Rockford Fosgate RFW8B 250 Foot Spool 8 AWG Frosted Black Wire
Rockford Fosgate RFW8B 8 AWG 250 Foot Frosted Black Wire Spool
For professional installers requiring bulk 8 AWG negative cable without compromise on conductor quality, the RFW8B delivers 250 feet of full-specification PC-OFC copper across 735 strands on a single spool.
Product Overview
The RFW8B is Rockford Fosgate's 250-foot bulk spool of 8 AWG negative insulated wire, designed for professional installers and high-volume car audio builds where pre-packaged ground cable lengths are impractical. Constructed from Pure Crystal-Oxygen Free Copper (PC-OFC) across 735 individual strands, it meets the full AWG specification at 8.36mm² cross-sectional area, ensuring the rated gauge is delivered in copper rather than compensated with thicker insulation. Conforming to CTA-2015 industry standards, the RFW8B guarantees the exact copper content required for the indicated gauge size across every metre of the spool, eliminating the undersized conductors common in non-compliant bulk cable products. The frosted outer jacket provides maximum flexibility for routing through tight installation paths despite the heavier gauge construction, while the BC-5W2 marine specification confirms suitability for both automotive and marine applications. 1-year warranty.
Features & Benefits
Pure Crystal-Oxygen Free Copper (PC-OFC): The conductor is made from oxygen-free copper with a pure crystal structure, minimising grain boundaries within the conductor that increase resistance. PC-OFC delivers lower resistance and better current-carrying performance than standard copper cable of equivalent gauge, maintaining consistent performance across the full 250-foot spool length.
Full AWG Specification at 8.36mm²: The RFW8B meets the full 8 AWG specification at 8.36mm² of copper cross-sectional area. CTA-2015 compliance confirms that the rated gauge is achieved through conductor content rather than inflated insulation thickness throughout the entire spool.
735-Strand Construction: The conductor is built from 735 individual copper strands, providing exceptional flexibility for an 8 AWG cable. This very high strand count makes the cable significantly easier to route through tight spaces and chassis runs than equivalent-gauge cables with fewer, thicker strands, while also improving fatigue resistance under sustained vibration.
250-Foot Bulk Spool: The 250-foot spool format provides sufficient cable for multiple vehicle installations or a single complex build from a single purchase, eliminating the need to source multiple pre-packaged lengths and reducing per-metre cost compared to pre-packaged options.
Frosted Outer Jacket for Maximum Flexibility: The frosted PVC outer jacket is formulated for maximum flexibility, allowing the cable to be routed through chassis runs and tight installation paths without kinking or cracking in cold conditions, even at the heavier 8 AWG gauge.
CTA-2015 Compliant: Rockford Fosgate cables conform to the CTA-2015 industry standard, which specifies the exact amount of copper required to qualify for a stated wire gauge. This standard protects against manufacturers substituting thicker insulation for copper conductor content.
BC-5W2 Marine Specification: The BC-5W2 rating confirms suitability for use in marine environments including boats and non-commercial watercraft, in addition to standard automotive applications.
Technical Specs
| Specification | Detail |
|---|---|
| SKU | RFW8B |
| Conductor Material | Pure Crystal-Oxygen Free Copper (PC-OFC) |
| AWG Rating | 8 AWG |
| Cross-Sectional Area | 8.36mm² |
| Number of Strands | 735 |
| Conductors | 1 |
| Application | Negative (Ground) |
| Length | 250 feet |
| Format | Bulk Spool |
| Jacket Colour | Frosted Black |
| Jacket Type | Frosted outer jacket |
| Compliance | CTA-2015, BC-5W2 Marine Specification |
| Warranty | 1 Year |
Goes Well With
The RFW8B is the bulk ground cable complement to Rockford Fosgate's 8 AWG power cable and amplifier wiring kits. It is well matched to amplifier installations specifying 8 AWG power and ground runs, including the PBR400X4D, R2-300X4, R2-200X2, and R2-250X1, all of which specify 4 AWG or 8 AWG power wire. The 250-foot spool format suits professional installers working across multiple vehicles or complex builds where ground runs to chassis earth points need to be cut to exact lengths. For complete amplifier power wiring, Rockford Fosgate's amplifier wiring kits and circuit breakers in the RFCB range are the recommended complement alongside this cable.
Frequently Asked Questions
What is the RFW8B used for, and why is it a single-conductor cable?
