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Product

instrumentation cable seriesRCC-E K1 / Class 1ELow-Noise Measuring (M)2.0 MGy + LOCA Qualified

74C068 SH M K1 EG NA Nuclear K1 Class 1E Measuring CableRCC-E K1 / Class 1E LOCA-qualified screened twisted-pair nuclear measuring cable

74C068 SH M K1 EG NA Nuclear K1 Class 1E Measuring Cable (150/250 V & 300/500 V) with tinned copper twisted pairs/triads, radiation-cross-linked K1 EPDM/PEEK-EPR insulation, individual + overall ('EG' Écran Général) tinned copper.

RCC-E K1 / IEEE 323
EG + Pair Screen EMC
IEEE 383 Halogen-Free
LOCA Steam & Spray
Order designation
74C068 SH M K1 EG NA 2P×1.0
Outer Ø ≈
12.8 mm
Weight ≈
215 kg/km
Conductor DC R
18.2 Ω/km
Min. bend radius
102 mm
All sizes (6)
Request a quoteDatasheetWhatsApp
Engineering reply in 2 business hoursCut-to-length export drumsEN 10204 3.1 certificate per drum
Qualification
RCC-E K1 / 1E
In-containment measuring
Voltage rating
150/250 V
300/500 V rated insulation
Conductor
0.50 to 1.5 mm²
Tinned copper twisted pairs
Radiation dose
≥ 2.0 MGy
60 yr + LOCA gamma dose
Mutual cap.
≤ 110 pF/m
Low signal distortion during DBA
LOCA peak
+170 °C / 5.5 ba
High IR retention in steam

Typical values for this cable type, based on RCC-E K1 / IEEE 323 / IEEE 383 / IEC 60780-323 — confirmed in the datasheet and quotation for your order.

Application fit

Is 74C068 SH M K1 EG NA right for your machine?

Engineered for safety-critical 4–20 mA pressure/level transmitters, Pt100 RTDs, containment radiation monitors and hydrogen recombiner sensors that must maintain microamp accuracy during a LOCA.

Fixed installation

Suitable

Routes through reactor building instrumentation trays and hermetically sealed containment penetrations.

Switchgear & control cabinet wiring

Suitable

Terminates in 1E protection-system racks (RPS / ESFAS) and post-accident monitoring (PAMS) panels.

Immersion & wet locations

Suitable

High insulation resistance (≥ 10 MΩ·km during LOCA) prevents shunt current errors on 4–20 mA loops.

Energy chain / drag chain

Not suitable

Fixed nuclear containment instrumentation cable; not for moving industrial cable carriers.

Use PUR-HF Drag-Chain Cable
Typical machinesReactor Protection System (RPS) LoopsPost-Accident Monitoring (PAMS / RG 1.97)Containment Pressure, Level & Flow (4–20 mA)4-Wire Pt100 RTD Temperature LoopsContainment Hydrogen & Radiation Sensors

Construction

Layer by layer

74C068 SH M K1 EG NA showing tinned copper twisted pairs/quads, high-IR K1 cross-linked EPDM insulation, individual pair foil/braid screens, overall tinned copper screen (EG), and SH K1 halogen-free outer sheath.

12345
Schematic, not to scale — generated from the layer data
#LayerMaterial & reference
1Stranded tinned annealed copper conductorsClass 2 (7-wire) or Class 5 tinned copper per IEC 60228 (0.50, 0.75, 0.93, 1.0, 1.5 mm²)Precision lay-length twisted pairs, triads or quads
2High-IR K1 cross-linked EPDM / PEEK-EPR dielectricUltra-high-resistivity nuclear K1 elastomer formulated to minimize leakage current at +170 °CPrevents > 0.5 % loop error on 4–20 mA transmitters during LOCA
3Individual pair screens (on multipair)Tinned copper tape/braid or Al/PET screen with tinned drain wire over each twisted pair≥ 85 dB pair-to-pair crosstalk attenuation
4Écran Général (EG) overall EMC screenOverall tinned copper wire braid (≥ 85 % coverage) + copper/PET tape barrierShields mV/mA loops against reactor coolant pump VFD noise
5SH Zero-Halogen K1 Cross-Linked Outer SheathRadiation- and LOCA-resistant Sans Halogène (SH) cross-linked elastomer (Grey or Blue)IEEE 383 & IEC 60332-3-24 flame retardant

