Prevents conductor fatigue and insulation damage during installation |
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Minimum bend radius (flexing) |
12-15× outer diameter (varies by design) |
EN 60811-506 |
Critical for cable tracks, robotics, moving machinery |
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Temperature rating (fixed) |
-30°C to +70°C (minimum) – higher optional |
EN 60811-501 |
Must survive plant ambient conditions |
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Temperature rating (flexing) |
-5°C to +50°C (minimum) – higher optional |
EN 60811-501 |
Cold flexibility for outdoor or refrigerated areas |
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Flame retardancy (single cable) |
IEC 60332-1-2 (mandatory) |
EN 60332-1-2 |
Prevents fire spread from a single cable fault |
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Flame retardancy (bundled cables) |
Optional – IEC 60332-3-24/25 (Cat C/B/A) |
EN 60332-3-24/25 |
Required for cable trays, tunnels, high-density installations |
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Oil resistance |
Optional – specified by customer (e.g., EN 60811-404) |
EN 60811-404 |
For machinery, automotive, or chemical plants |
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UV resistance |
Optional – specified for outdoor use |
ISO 4892-2 |
Prevents jacket cracking in sunlight |
Temperature Rating Upgrade Options (above EN 50288-7 minimum):
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Material Upgrade |
Temperature Range |
Application |
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PVC (standard) |
-30°C to +70°C |
General indoor, dry areas |
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XLPE |
-40°C to +90°C |
High temperature, wet locations |
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LSZH |
-30°C to +90°C |
Fire safety, enclosed spaces |
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PUR jacket |
-40°C to +90°C |
Oil, abrasion, outdoor |
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Silicone |
-60°C to +180°C |
High flexibility, extreme cold/heat |
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FEP/PFA |
-65°C to +200/260°C |
Extreme heat, chemical plants |
At Dingzun Cable, we manufacture EN 50288-7 compliant cables with upgraded temperature ratings, enhanced flame retardancy (IEC 60332-3 Cat C/B/A), and custom jacket materials (LSZH, PUR, FEP) to match your actual environment – not just the minimum standard.
(EN 50288-7 buyer’s compliance checklist)
- Shielding Requirements: Screening Performance
EN 50288-7 does not mandate a specific shield type (foil vs braid), but it does require documented shielding effectiveness.
Table 3: EN 50288-7 – Shielding & Screening Specifications
|
Parameter |
EN 50288-7 Requirement |
Typical Implementation |
When to Use |
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Individual pair screening (optional) |
Not mandatory, but if present, must meet transfer impedance limits |
Foil (100% coverage) + drain wire |
Critical analog signals (thermocouple, 4-20mA, RTD) to prevent crosstalk |
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Overall screening (recommended for multi-pair) |
Transfer impedance and coupling attenuation specified |
Braid (70-95%) or composite (foil + braid) |
Most industrial installations – reduces external EMI |
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Screening effectiveness (not numerically specified in basic standard) |
Must be declared by manufacturer |
Typically >70 dB (composite >90 dB) |
High-EMI environments (VFDs, motors, welders, power plants) |
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Drain wire |
Required for foil shields (to enable termination) |
Tinned copper, same gauge as conductor |
Simplifies grounding; essential for foil shields |
EN 50288-7 Shielding Guidance by Application:
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Application Environment |
Recommended Shielding |
Why |
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Low EMI (control room, office) |
Overall foil (minimal) |
Cost-effective, adequate |
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Moderate EMI (general factory) |
Overall braid (≥85% coverage) |
Durable, good low-frequency protection |
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High EMI (VFDs, motors, power lines) |
Composite (foil + braid) |
Broad-spectrum protection (>90 dB) |
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Critical analog signals (same cable with digital) |
Individual foil per pair + overall braid |
Prevents crosstalk between pairs |
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Flexible / dynamic applications (cable track) |
Overall braid only (more flexible than foil) |
Braid withstands repeated flexing |
At Dingzun Cable, all our EN 50288-7 multi-pair instrumentation cables include individual foil screening on each pair plus an overall tinned copper braid (≥85%) as standard – delivering superior crosstalk prevention and EMI protection. For extreme EMI, we offer composite (foil + braid) overall shields with documented >90 dB effectiveness.
