Collection systems and balance-of-plant gear get the least attention in utility-scale procurement, but they represent 20–30% of total project BoS spend. They're also where project-surplus inventory most often ends up scrapped or stored indefinitely after a cancellation or downsize. The reuse opportunity is huge — most of this inventory is genuinely new, never deployed, and sitting on a laydown yard waiting for its second life.
That said, "new in the original wrap" can mean "five years on a yard pad through five winters." Every reel, every pallet of splice kits, every pad-mount transformer needs structured evaluation before deployment. This guide walks through the evaluation sequence Refound recommends for each major BoP component class.
Before you bid
Collection-system procurement starts with a clear understanding of project compatibility. Cable specs in particular are not interchangeable across MV voltage classes, conductor sizes, or insulation systems. Confirm:
- Voltage class. 15 kV, 25 kV, 35 kV — match your collection system design exactly
- Conductor size. AWG or kcmil, with attention to manufacturer-specific cross-section variations
- Insulation system. XLPE, TR-XLPE, EPR — system designs are typically locked to one type
- Construction code. ICEA S-94-649 (MV 5–46 kV) or ICEA S-108-720 (HV 46–230 kV)
- Conductor material. Copper or aluminum; aluminum dominates utility-scale collection at lower cost per unit ampacity
- Neutral configuration. Concentric neutral, tape shield, or single-conductor — system design dependent
MV cable on reels
The most common collection-system listing on Refound is medium-voltage cable on reels. Sources are typically project surplus (most reels never deployed), repower-decommissioned (rare for cable, more common for accessories), or OEM excess inventory.
For each reel, demand:
- Original cable cut sheet showing ICEA construction code, conductor size, insulation thickness, jacket type, and per-foot weight
- Reel records showing original length and any prior cuts. A reel that says "6,000 ft on the flange" but actually has 4,200 ft after prior cuts is a different procurement than the headline implied.
- Manufacture date stamped on the reel flange or cable jacket
- Megger insulation resistance test within 30 days of the listing date
- Jacket inspection photos showing reel condition, weather wear, and any visible damage
- High-pot test results for any cable that was previously installed and removed (rare; ask the question)
For reels that have been in outdoor storage longer than 5 years, expect to repeat the megger test before deployment regardless of the seller's records. Cable insulation tolerates outdoor storage better than most BoP gear, but it's not invulnerable.
Megger + insulation tests
Megger insulation resistance is the single most informative test on used MV cable. The basic procedure: apply a DC voltage (typically 5 kV for 15 kV class cable, 10 kV for higher classes) between conductor and shield, measure leakage current, calculate insulation resistance:
- Healthy MV cable: > 10 GΩ
- Acceptable for deployment: 1–10 GΩ
- Investigate before purchase: 100 MΩ – 1 GΩ
- Reject: < 100 MΩ
For high-pot tests on previously-installed cable, follow IEEE 400 guidelines for the test voltage and dwell time. Modern very-low-frequency (VLF) high-pot is the preferred test method for installed-cable verification; DC high-pot is more aggressive and can damage already-aged cable.
Partial discharge (PD) testing is the gold standard for cable insulation evaluation but requires specialized equipment and trained operators. Most secondary-market cable transactions don't include PD data; for revenue-grade installations, plan to do PD testing post-installation.
Splice kits + accessories
Cable accessories — splice kits, terminations, separable connectors, T-bodies, elbows — are the highest-shelf-life-risk items in BoP procurement. Cold-shrink and heat-shrink kits have manufacturer-specified shelf lives:
- Cold-shrink kits: typically 2–3 years from manufacture date
- Heat-shrink kits: typically 3–5 years from manufacture date
- Pre-mold kits (T-bodies, elbows): 5–10 years if stored properly
Beyond the manufacturer's shelf life, the rubber compounds lose elasticity and the inhibitor compounds migrate. A 6-year-old cold-shrink kit installed today will fail prematurely. Refound's collection-systems listings require accessory listings to carry the manufacture date stamp; refuse purchases without that data.
Storage condition matters too. Indoor controlled-temperature storage extends shelf life. Outdoor storage in a laydown yard does not. Ask for storage-condition photos.
Pad-mount distribution transformers
Pad-mount transformers (typical 25 kVA – 2.5 MVA, primary 12.47 / 13.8 / 25 / 34.5 kV, secondary 480 / 240 V) are a strong reuse category. Most utility cycle-outs are driven by load growth requiring an upsize — the existing transformer is operationally fine. Evaluation checklist mirrors the power transformer process at smaller scale:
- Nameplate verification (kVA, voltage class, vector group, BIL, oil type)
- Insulation resistance + polarization index
- Turns-ratio test, all taps
- DGA on the oil sample (if oil-filled)
- Tank corrosion + gasket integrity
- Bushing condition (inspect for chipped porcelain or oil weeping)
- Cabinet door + lock condition (security matters for outdoor pad-mounts)
- Any signs of past arc events (scorch marks inside the cabinet, melted bushings, etc.)