74C068 SH M K1 EG NA (1 to 2 Pairs)

1P or 2P × 0.75 / 1.0 mm² sensor drop cable for containment pressure transmitters and RTDs

74C068 SH M K1 EG NA (4 to 19 Pairs)

Individually + overall screened multipair trunk cable between containment junction boxes and penetrations

Technical data

Ratings & operating limits

Typical values: Typical values for this cable type, based on RCC-E K1 / IEEE 323 / IEEE 383 / IEC 60780-323. Values for your order are confirmed in the datasheet and quotation.

Electrical

Rated voltage
150/250 V (300/500 V peak insulation rating)
Max. DC resistance @ 20 °C
36.7 Ω/km (0.50) · 24.8 Ω/km (0.75) · 18.2 Ω/km (1.0) · 12.2 Ω/km (1.5)
Insulation resistance @ 20 °C
≥ 5,000 MΩ·km (normal) · ≥ 10 MΩ·km (@ +170 °C LOCA)
Mutual capacitance
≤ 110 pF/m @ 1 kHz

Thermal

Continuous operating temp.
-25 °C to +90 °C (60-year design life)
LOCA / HELB accident peak
+170 °C to +210 °C saturated/superheated steam
Short-circuit temperature
+250 °C (5 s)

Mechanical

Min. bend radius
8 × OD (fixed) · 12 × OD (pulling)
Seismic qualification
IEEE 344 / IEC 60980 safe-shutdown earthquake (SSE)
Transfer impedance
≤ 30 mΩ/m up to 30 MHz (EG dual screen)

Resistance

Gamma & beta radiation
≥ 2.0 MGy (200 Mrad) cumulative dose
Boric acid & alkaline spray
30-day post-LOCA chemical spray & submergence
Flame & smoke (SH)
IEEE 383 / IEC 60332-3-24, IEC 60754-2 & IEC 61034-2

Reference standards

Nuclear qualification
RCC-E K1 · IEEE 323 · IEEE 383 · RG 1.97 · IEC 60780-323
Quality program
ISO 19443 / ASME NQA-1 / 10 CFR 50 App B
RoHS & REACH
2011/65/EU & EC 1907/2006 compliant

Identification

Code breakdown
SH=Halogen-Free · M=Mesure (Measuring) · K1=In-Containment · EG=Écran Général · NA=Unarmoured
Pair identification
Numbered Blue/White or Black/White twisted pairs
Customs tariff (HS)
8544.4993

Sizes

6 standard 74C068 SH M K1 EG NA measuring configurations

Dimensional, weight and resistance ratings for RCC-E K1 Class 1E screened instrumentation cables.

Dimensions & loop resistance
Order designationPairs × cross-sectionOuter Ø ≈
mm		Weight ≈
kg/km		Max. DC R
Ω/km		Min. bend R
mm		Enquiry
RCC-E K1 / Class 1E Screened Measuring Cables
74C068 SH M K1 EG NA 1P×0.751 Pair × 0.75 mm² (EG)8.49824.867
74C068 SH M K1 EG NA 1Q×0.751 Quad (4-wire RTD) × 0.75 mm²9.613524.877
74C068 SH M K1 EG NA 2P×1.02 Pairs × 1.0 mm² (Indiv + EG)12.821518.2102
74C068 SH M K1 EG NA 4P×1.04 Pairs × 1.0 mm² (Indiv + EG)15.633518.2125
74C068 SH M K1 EG NA 7P×1.07 Pairs × 1.0 mm² (Indiv + EG)18.849518.2150
74C068 SH M K1 EG NA 12P×1.012 Pairs × 1.0 mm² (Indiv + EG)23.676518.2189
  • Typical values for this cable type; dimensions and weights for your order are confirmed in the quotation.
  • 1-Quad (1Q) star-quad geometry provides balanced 4-wire Pt100 RTD resistance compensation.

