Blackburn FB2E12 FLEXIBLE BRAID 336KCMIL,12 INCHLONG

The FB2E12 is a flat, flexible tin-plated copper braid connector rated 336 kcmil, 12 inches long, with a two-hole terminal pad on each end. It bridges a bonding or grounding connection between two bolted points where some movement, vibration, or thermal expansion is expected, such as switchgear bus sections, transformer cases, generator frames, expansion joints, and equipment enclosures. Because the conductor is braided rather than solid, it flexes without fatiguing the connection.

It carries UL file E3060 and CSA file LR29625. For an inspector or a spec that calls for listed bonding jumpers, those are the file numbers to reference on the submittal.

The tin plating on the copper braid slows oxidation on the strands and at the bolted pad, which keeps contact resistance stable over time and makes the braid better suited to damp, outdoor, or industrial atmospheres than a bare copper braid. Tin plating also makes it compatible with aluminum bus and lugs, where bare copper in direct contact can set up galvanic corrosion.

The FB2E12 measures 12 inches overall. Size the jumper so the braid has slack between the two bolted pads rather than being pulled taut, since a braid under tension cannot absorb the movement it was installed to handle. Measure hole center to hole center across the gap in the equipment, then allow for that slack when choosing between braid lengths.

Country of origin on the FB2E12 flexible braid is the United States, which is what federal, state, and institutional jobs with domestic-content requirements normally ask you to document.

Use the braid where the two connection points move relative to each other. The FB2E12 is a flat flexible braid with pre-formed two-hole pads on each end, so it takes vibration, thermal growth, and door or panel movement without work-hardening the connection, and it bolts straight to a NEMA two-hole pad with no crimping or lug work on site. A stranded cable with crimped lugs is fine for a fixed run between two rigid points, and is generally easier to route over longer distances or around corners.

The braid is rated 336 kcmil, so it matches a bonding or grounding path sized at 336 kcmil. Confirm the bolt hole spacing and stud diameter on your equipment pads before ordering, since the ends are fixed two-hole terminals and cannot be re-drilled in the field without compromising the pad.

It is sold each, one braid per unit, under manufacturer part number FB2E12. Bonding runs usually need one per connection point, so count your jumpers off the equipment, not off a pack quantity.