Blackburn FBS2H110A1-12 FLEX BRAID 2 9/16H 3/8X1-1/2X 12 IN

It's a flat, flexible tin-plated copper braid with a two-hole terminal pad at each end, used to make a bonding or grounding jumper between two pieces of equipment that need to move, vibrate, or expand relative to each other. Typical uses are switchgear bus jumpers, transformer and enclosure bonding, and any connection where a rigid bar would fatigue. The braid itself is 12 inches long.

Two-hole pads, with the pad drilling described as 3/8 by 1-1/2 inches, so it takes 3/8 inch hardware on 1-1/2 inch centers. That is the standard NEMA two-hole pattern for 3/8 inch bolts, so it lands on equipment pads drilled the same way. Bolts, nuts and washers are not part of the braid itself.

The conductor is tin-plated copper. The tin plating is what lets it land on aluminum bus or aluminum enclosure pads without bare copper-to-aluminum contact, and it slows oxidation on the pad faces in damp or outdoor switchgear. Use an appropriate joint compound and torque to the equipment manufacturer's figure.

Use the braid wherever the two ends move. Switch operation, thermal expansion on a long bus run, transformer vibration, or a hinged panel all work-harden a rigid bar until it cracks at the bolt hole. A flat braid absorbs that motion and keeps the bonding path intact. Where both pads are fixed and rigid, a bar or bolted bus link is simpler. The FBS2H110A1-12 is the flexible option, 12 inches long with two-hole pads at each end.

The 12 inch figure is the braid length, so plan on the pad-to-pad opening being shorter than that. A flexible jumper only does its job with a deliberate loop or bow in it: pull one straight and taut between two pads and you've rebuilt a rigid link that will fatigue. Measure your opening, then leave enough slack for the full travel of whatever is moving.

Sold each, as one complete braid with the pads already formed on both ends. If you are jumpering three phases you need three, and bonding jumpers on both ends of a run double that. Order the bolts, belleville washers and nuts separately.

Flat. The conductor shape is a flat woven braid rather than a round stranded cable, which is why it flexes in one plane and packs into tight bus spacing without ballooning. If your application needs bending in every direction, a round flexible cable jumper suits better; for bus-to-bus and switch connections, flat braid is the usual form.