We buy surplus copper busbar

Copper busbar comes out of switchgear teardowns, panel builders and busway replacements, and from the crews that strip out a service. Flat bar and formed bus from 1/8 in to 1/2 in thick and 1 in to 8 in wide, bare or tin plated, cut or in full lengths.

Bus is dense, easy to identify and easy to weigh, which makes it one of the simpler materials in a surplus program. The complication is fabricated bus: a run with bends, holes, insulators and bolted joints has to be assessed as an assembly before it is assessed as copper.

Thickness, width and the shape of the bar

Bus is specified by thickness and width, and those two numbers describe the bar completely. A quarter-inch by four-inch bar is a standard switchgear section. Half-inch bar appears in heavier equipment and in busway. Thin bar turns up in panelboards and control work.

Full lengths are the easiest to handle and the easiest to reuse. Cut pieces are read on length as well as section, because a two-foot offcut of large bar still has a use in a panel change while a six-inch piece usually does not.

Tin plating, paint and fabricated assemblies

Tin plating is put on bus to keep the joint surface clean and to reduce resistance at a bolted connection. Plated bus and bare bus are read differently, because the plating has to be dealt with before the copper is, and because plated bus is often the better material for reuse.

Paint is a different matter. Painted bus, insulated bus and bus with heat-shrink on it all need the covering removed, and that is handling rather than value. Fabricated runs with bends, holes, insulators and hardware are read as assemblies first, and stripped only if the assembly has no use.

Weighing bus against a calculated weight

A fabricated run has a theoretical weight that can be calculated from its section and length. The scale will give a different number, because bends, holes, welds and attached hardware all change it. Both numbers are useful and neither is the answer on its own.

We weigh what is in front of us and compare it with the calculation to see whether anything is missing from the description. That is how a bus lot gets checked. It is also why a seller should not cut up a fabricated run to make it stack better, since that removes the option of reuse.

Copper bus comes out of buildings whenever a service is replaced. Downtown Austin renovations strip out old switchgear, and the plant work in Taylor and the data halls along SH-130 replace it on a shorter cycle. Each teardown produces bar, formed bus and a pile of hardware.

Panel builders around Round Rock and San Marcos generate offcuts continuously, and those lots tend to be clean and sorted by section. We take both, from a single bar to a roll-off box of formed runs with insulators still bolted on.