The RFW8B is a single-conductor negative (ground) cable, designed specifically for the ground run between the amplifier chassis and the vehicle's chassis earth point. Unlike speaker wire which requires two conductors for the positive and negative speaker connections, a ground cable only requires a single conductor run from the amplifier to the nearest suitable chassis earth point. The black jacket identifies it as a negative cable.
What is PC-OFC and why does it matter for a ground cable?
PC-OFC stands for Pure Crystal-Oxygen Free Copper. Standard copper wire contains oxygen and grain boundaries within the conductor's crystal structure that increase resistance. In a ground cable, resistance in the ground path limits the amplifier's ability to return current to the vehicle's electrical system efficiently, which can cause voltage instability and reduce amplifier performance. PC-OFC's lower resistance ensures the ground path is as clean and low-impedance as possible.
What does CTA-2015 compliance mean for a bulk ground cable spool?
CTA-2015 is an industry standard specifying the exact amount of copper conductor required to legitimately claim a specific wire gauge. Some manufacturers reduce copper content while increasing insulation thickness to reach the nominal diameter of a given gauge, resulting in cable that underperforms its stated rating. CTA-2015 compliance on the RFW8B confirms the full 8.36mm² of copper cross-section is present throughout every metre of the 250-foot spool, not just in sample lengths.
Why does the RFW8B have 735 strands?
A larger AWG gauge requires more total copper cross-section. To achieve the 8.36mm² required for 8 AWG while maintaining maximum flexibility, Rockford Fosgate uses 735 individual fine-gauge strands rather than fewer, thicker strands. The very high strand count distributes the copper content across more, thinner wires, which allows the completed cable to flex more easily despite its heavier gauge rating. This is particularly beneficial during installation when routing the cable through chassis and firewall locations.
What does the BC-5W2 marine specification mean for automotive use?
BC-5W2 is a marine-grade wiring specification indicating the cable is rated for use in boat and non-commercial marine environments where exposure to moisture, salt air, and vibration exceeds standard automotive conditions. For car audio use, BC-5W2 compliance means the cable is built to a higher standard of moisture and corrosion resistance than basic automotive ground wire, making it suitable for vehicles exposed to wet conditions and for marine audio installations alongside standard car audio applications.
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
Rockford Fosgate RFW8B 8 AWG 250 Foot Frosted Black Wire Spool
For professional installers requiring bulk 8 AWG negative cable without compromise on conductor quality, the RFW8B delivers 250 feet of full-specification PC-OFC copper across 735 strands on a single spool.
Product Overview
The RFW8B is Rockford Fosgate's 250-foot bulk spool of 8 AWG negative insulated wire, designed for professional installers and high-volume car audio builds where pre-packaged ground cable lengths are impractical. Constructed from Pure Crystal-Oxygen Free Copper (PC-OFC) across 735 individual strands, it meets the full AWG specification at 8.36mm² cross-sectional area, ensuring the rated gauge is delivered in copper rather than compensated with thicker insulation. Conforming to CTA-2015 industry standards, the RFW8B guarantees the exact copper content required for the indicated gauge size across every metre of the spool, eliminating the undersized conductors common in non-compliant bulk cable products. The frosted outer jacket provides maximum flexibility for routing through tight installation paths despite the heavier gauge construction, while the BC-5W2 marine specification confirms suitability for both automotive and marine applications. 1-year warranty.
Features & Benefits
Pure Crystal-Oxygen Free Copper (PC-OFC): The conductor is made from oxygen-free copper with a pure crystal structure, minimising grain boundaries within the conductor that increase resistance. PC-OFC delivers lower resistance and better current-carrying performance than standard copper cable of equivalent gauge, maintaining consistent performance across the full 250-foot spool length.
Full AWG Specification at 8.36mm²: The RFW8B meets the full 8 AWG specification at 8.36mm² of copper cross-sectional area. CTA-2015 compliance confirms that the rated gauge is achieved through conductor content rather than inflated insulation thickness throughout the entire spool.
735-Strand Construction: The conductor is built from 735 individual copper strands, providing exceptional flexibility for an 8 AWG cable. This very high strand count makes the cable significantly easier to route through tight spaces and chassis runs than equivalent-gauge cables with fewer, thicker strands, while also improving fatigue resistance under sustained vibration.
