NSSHÖU & H07RN8-F Rubber Cable FAT Testing & PO Checklist

By TEBAOFLEX Jyen, Senior Cable Application Specialist at TEBAOFLEX. Reviewed by the TEBAOFLEX Engineering Review Board. Updated on October 23, 2026.

TL;DR: Writing "NSSHÖU 4G35" or "H07RN8-F 4G16" on a Purchase Order (PO) without binding elastomer and electrical acceptance clauses leaves procurement teams vulnerable to three common supplier shortcuts: under-cured rubber that splits on rock (failing IEC 60811-507 Hot-Set), single-layer extrusion omitting the GM1b inner sheath, and high-water-uptake EM2 sold as AD8 submersible cable. Enforce our 8-Point Engineering PO Checklist to mandate IEC 60228 Class 5 tinned copper, 200 °C Hot-Set elongation max. 60% (TEBAOFLEX Lab, 2026), 5GM5 tear resistance >= 15.0 N/mm (18.5 N/mm measured), 100 °C IRM 902 oil tensile retention >= 90%, and 2.5 kV / 3.0 kV / 6.0 kV AC water-tank hipot testing across NSSHÖU Heavy-Duty Rubber Cable, NSSHKCGEÖU Screened Cable, NSGAFÖU 1.8/3 kV Cable, and H07RN8-F Submersible Rubber Cable.

FAT at a Glance: Routine & Type Test FAT Thresholds Across Heavy-Duty Rubber Cables

This procurement and quality-assurance guide provides a ready-to-use 8-Point PO Specification Checklist and documents TEBAOFLEX's 2026 Factory Acceptance Test (FAT) batch data across our Heavy-Duty Rubber Cable Range.

FAT Test Category & Standard.

Flagship Product Pages.

• NSSHÖU / NSSHKCGEÖU (DIN VDE 0250-812).: NSSHÖU & NSSHKCGEÖU.
• NSGAFÖU / NSGAFCMÖU (DIN VDE 0250-602).: NSGAFÖU & NSGAFCMÖU.
• H07RN8-F / S1BC4N8-F (EN 50525-2-21 AD8).: H07RN8-F & S1BC4N8-F.

1. Conductor DC Resistance.

• NSSHÖU / NSSHKCGEÖU (DIN VDE 0250-812).: IEC 60228 Class 5 tinned Cu at 20 °C.
• NSGAFÖU / NSGAFCMÖU (DIN VDE 0250-602).: IEC 60228 Class 5 tinned Cu at 20 °C.
• H07RN8-F / S1BC4N8-F (EN 50525-2-21 AD8).: IEC 60228 Class 5 bare/tinned Cu at 20 °C.

2. Routine AC Water Hipot.

• NSSHÖU / NSSHKCGEÖU (DIN VDE 0250-812).: 3.0 kV AC for 5 min (0.6/1 kV).
• NSGAFÖU / NSGAFCMÖU (DIN VDE 0250-602).: 6.0 kV AC (1.8/3 kV) / 11.0 kV (3.6/6 kV).
• H07RN8-F / S1BC4N8-F (EN 50525-2-21 AD8).: 2.5 kV AC (H07RN8-F) / 3.0 kV (S1BC4N8-F).

3. Hot-Set Cure (200°C, 20 N/cm²).

• NSSHÖU / NSSHKCGEÖU (DIN VDE 0250-812).: max. 100% load / max. 25% set (58.4% / 9.2% FAT).
• NSGAFÖU / NSGAFCMÖU (DIN VDE 0250-602).: max. 100% load / max. 25% set (56.0% / 8.5% FAT).
• H07RN8-F / S1BC4N8-F (EN 50525-2-21 AD8).: max. 100% load / max. 25% set (61.2% / 10.4% FAT).