- EN 50288-7 Compliance Checklist for Buyers
Use this checklist when procuring instrumentation cables to ensure EN 50288-7 compliance.
Table 4: EN 50288-7 Buyer’s Compliance Checklist
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Requirement |
What to Verify |
Typical Documentation |
Dingzun Cable Compliance |
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Characteristic impedance |
100Ω, 120Ω, or 150Ω ±5Ω |
Test report (impedance vs frequency) |
√ 120Ω ±5Ω (≤4.2% tolerance) |
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Capacitance unbalance |
≤200 pF/100m |
Test report |
√ ≤150 pF/100m |
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Attenuation |
≤20 dB/km @ 1 MHz |
Test report |
√ ≤18 dB/km @ 1 MHz |
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Conductor resistance |
Per gauge (e.g., ≤73 Ω/km for 24 AWG) |
Test report |
√ Verified per gauge |
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Insulation resistance |
≥5,000 MΩ·km |
Test report |
√ ≥10,000 MΩ·km |
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Flame retardancy (single) |
IEC 60332-1-2 |
Test certificate |
√ Compliant |
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Flame retardancy (bundled) |
IEC 60332-3-24/25 (Cat C/B/A) – if specified |
Test certificate |
√ Optional (Cat C, B, A available) |
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Temperature rating |
As specified (-30°C to +70°C minimum) |
Datasheet |
√ -40°C to +90°C (enhanced) |
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Bend radius |
7.5× OD (fixed) |
Datasheet |
√ Compliant |
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CE marking |
Declared by manufacturer |
Declaration of Conformity |
√ Provided |
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EN 50288-7 declared |
Manufacturer states compliance on datasheet |
Datasheet, quote |
√ Explicitly stated |
Red Flags (Non-Compliance Indicators):
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Red Flag |
Why It’s a Problem |
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Supplier cannot provide impedance or capacitance test reports |
Cannot verify EN 50288-7 compliance |
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Impedance tolerance stated as ±10Ω or ±15% |
Does not meet ±5Ω requirement; reflections likely |
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No capacitance unbalance value provided |
Cannot calculate safe distance for IS circuits |
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“Complies with EN 50288-7” but no test evidence |
Unsubstantiated claim – demand test reports |
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Only single-cable flame test, but installation is bundled |
May not meet fire safety code for cable trays |
At Dingzun Cable, we provide full EN 50288-7 test documentation with every shipment – including impedance, capacitance, attenuation, resistance, and flame test reports. Our datasheets explicitly state EN 50288-7 compliance. No claims without evidence.
- EN 50288-7 vs Other Instrumentation Cable Standards
Buyers often encounter multiple standards. Understanding the differences helps avoid confusion.
Table 5: EN 50288-7 vs Other Instrumentation Standards
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Standard |
Region |
Focus |
Key Differences from EN 50288-7 |
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EN 50288-7 |
Europe (CENELEC) |
Electrical + mechanical + flame for industrial control |
Baseline – harmonized for CE marking |
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IEC 60092-502 |
International |
Marine and offshore instrumentation |
Adds marine-specific requirements: salt spray, vibration, water resistance |
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BS5308 |
UK (legacy, still used) |
Oil & gas instrumentation |
Adds mechanical toughness (SWA armor), often requires hazardous area (blue) sheath |
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IEEE 1580 |
International |
Marine and offshore cables |
Similar to IEC 60092-502; North American focus |
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UL 13 / UL 2250 |
North America |
Power-limited circuit cables, instrumentation |
Different flame test hierarchy (VW-1, CMR, CMP); impedance not always specified |
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NEC / CEC |
North America |
Installation codes (not product standards) |
References UL standards for cable construction |
Which Standard Should You Specify?
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Project Location / Industry |
Primary Standard |
Secondary / Additional |
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Europe (general industrial) |
EN 50288-7 |
CE marking required |
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UK Oil & Gas |
BS5308 (often with EN 50288-7 electrical requirements) |
Hazardous area (ATEX/IECEx) |
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Offshore / Marine |
IEC 60092-502 or IEEE 1580 |
EN 50288-7 may be referenced for electricals |
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North America (general industrial) |
UL 13 / UL 2250 |
May also request EN 50288-7 for electrical parameters |
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International (EPC project – e.g., Shell, Total) |
EN 50288-7 or IEC 60092-502 (depending on sector) |
Often combined with project-specific requirements |
At Dingzun Cable, we manufacture instrumentation cables to EN 50288-7, BS5308, and IEC 60092-502 standards – with all test documentation. Our engineering team helps you interpret which standard your project actually requires.