250-Foot Bulk Spool: The 250-foot spool format provides sufficient cable for multiple vehicle installations or a single complex build from a single purchase, eliminating the need to source multiple pre-packaged lengths and reducing per-metre cost compared to pre-packaged options.
Frosted Outer Jacket for Maximum Flexibility: The frosted PVC outer jacket is formulated for maximum flexibility, allowing the cable to be routed through chassis runs and tight installation paths without kinking or cracking in cold conditions, even at the heavier 8 AWG gauge.
CTA-2015 Compliant: Rockford Fosgate cables conform to the CTA-2015 industry standard, which specifies the exact amount of copper required to qualify for a stated wire gauge. This standard protects against manufacturers substituting thicker insulation for copper conductor content.
BC-5W2 Marine Specification: The BC-5W2 rating confirms suitability for use in marine environments including boats and non-commercial watercraft, in addition to standard automotive applications.
Technical Specs
| Specification | Detail |
|---|---|
| SKU | RFW8B |
| Conductor Material | Pure Crystal-Oxygen Free Copper (PC-OFC) |
| AWG Rating | 8 AWG |
| Cross-Sectional Area | 8.36mm² |
| Number of Strands | 735 |
| Conductors | 1 |
| Application | Negative (Ground) |
| Length | 250 feet |
| Format | Bulk Spool |
| Jacket Colour | Frosted Black |
| Jacket Type | Frosted outer jacket |
| Compliance | CTA-2015, BC-5W2 Marine Specification |
| Warranty | 1 Year |
Goes Well With
The RFW8B is the bulk ground cable complement to Rockford Fosgate's 8 AWG power cable and amplifier wiring kits. It is well matched to amplifier installations specifying 8 AWG power and ground runs, including the PBR400X4D, R2-300X4, R2-200X2, and R2-250X1, all of which specify 4 AWG or 8 AWG power wire. The 250-foot spool format suits professional installers working across multiple vehicles or complex builds where ground runs to chassis earth points need to be cut to exact lengths. For complete amplifier power wiring, Rockford Fosgate's amplifier wiring kits and circuit breakers in the RFCB range are the recommended complement alongside this cable.
Frequently Asked Questions
What is the RFW8B used for, and why is it a single-conductor cable?
The RFW8B is a single-conductor negative (ground) cable, designed specifically for the ground run between the amplifier chassis and the vehicle's chassis earth point. Unlike speaker wire which requires two conductors for the positive and negative speaker connections, a ground cable only requires a single conductor run from the amplifier to the nearest suitable chassis earth point. The black jacket identifies it as a negative cable.
What is PC-OFC and why does it matter for a ground cable?
PC-OFC stands for Pure Crystal-Oxygen Free Copper. Standard copper wire contains oxygen and grain boundaries within the conductor's crystal structure that increase resistance. In a ground cable, resistance in the ground path limits the amplifier's ability to return current to the vehicle's electrical system efficiently, which can cause voltage instability and reduce amplifier performance. PC-OFC's lower resistance ensures the ground path is as clean and low-impedance as possible.
What does CTA-2015 compliance mean for a bulk ground cable spool?
CTA-2015 is an industry standard specifying the exact amount of copper conductor required to legitimately claim a specific wire gauge. Some manufacturers reduce copper content while increasing insulation thickness to reach the nominal diameter of a given gauge, resulting in cable that underperforms its stated rating. CTA-2015 compliance on the RFW8B confirms the full 8.36mm² of copper cross-section is present throughout every metre of the 250-foot spool, not just in sample lengths.
Why does the RFW8B have 735 strands?
A larger AWG gauge requires more total copper cross-section. To achieve the 8.36mm² required for 8 AWG while maintaining maximum flexibility, Rockford Fosgate uses 735 individual fine-gauge strands rather than fewer, thicker strands. The very high strand count distributes the copper content across more, thinner wires, which allows the completed cable to flex more easily despite its heavier gauge rating. This is particularly beneficial during installation when routing the cable through chassis and firewall locations.
What does the BC-5W2 marine specification mean for automotive use?
BC-5W2 is a marine-grade wiring specification indicating the cable is rated for use in boat and non-commercial marine environments where exposure to moisture, salt air, and vibration exceeds standard automotive conditions. For car audio use, BC-5W2 compliance means the cable is built to a higher standard of moisture and corrosion resistance than basic automotive ground wire, making it suitable for vehicles exposed to wet conditions and for marine audio installations alongside standard car audio applications.