4. Sheath Tear (VDE 0472-613).

• NSSHÖU / NSSHKCGEÖU (DIN VDE 0250-812).: >= 15.0 N/mm (5GM5; 18.5 N/mm FAT).
• NSGAFÖU / NSGAFCMÖU (DIN VDE 0250-602).: >= 8.0 N/mm (5GM2; 10.2 N/mm FAT).
• H07RN8-F / S1BC4N8-F (EN 50525-2-21 AD8).: >= 7.5 N/mm (AD8 EM2; 10.4 N/mm FAT).

5. 100°C IRM 902 Oil Soak.

• NSSHÖU / NSSHKCGEÖU (DIN VDE 0250-812).: >= 70% tensile kept (91.2% FAT, 168 h).
• NSGAFÖU / NSGAFCMÖU (DIN VDE 0250-602).: >= 70% tensile kept (88.5% FAT, 168 h).
• H07RN8-F / S1BC4N8-F (EN 50525-2-21 AD8).: >= 65% tensile kept (86.0% FAT, 168 h).

6. Special Duty Verification.

• NSSHÖU / NSSHKCGEÖU (DIN VDE 0250-812).: CGE screen under 500 Ohm.m (NSSHKCGEÖU).
• NSGAFÖU / NSGAFCMÖU (DIN VDE 0250-602).: Short-circuit-proof wall (VDE 0100-520).
• H07RN8-F / S1BC4N8-F (EN 50525-2-21 AD8).: 70 °C water uptake max. 10 mg/cm² (6.4 mg/cm² FAT).

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Why Generic Mill Certificates Fail to Catch Counterfeit "Heavy-Duty" Rubber Cables

When an EPC contractor or mine maintenance department sources 0.6/1 kV NSSHÖU or AD8 H07RN8-F solely by lowest price per meter, unverified suppliers frequently cut production costs in three invisible ways. A basic continuity and room-temperature megger check will never detect these shortcuts:

1. Speeding Up the CV Steam Line (Under-Vulcanization): Crosslinking 3GI3 EPR and 5GM5 polychloroprene requires precise residence time at 18 bar steam pressure (205 °C) inside a catenary continuous vulcanization (CCV) tube. Running the line 35% faster leaves 40% of the polymer chains un-crosslinked. The cable passes a room-temperature 1,000 V megger test in the factory, but splits open under rock compression or melts during a motor starting surge.
2. Omitting the GM1b Inner Sheath on NSSHÖU: True DIN VDE 0250-812 NSSHÖU requires a two-layer jacket (GM1b inner sheath + 5GM5 outer sheath). Low-cost imitations extrude a single thick black or yellow jacket directly over the cores, reducing radial crush strength by 46% (from 24.6 kN down to 13.2 kN, TEBAOFLEX Lab, 2026).
3. Blending Recycled SBR or Calcium Carbonate Into 5GM5 / AD8 Jackets: Diluting polychloroprene with styrene-butadiene (SBR) or cheap chalk fillers causes the sheath to fail 100 °C IRM 902 oil immersion (retaining under 50% tensile strength) and absorb > 22 mg/cm² of water in submersible pump wells.

In our third-party witness inspections of 27 field-failed rubber cable lots submitted by mining and dewatering clients in 2025 and 2026, 85% (23 of 27 lots, TEBAOFLEX Lab, 2026) failed the IEC 60811-507 200 °C Hot-Set vulcanization test (stretching > 160% or snapping completely within 3 minutes). Requiring a signed Hot-Set and DIN VDE 0472-613 tear-strength test report prior to dispatch catches 100% of under-cured or thermoplastic-adulterated rubber cables before they leave the factory port.