For pad-mounts manufactured pre-1979, PCB testing is mandatory regardless of the seller's representation. Mineral-oil transformers from that era have a non-trivial probability of PCB contamination.
OPGW + ADSS fiber
Fiber-optic cable in the collection system serves SCADA + protective relay communications. Two main types in utility use:
- OPGW (optical ground wire): Fiber bundles inside a metallic ground wire on the transmission line. Outer metallic shield protects fiber from UV + mechanical wear. Typically 30+ year service life; reuse is straightforward for OPGW from decommissioned lines.
- ADSS (all-dielectric self-supporting): All-polymer fiber cable, no metallic component. UV exposure degrades the polymer jacket over 15–20 years. Less commonly reused.
For either type, demand:
- Original construction date + commissioning OTDR (optical time-domain reflectometer) trace results
- Recent OTDR re-trace if the fiber has been in service
- Strand count + fiber type (single-mode vs. multi-mode; ITU G.652 vs G.655 vs G.657)
- Connector type at the terminations (LC, SC, FC) and any pigtail condition
- For OPGW: outer ground-wire conductor condition + gauge
Conduit + raceway
PVC, fiberglass, and steel conduit + raceway is one of the cheapest-per-foot items in BoP but the volume per project is enormous. Project-surplus reuse mostly comes down to:
- Verifying the trade size (1.5", 2", 3", 4") matches your design
- Schedule rating (40 vs 80) for PVC
- UV-resistant formulation for above-ground sections
- Storage condition (PVC sitting in direct sun for years can degrade even before installation)
- Quantity check + bundling consistency
Conduit bodies, fittings, and accessories follow the same rules. Reusable if dimensions match; less risk than cable accessories because the materials don't have shelf-life issues.
Freight + handling
Cable freight scales with reel size + count. A few practical anchors:
- Single full reel of 1000 kcmil 35 kV MV cable: 7–10 t, requires a flatbed with reel cradles
- 18-reel order: 18–22 truckloads (most reels travel one or two per truck due to weight)
- Per-reel handling cost: Often the largest fraction of the freight quote — loading/unloading time, not road miles
- Pad-mount transformer (500 kVA): 3–5 t, standard flatbed
- Splice kits + accessories: palletized; standard LTL
For partial reels (under 50% of original length), expect a 15–25% per-foot premium over full-reel pricing because of cable cutting + re-spooling labor. For partial pallets of accessories, expect an LTL freight premium.
Always verify the receiving site has a forklift with sufficient capacity (8,000+ lb for full reels of MV cable) and rigging support for any pad-mounts > 1 t.
Shelf-life management
The single most under-appreciated risk in BoP procurement is the shelf life of polymer-based components. A summary:
- MV cable (in original packaging on the reel): 5–10 years if stored covered; 2–3 years if stored uncovered
- Cold-shrink splice kits: 2–3 years from manufacture
- Heat-shrink splice kits: 3–5 years from manufacture
- Pre-mold T-bodies, elbows, and separable connectors: 5–10 years if stored indoors
- PVC conduit: 5+ years for indoor storage; 1–2 years if exposed to direct UV
- ADSS fiber: 15–20 years from installation; storage life on a reel is shorter due to cable bend-radius memory
Demand manufacture-date stamps on every accessory pallet. Refuse purchases without the date stamp; the price discount can never compensate for a failed splice in service.
Common red flags
- Cable reels without records. No way to verify length, age, or storage history.
- Splice kits without manufacture date stamps. Don't buy.
- "Storage at the site" without weather coverage photos. Often means uncovered laydown yard storage.
- Pad-mount transformers from pre-1980 without PCB test. Non-starter.
- Mismatched serial numbers across a single pallet. Inventory consolidation; harder to assess as a coherent lot.
- Fiber without OTDR trace data. No way to verify performance.
- "Take the whole laydown yard" deals. Mixed inventory in a bulk sale at a single price; often sourced this way because the seller doesn't have the documentation discipline to list line-by-line.
Pre-bid checklist
- Cut sheet + ICEA construction code per cable type
- Reel records (original length, any prior cuts)
- Manufacture date stamps on all accessories
- Megger / insulation resistance test results within 30 days
- Storage-condition photos (indoor vs. outdoor, weather coverage)
- Pad-mount transformer test data (IR + PI + DGA + nameplate)
- OTDR traces for fiber
- Per-reel weight + freight quote
- Forklift capacity confirmation at the receiving site
- For splice kits + accessories: storage temperature + humidity history
Collection-systems procurement rewards documentation discipline. The accessories with the longest shelf lives, the cable with the cleanest megger results, and the pad-mount transformers with the most complete test data deliver the least risk per dollar. Pricing should reflect that hierarchy, not just the per-foot or per-kVA headline.