Blackburn SWB070A4304 FXBRAID TNCU700A 2H 9/16 7/16 304MM

The SWB070A4304 is a two-hole braid, one pad drilled 9/16 inch and the other 7/16 inch. That means one end lands on 1/2 inch hardware and the other on 3/8 inch hardware, so check which end goes to your bus pad and which to the equipment lug before you drill or order washers.

No. Both ends of the SWB070A4304 are two-hole pads, one at 9/16 and one at 7/16, so each landing point needs a matching two-hole drilling on standard NEMA spacing. A single-bolt pad needs a one-hole braid instead, otherwise the second hole has nothing to pick up and the pad will rotate under fault current.

A flat flexible braid like this one is the link you put between two rigid connection points that move relative to each other, thermal expansion on a bus run, vibration from a transformer or generator, or a hinged panel or door. Solid bar transmits that movement into the joint and eventually cracks it; the braid absorbs it while still carrying current. The flat shape also bolts flush to a bus pad, which round cable will not do without a lug.

It is tin-plated copper. The tin plating slows oxidation on the strands and on the bolted pad faces, which is why tinned braid is the usual choice for damp, outdoor, coastal, or industrial atmospheres and for joints to aluminum bus. Bare copper braid works fine in a clean dry indoor switchroom but dulls and builds oxide at the contact surface over time.

The TNCU700A in the description designates a tin-plated copper braid in the 700 amp size. Match that to the ampacity of the bus or equipment terminal you are bridging, the braid should be sized at or above the circuit it carries.

Sold each. One braid per order, so if you are jumping several phases plus a neutral, order a piece per connection point.

Country of origin on the SWB070A4304 braid is the United States, which is what a government, utility, or federally funded project needs on the submittal for domestic sourcing preferences.