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.

  1. ConductorClass 5 stranding
  2. Spark test100 % in-line
  3. Lay-upCores, earth, fillers
  4. SheathingInner, braid / screen, outer
  5. Electrical testsAC voltage, resistance
  6. DimensionsOD, wall thickness
  7. Inspection documents & dispatchDrum & dispatch
Testing & inspectionTest value / referenceFrequency
Routine tests
100 % 2.0 kV AC dielectric, IR (≥ 5 GΩ·km) & capacitance checkZero breakdown and verified pair capacitance/crosstalkEvery manufactured drum length
Sample tests
LOCA Insulation Resistance (IR) & leakage current accuracy testIR ≥ 10 MΩ·km at +170 °C steam so 4–20 mA error stays < 0.5 %K1 Type Qualification
2.0 MGy gamma irradiation + IEEE 383 vertical flame testPass post-LOCA mandrel bend and vertical tray burnK1 Type Qualification

Inspection certificate

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

Product approvals

RCC-E K1 & RG 1.97 CompliantIEEE Std 323 & IEEE Std 383ISO 19443 Nuclear QA

Company certificates

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

Marking & supply

Ordering & delivery

Sheath marking

TEBAOFLEX 74C068 SH M K1 EG NA RCC-E K1 CLASS 1E MEASURING
Delivery form
Fumigated wooden drums, steel reels or precision spools
Standard lengths
500 m · 1000 m (or custom cut/spooled lengths)
MOQ
100 m (standard) · 500 m (custom)
Lead time
2–4 weeks ex-works
Incoterms
EXW, FOB, CIF, DAP

Technical documents

Downloads

PDF74C068 SH M K1 EG NA Nuclear K1 Class 1E Measuring Cable – technical datasheet6 sizes · construction, technical data, approvalsXLSX74C068 SH M K1 EG NA spec data (Excel)All 6 sizes with dimensions and data, for your BOM or quotation
Revision
2026-10-20
Updated
2026-10-20

FAQ

Questions engineers ask first

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

Why is high Insulation Resistance (IR) during a +170 °C LOCA event far more critical for a Measuring ('M') cable than for a Control ('C') cable?
On a 4–20 mA transmitter loop powered at 24–48 V DC, any drop in insulation resistance at +170 °C creates a parallel shunt leakage current between the two conductors that directly corrupts the pressure or water-level reading in the main control room (US NRC RG 1.97). 74C068 SH M K1 EG NA uses a specialized high-resistivity K1 dielectric that maintains ≥ 10 MΩ·km even at peak LOCA steam temperature.
What does 'EG' signify in 74C068 SH M K1 EG NA?
'EG' stands for Écran Général (Overall General Screen) combined with individual electrostatic pair screens on multipair cables, providing both inter-pair crosstalk rejection and high-frequency EMC immunity.
Is a star-quad version available for 4-wire Class 1E Pt100 RTD sensors?
Yes. The 1Q×0.75 mm² and 1Q×1.0 mm² star-quad configurations twist all four RTD leads symmetrically inside one screen so lead-wire resistance and thermal gradients cancel out.
When should we switch from 74C068 SH M K1 EG NA to MI Triaxial Signal Cable?
Use 74C068 SH M K1 EG NA inside the containment building outside the reactor pressure vessel (RPV). For in-core or ex-core neutron flux detectors operating at +300 °C to +600 °C and > 10 MGy gamma/neutron fluence, use our MI Coaxial or MI Triaxial Signal Cable.

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74C068 SH M K1 EG NA Nuclear K1 Class 1E Measuring Cable

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