Retrofit cable in the Telecom Corridor.

The typical building is low-rise, wide and deep, with a service room at one end and a riser through the middle. Lab space adds a mechanical mezzanine, dedicated power and a grounding system that was designed to be quiet rather than merely safe, and all three mean more conductor in a low building than its footprint suggests.

Those buildings are now being repositioned rather than replaced, which means the cable comes out during renovation. A repositioning pulls riser feeder, panel feeders from old tenant switch rooms, and the branch wiring of a floor plate built for a density nobody uses now. The work is quiet, phased and constant, and it produces more copper than the demolition next door.

A riser replacement here is phased work. Floors stay occupied, pulls happen at night or over a weekend, and the old cable comes down in the lengths the conduit allows rather than in one continuous run from the service room to the top floor. The building keeps working while its wiring is replaced underneath the tenants.

That produces many short coils rather than a few long ones, and the list should say so. Grouping coils by floor and by conductor size gives a buyer something to measure; a single line reading riser cable does not, and it usually means a second visit.

• Note the floor each coil came from and the circuit it served.
• Separate feeder from branch conductor before weighing.
• Keep the old and new cable apart, since only one of them is surplus.
• Say whether the riser conduit was cleared or left with cable in it.

Telecom buildings carry grounding as a system rather than an afterthought: a grounding electrode conductor, a busbar in the equipment room, and a halo ground run around the room at rack height. All of it is bare copper, and all of it moves when a room is rebuilt for different equipment.

The conductor is straightforward to review and awkward to remove, because it is bolted or welded at every connection. A lot that arrives cut in short pieces is worth less than one pulled in the lengths between connections, and that is a removal decision rather than a valuation one.

Structured cabling is the largest volume and the smallest value in most of these strip-outs. Cat6, older categories and the coax left from early data networks arrive in boxes, on partial reels and in bundles cut at the ceiling when the trays came down. Boxes are the easiest thing in the building to move and the hardest to value.

It is still reviewed, and it is worth keeping separate from power conductor. Cat6 cable has its own construction and its own market, and a mixed pallet of data and power cable is sorted before anything is weighed, usually at the point of removal rather than at the dock. That one step decides whether a low-value pallet becomes three reviewable lines.