Core Engineering Definitions for Rubber Cable FAT & Quality Control

To help procurement engineers write legally and technically binding inspection clauses into tender documents, we define four essential FAT verification terms below:

• IEC 60811-507 Hot-Set crosslink test is the mandatory factory acceptance test for thermoset rubber insulation (3GI3 / EI4) and sheathing (5GM5 / 5GM2 / EM2 / HM3). A stripped dumbbell sample is weighted at 20 N/cm² inside a 200 °C oven for 15 minutes to prove complete three-dimensional covalent vulcanization (elongation max. 100% under load, max. 25% permanent set).
• DIN VDE 0472-613 trouser tear test is the mechanical test (paired with IEC 60811-506) that measures the force required (in N/mm of thickness) to propagate a longitudinal razor slit through an elastomer outer sheath. DIN VDE 0250-812 mandates >= 15.0 N/mm for 5GM5 heavy-duty mining sheaths.
• Submerged water-tank AC dielectric test is the 100% routine factory hipot test (EN 50395 / DIN VDE 0472-502) where every completed cable reel is immersed in a heated water bath for >= 2 hours. It is then subjected to 2.5 kV AC (450/750 V), 3.0 kV AC (0.6/1 kV), or 6.0 kV AC (1.8/3 kV) for 5 minutes with zero breakdown.
• Optical profile projector wall check is the cross-sectional dimensional audit (IEC 60811-201 / -202) that measures minimum radial point thickness (tₘᵢₙ) and concentricity of the 3GI3 core insulation, GM1b inner bedding, and 5GM5 outer sheath under 20x digital magnification.

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Inside TEBAOFLEX's 4-Stage Factory Acceptance Test (FAT) Protocol

Every production drum of NSSHÖU, NSSHKCGEÖU, NSHXÖU, NSGAFÖU, and H07RN8-F must clear four laboratory gates before our quality department issues the serialized Drum Release Certificate:

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1. Gate A: Kelvin Bridge Conductor DC Resistance & Tinning Strip Check. We measure 20 °C temperature-corrected DC conductor resistance on 100% of drums using a four-terminal Kelvin micro-ohmmeter (verifying compliance with IEC 60228 Class 5 ceilings, e.g., max. 0.565 Ohm/km on 35 mm² tinned copper). For example, we also strip 100 mm of 3GI3 insulation to confirm bright, un-tarnished tin plating (ASTM B33 / IEC 60228).
2. Gate B: Optical Wall Thickness & GM1b + 5GM5 Dual-Extrusion Audit. A 2 mm wafer from both drum ends is scanned on our digital profile projector. For instance, this verifies that minimum insulation thickness never falls below 0.90 x nominal - 0.1 mm and that the GM1b inner sheath fully fills all core interstices.
3. Gate C: Elastomer Hot-Set (200 °C), Tear (VDE 0472-613), and Oil Soak (100 °C IRM 902). Dumbbell specimens cut from the actual drum sheath are tested for 200 °C Hot-Set (58.4% mean load elongation), trouser tear resistance (18.5 N/mm on 5GM5), and 168-hour 100 °C IRM 902 mineral oil tensile retention (91.2% on 5GM5, TEBAOFLEX Lab, 2026).
4. Gate D: Water-Tank AC Hipot & Submersible Autoclave Cycling. Every drum passes a 5-minute submerged AC hipot test (3.0 kV for NSSHÖU, 6.0 kV for NSGAFÖU, 2.5 kV for H07RN8-F). Meanwhile, AD8 submersible lots undergo 10 bar hydrostatic autoclave cycling and 70 °C gravimetric water-uptake checks (max. 6.4 mg/cm²).

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Tensile Retention After 168h IRM 902 Oil Soak at 100°C (%). horizontal bar data: Natural Rubber (NR/SBR) 38.5; Standard PVC (TM2) 52; Standard PCP (EM2) 76.4; Halogen-Free (HM3) 84.5; Heavy-Duty PCP (5GM5) 91.2.Source: TEBAOFLEX Chemical Qualification Lab 2026.

Source: TEBAOFLEX Chemical Qualification Lab, 2026.

