Introduction to BFOU Fire Resistant Cables
When fire breaks out on a ship or offshore platform, the survival of crew and the integrity of the installation depend on the continued operation of emergency systems—fire pumps, emergency lighting, alarm systems, and shutdown controls. BFOU fire resistant cables are the specialized offshore cables engineered to maintain electrical circuit integrity during and after fire, ensuring that critical safety systems remain powered when they are needed most.
BFOU cables are part of the NEK 606 cable family for offshore installations, distinguished by their fire-resistant construction that goes beyond flame retardancy. While flame-retardant cables (like RFOU) prevent fire propagation, fire-resistant cables (BFOU) ensure the circuit continues to function for a specified duration under direct flame exposure at temperatures up to 950°C. TEBAOFLEX manufactures a comprehensive range of BFOU fire resistant cables certified to IEC 60331 for marine and offshore safety systems.
What Are BFOU Fire Resistant Cables?
The BFOU designation follows the NEK 606 offshore cable classification system:
- B — Fire resistant (IEC 60331 certified, maintains circuit integrity during fire)
- F — Flame retardant (IEC 60332-3 Category A, prevents fire spread)
- O — Oil resistant outer sheath
- U — UV and weather resistant for outdoor exposure
The critical difference between RFOU and BFOU is the B designation: BFOU cables include a mica tape layer over the conductor that provides fire-resistant insulation, allowing the circuit to continue functioning for 90+ minutes under direct flame at 950°C per IEC 60331. This makes BFOU cables mandatory for all emergency, safety, and life-saving circuits on offshore installations and vessels.
Construction and Fire-Resistant Technology
BFOU cables incorporate multiple layers of protection to achieve fire resistance:
Mica Tape Layer
The key fire-resistant element is one or two layers of phlogopite mica tape applied directly over the conductor, beneath the primary insulation. Mica is a mineral that maintains its insulating properties at temperatures above 1000°C. When the EPR insulation degrades during fire, the mica layer maintains electrical isolation, allowing the circuit to continue functioning.
EPR Insulation
Over the mica tape, EPR (ethylene propylene rubber) insulation provides the normal operating insulation rated for 90°C. The combination of mica + EPR creates a dual-layer system: EPR for normal operation, mica for emergency fire survival.
LSZH Outer Sheath
BFOU cables typically use LSZH (low smoke zero halogen) outer sheaths that produce minimal smoke and no corrosive halogen gases during fire. This is critical for enclosed platform areas and accommodation modules where smoke inhalation is a primary risk. CSP sheath options are available for exposed deck areas requiring additional oil resistance.
Armor and Screens
For mechanical protection during installation, BFOU cables may include galvanized steel wire armor (SWA) and copper tape or wire braid screens for electromagnetic compatibility in instrumentation and control circuits.
Technical Specifications
| Parameter | BFOU Power (0.6/1 kV) | BFOU Control (250 V) |
|---|---|---|
| Standard | NEK 606 / IEC 60331 | NEK 606 / IEC 60331 |
| Conductor | Tinned Cu, Class 2 or 5 | Tinned Cu, Class 5 |
| Fire Resistant Layer | Mica tape | Mica tape |
| Insulation | EPR | EPR / XLPE |
| Max Temperature | 90°C | 90°C |
| Fire Resistance | IEC 60331 (950°C, 90 min) | IEC 60331 (950°C, 90 min) |
| Flame Retardant | IEC 60332-3 Cat. A | IEC 60332-3 Cat. A |
| Smoke Emission | IEC 61034 (min 60% transmittance) | IEC 61034 |
| Halogen Content | IEC 60754-2 (zero halogen) | IEC 60754-2 |
| Outer Sheath | LSZH / CSP | LSZH |
IEC 60331 Fire Resistance Testing
The IEC 60331 standard defines the test for fire resistance of cables. The test procedure involves:
- Cable is mounted horizontally above a propane burner
- Flame temperature maintained at 950°C (+50°C) for the full test duration
- Rated voltage applied continuously during the fire test
- Minimum test duration: 90 minutes (IEC 60331-1 for 0.6/1 kV cables)
- Pass criteria: no breakdown, no conductor short circuit, fuse not blown
- Additional mechanical shock test (IEC 60331-31) applies water impact every 15 minutes
BFOU cables must pass this test to be certified for emergency circuit applications. View IEC 60331 type test certificates for TEBAOFLEX fire-resistant cables.
Marine and Offshore Applications
BFOU fire-resistant cables are mandatory for safety-critical circuits on vessels and offshore platforms:
Emergency Lighting
Escape route lighting, deck lighting, and accommodation emergency lighting must remain operational during fire to enable safe evacuation. BFOU cables ensure power supply to emergency lighting fixtures for the full 90-minute evacuation window.
Fire Pump Power Supply
Electric-driven fire pumps rely on BFOU cables to maintain power supply during fire conditions. Without fire-resistant cables, pump power would fail at the moment it is most critical.
Alarm and Detection Systems
Fire detection, gas detection, and alarm circuits use BFOU cables to ensure continuous monitoring during fire events. These systems trigger shutdown and evacuation procedures and must remain functional throughout.
Emergency Shutdown Systems
Process safety systems on offshore platforms require fire-resistant cables for ESD (emergency shutdown) circuits that must operate to isolate hydrocarbon sources during fire. See offshore safety applications.
Selection Guide for BFOU Cables
- Identify safety-critical circuits: Emergency lighting, fire pumps, alarms, ESD systems require fire-resistant cables
- Verify IEC 60331 compliance: Confirm 950°C / 90 min fire resistance test certificate
- Select voltage rating: LV (0.6/1 kV) for power, low voltage control for alarm and detection
- Choose sheath type: LSZH for enclosed areas, CSP for exposed deck areas with oil exposure
- Check flame retardancy: IEC 60332-3 Cat. A for bunched cable installations
- Verify smoke and halogen performance: IEC 61034 (low smoke) and IEC 60754 (zero halogen)
- Confirm classification approval: DNV, ABS, or LR type approval for vessel installations — view our certifications
- Request consultation: For complex safety system designs, contact TEBAOFLEX
Why Choose TEBAOFLEX BFOU Cables
TEBAOFLEX manufactures fire-resistant cables certified to the most demanding offshore safety standards:
- Full BFOU range: power, control, and instrumentation types per NEK 606
- IEC 60331 certified for 950°C / 90 minute fire resistance
- LSZH sheath compounds for low smoke and zero halogen performance
- DNV, ABS, and Lloyd’s Register type approval available
- Custom designs with integrated fire-resistant signal pairs for complex safety systems
Our custom manufacturing services support safety system engineering from design to commissioning. For IEC 60331 test certificates and technical consultation, contact TEBAOFLEX or browse our product catalog.
Request a Quote
Need BFOU fire resistant cables for your vessel or offshore platform? Our engineering team will respond within 24 hours with IEC 60331 certificates, specifications, and pricing. Submit your fire-resistant cable inquiry to TEBAOFLEX.