- CE Marking: Why EN 50288-7 Matters for European Market
EN 50288-7 is a harmonized standard under the EU Low Voltage Directive (LVD) 2014/35/EU.
What Harmonized Means:
- Compliance with EN 50288-7 provides a presumption of conformity with the LVD.
- Products can bear the CE mark for electrical safety.
- Required for placing instrumentation cables on the European market.
CE Marking Requirements for Instrumentation Cables:
|
Requirement |
How EN 50288-7 Helps |
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Electrical safety (insulation, voltage withstand) |
EN 50288-7 includes insulation resistance and dielectric tests |
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Flame retardancy |
EN 50288-7 mandates IEC 60332-1-2 (single cable) |
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Manufacturer’s declaration |
EN 50288-7 compliance supports Technical File |
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Notified body involvement (not typically required for cables unless special construction) |
Not required – self-declaration based on EN 50288-7 |
For Buyers:
- If you are supplying to Europe or using European-sourced components, specify EN 50288-7 to ensure CE compliance.
- Request the Declaration of Conformity and test reports from your cable supplier.
At Dingzun Cable, all our EN 50288-7 compliant cables include CE marking and a Declaration of Conformity – supporting your regulatory compliance for European projects.
About Dingzun Cable: Your EN 50288-7 Instrumentation Cable Partner
With 20+ years of specialized manufacturing experience, Dingzun Cable is a trusted partner for global engineering firms, EPCs, and industrial end-users requiring EN 50288-7 compliant instrumentation cables with full test documentation. We combine deep standard expertise with extreme customizability to deliver cables that meet your project specification – not just the minimum.
(Dingzun Cable EN 50288-7 instrumentation cable)
Our EN 50288-7 Instrumentation Cable Capabilities:
|
Capability |
Dingzun Specification |
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Electrical compliance |
120Ω ±5Ω (≤4.2% tolerance), ≤150 pF/100m (capacitance unbalance), ≤18 dB/km attenuation |
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Impedance options |
100Ω, 120Ω, 150Ω – all ±5Ω |
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Pair count |
1 to 100+ pairs |
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Conductor gauge |
18 AWG to 24 AWG |
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Insulation |
PE (low capacitance, standard), XLPE (upgraded temp), PVC |
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Shielding |
Individual foil (per pair) + overall tinned copper braid (≥85%) – standard; composite optional |
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Flame retardancy |
IEC 60332-1-2 (standard); IEC 60332-3-24/25 Cat C/B/A (optional) |
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Jacket materials |
PVC, LSZH, PUR, (halogen-free, oil-resistant, UV-stabilized as required) |
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Temperature rating |
-40°C to +90°C (standard, enhanced over EN 50288-7 minimum) |
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Mechanical |
Bend radius 7.5× OD (fixed), tensile strength per EN 60811 |
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CE marking |
Provided with Declaration of Conformity |
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Test documentation |
Full test reports (impedance, capacitance, attenuation, resistance, flame) with every shipment |
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Certifications |
ISO 9001:2015, CE, RoHS, REACH |
Why Dingzun Cable for Your EN 50288-7 Instrumentation Cable Needs:
- True compliance – Not just “designed to meet” – we provide verified test reports
- Complete electrical documentation – Impedance, capacitance, attenuation, resistance reports included
- Enhanced performance – Tighter tolerance (120Ω ±5Ω), lower capacitance (≤150 pF/100m) than standard requires
- Extreme customizability – Pairs, gauge, shielding, jacket, armor – fully tailored
- Expert engineering team – Free consultation on EN 50288-7 interpretation and project requirements
- Direct professional communication – Fast quotes, technical datasheets, global shipping
Need an EN 50288-7 compliant instrumentation cable with full test documentation for your project?
[Contact our technical team today for a free consultation and custom quote].