Copy-and-Paste 8-Point Engineering Purchase Order (PO) Checklist

Copy the 8-Point PO Specification Table below directly into your Request for Quotation (RFQ) or Purchase Order appendix when procuring heavy-duty or submersible rubber cables. Column 3 shows the actual verified test values from our 2026 production lots (measured via our testing method and test setup in the TEBAOFLEX ISO 9001 Laboratory).

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PO Clause #.

1. Standard & Voltage Rating.

• Mandatory Technical Requirement to Write on Your PO.: DIN VDE 0250-812 (0.6/1 kV NSSHÖU), VDE 0250-602 (1.8/3 kV NSGAFÖU), or EN 50525-2-21 (AD8 H07RN8-F).
• TEBAOFLEX Verified 2026 Lot Result.: Full VDE / EN dimensional & voltage marking verified.
• Compliance Verdict.: PASS (100% Drum Check).

2. Conductor & Tinning (IEC 60228).

• Mandatory Technical Requirement to Write on Your PO.: Class 5 finely stranded tinned copper (NSSHÖU / NSGAFÖU) with 20 °C Kelvin bridge DC resistance report.
• TEBAOFLEX Verified 2026 Lot Result.: 97.8% to 99.1% of max R20 limit; bright Sn coating.
• Compliance Verdict.: PASS (Zero Sulfide).

3. Dual-Layer Jacket (NSSHÖU).

• Mandatory Technical Requirement to Write on Your PO.: Extruded GM1b inner sheath + 5GM5 outer sheath (single-layer extrusion strictly rejected).
• TEBAOFLEX Verified 2026 Lot Result.: Optical projector verified GM1b + 5GM5 dual wall.
• Compliance Verdict.: PASS (24.6 kN Crush).

4. Hot-Set Crosslink (IEC 60811-507).

• Mandatory Technical Requirement to Write on Your PO.: 200 °C, 20 N/cm², 15 min on 3GI3 & 5GM5: load elongation max. 100%, permanent set max. 25%.
• TEBAOFLEX Verified 2026 Lot Result.: 58.4% load elongation / 9.2% permanent set (5GM5).
• Compliance Verdict.: PASS (Fully Cured CV).

5. Sheath Tear (DIN VDE 0472-613).

• Mandatory Technical Requirement to Write on Your PO.: Outer sheath trouser tear resistance >= 15.0 N/mm (5GM5) or >= 10.0 N/mm (HM3).
• TEBAOFLEX Verified 2026 Lot Result.: 18.5 N/mm (5GM5 NSSHÖU) / 12.0 N/mm (HM3 NSHXÖU).
• Compliance Verdict.: PASS (+23% Margin).

6. Hot Oil Soak (IEC 60811-404).

• Mandatory Technical Requirement to Write on Your PO.: IRM 902 mineral oil at 100 °C x 168 h: tensile & elongation retention >= 70%.
• TEBAOFLEX Verified 2026 Lot Result.: 91.2% tensile kept / 88.6% elongation kept (5GM5).
• Compliance Verdict.: PASS (Oil Proof).

7. AD8 Water Uptake (H07RN8-F).

• Mandatory Technical Requirement to Write on Your PO.: IEC 60811-402 gravimetric soak (70 °C x 14 d) max. 10.0 mg/cm² + 10 bar autoclave R_iso report.
• TEBAOFLEX Verified 2026 Lot Result.: 6.4 mg/cm² (H07RN8-F) / 5.2 mg/cm² (S1BC4N8-F).
• Compliance Verdict.: PASS (AD8 100m Rated).

8. Routine Water-Tank Hipot.

• Mandatory Technical Requirement to Write on Your PO.: 100% drum immersion AC dielectric test (5 min): 2.5 kV (H07RN8-F), 3.0 kV (NSSHÖU), 6.0 kV (NSGAFÖU).
• TEBAOFLEX Verified 2026 Lot Result.: Zero breakdown across 100% of dispatched drums.
• Compliance Verdict.: PASS (Serialized Cert).

To review the complete structural, ampacity, and failure-analysis guides in this cluster, visit: * NSSHÖU, NSSHKCGEÖU & NSHXÖU Heavy-Duty Rubber Cable Guide * NSGAFÖU & NSGAFCMÖU 1.8/3 kV Short-Circuit-Proof Single-Core Cable Guide * NSSHÖU vs H07RN-F vs H07RN8-F Heavy-Duty Rubber Cables Compared * Preventing Oil Swelling, Ozone Cracking & Water Absorption in Rubber Cables

All lab tests follow IEC, DIN VDE, and ISO 9001 quality rules.

Key Takeaways & Frequently Asked Questions (FAQ)

Key Engineering Takeaways for Rubber Cable Procurement

1. Never Accept a Rubber Cable Shipment Without an IEC 60811-507 Hot-Set Report. It is the only fast laboratory proof that the 3GI3 insulation and 5GM5 jacket were fully crosslinked on the CV steam line.
2. Require Dual-Layer Cross-Section Photos Before Dispatch on NSSHÖU Orders. Confirming the GM1b inner bedding + 5GM5 outer jacket prevents single-sheath substitutions.
3. Mandate Gravimetric Water-Uptake (max. 10 mg/cm²) on All H07RN8-F & S1BC4N8-F POs. This guarantees true AD8 underwater longevity.

Frequently Asked Questions (FAQ)

Below are direct engineering answers grounded in DIN VDE and IEC test standards (2026).

How can a buyer verify that an NSSHÖU cable uses genuine 5GM5 polychloroprene instead of cheap SBR or thermoplastic rubber?

Require two laboratory test certificates on the Purchase Order: (1) the IEC 60811-507 Hot-Set test at 200 °C under 20 N/cm² load (a thermoplastic fake melts immediately, whereas genuine crosslinked 5GM5 elongates max. 60%), and (2) the DIN VDE 0472-613 tear-propagation test (>=15.0 N/mm minimum; TEBAOFLEX 2026 batches average 18.5 N/mm).

What routine AC voltage test is required before shipping NSSHÖU, NSGAFÖU, and H07RN8-F drums?

Every full production drum must pass a 5-minute AC water-tank dielectric withstand test: 2.5 kV AC for 450/750 V H07RN-F and H07RN8-F (EN 50525-2-21), 3.0 kV AC for 0.6/1 kV NSSHÖU and NSSHKCGEÖU (DIN VDE 0250-812), and 6.0 kV AC for 1.8/3 kV NSGAFÖU (DIN VDE 0250-602), plus 100% inline high-frequency spark testing.

Why must the PO explicitly specify Class 5 tinned copper for NSSHÖU and NSGAFÖU?

During high-temperature steam vulcanization, sulfur compounds in rubber react with bare copper to form brittle copper-sulfide scales that raise contact resistance at lugs. Specifying IEC 60228 Class 5 tinned copper prevents sulfur corrosion and ensures long-term solderability and crimp integrity in damp mines.

What FAT check confirms that NSSHKCGEÖU will trip a mine ground-fault relay reliably?

For screened NSSHKCGEÖU cables, the factory must verify both the volume resistivity of the extruded semiconductive rubber phase screen (under 500 Ohm.m per DIN VDE 0250-812) and the DC resistance balance of the concentric copper earth screen (K) and pilot monitoring core (ST).

Request a Sample FAT Dossier or a Custom Quote

Ready to source DIN VDE and EN 50525 rubber cables backed by complete pre-shipment laboratory evidence? Contact the TEBAOFLEX Engineering Team or message us on WhatsApp +86 185 9591 3361. We provide live video/photo FAT witnessing and batch-serialized certificates for NSSHÖU Heavy-Duty Rubber Cable, NSSHKCGEÖU Screened Mining Cable, NSGAFÖU 1.8/3 kV Cable, and H07RN8-F Submersible Rubber Cable.