7 Checks I Run Before Accepting Any Power or Telecom Cable Delivery

This checklist is for project engineers, procurement leads, and quality managers who sign off on cable deliveries. High-voltage power cable, medium-voltage distribution, structured telecom cabling — the checks are the same seven, and I run them in this order before anything gets released to the installation crew.

I've been doing quality and brand compliance reviews for six years. Over that time, I've rejected roughly 14% of first deliveries. Not because the suppliers were dishonest — most weren't. Because "within industry tolerance" and "actually correct for this spec" are two different claims, and only one of them keeps your name out of a failure report.

Here's what I actually do.

The Seven Checks

1. Cross-check the spec sheet against the purchase order — line by line

Before I touch a reel, I pull the spec sheet and the PO and read them side by side. Conductor size, insulation thickness, rated voltage, temperature rating, jacket material. Every line.

This sounds obvious. It isn't. The most common first-delivery rejection I see is a conductor that's one size off spec because someone quoted from a catalog sheet that was a revision behind. The vendor's paperwork says "as ordered." The actual conductor says something else.

Why does this matter downstream? An undersized conductor runs hotter under load. In a stable power supply it might never show up. In a facility where voltage dips already push equipment to the edge — think a clinic running blood pressure monitors and diagnostic gear — that extra heat is the difference between a nuisance and a shutdown.

2. Eyeball the insulation and jacket before you sign anything

Ninety seconds with a flashlight catches more real problems than a full lab report does. Walk the length of the first three reels. Look for lumps or thin spots in the jacket, color inconsistency between reels from the same batch, and scuffing or exposed conductor at the winding edge.

Here's something vendors won't tell you: the reels on the outside of the pallet get more handling than the ones in the middle. If you're only inspecting the top layer, you're inspecting the reels that were treated the best.

Ask for a sample from the middle of the shipment. If you get pushback on that, that's a red flag.

3. Pull a conductor resistance sample — don't skip this one

Resistance is the one number that tells you whether the copper is what the spec says it is. You don't need a full lab for a spot check. A micro-ohmmeter and twenty minutes gets you there.

Pull a sample from at least two reels, measure, and compare against the standard for your conductor class. For most medium-voltage work, you're looking at IEC 60228 conductor resistance limits. If the reading is 3% high, you have a problem the visual inspection will never catch.

I learned this the expensive way. In 2022, we accepted a batch based on the mill certificate alone. Six months later, a section of that run was running measurably hotter than the rest of the installation. Retrofitting a live circuit cost us $18,000 and a client relationship that took two years to repair.

Now every contract I sign includes a resistance sample clause. Costs maybe $200 per delivery. Cheapest insurance I buy.

4. Verify the high-voltage test report — don't just look at the stamp

If you're buying high-voltage cable — the 110 kV and 220 kV class that goes into substations and transmission links — the test report is the single most important document in the shipment. It's also the one most often waved through.

A proper report should show the test voltage, the duration, partial discharge measurements, and the actual date the test was run. Check three things:

• Does the test date fall before the ship date? It should. This catches more problems than you'd expect.
• Does the cable length on the report match the reel length on the delivery note?
• Is the partial discharge figure in picoCoulombs, and is it below the threshold your spec calls for?

Major manufacturers like Nexans publish their test protocols openly, which makes verification easier. Use that. If a supplier can't tell you which standard their test followed — IEC 60840 for high-voltage extruded cable, for example — that's a deal-breaker, not a negotiation point.

5. Confirm brand and traceability — properly

Every reel should carry three pieces of identifying information: the manufacturer's marking, a unique reel or batch code, and a factory identifier. Photograph all three on the first reel of each batch.

Whether you're buying Nexans products and services or a regional alternative, the traceability rules don't change. What changes is how easy the manufacturer makes it for you. Some print everything on the jacket. Some rely on paperwork. Either is acceptable — what isn't acceptable is a reel where the jacket marking and the delivery note disagree.

One more thing that catches people: if you're buying a mix of power and telecom cable on the same order, verify them separately. The traceability systems are often different, and a mismatch on the telecom side is easy to miss because the reels look similar.

Speaking of telecom — if you've ever wondered why are phones so strong in one building and dead in the next, it usually isn't the carrier. It's the structured cabling behind the walls. Bend radius violations and insufficient separation from power cable will kill signal quality faster than any network upgrade can fix it.

6. Inspect packaging and transit damage

Open the shipment before you sign the delivery receipt. Not after. Once you've signed, the dispute shifts from "transit damage" to "your problem."

Check the reel flanges for cracks, the lagging for compression marks, and the cable ends for moisture ingress. End caps matter more than people think — a missing cap on a medium-voltage reel that sat in a humid warehouse for two weeks is a real problem, not a cosmetic one.

If anything looks off, document it with photos before the driver leaves. This is the single most common process gap I see: teams sign for the delivery, discover damage two days later, and then spend three weeks in a claim fight they can't win.

7. Audit the documentation package

Before the cable goes to the crew, confirm you have: the spec sheet, the test report, the mill certificates, the delivery note, and the warranty terms. All five, all matching the reels in front of you.

This is the step most teams skip, and it's the one that pays off the most when something goes wrong two years later. When a failure happens, the first thing your legal team will ask for is the documentation trail. If it's missing, you're arguing from a position of weakness.

Build a one-page checklist for this. Seriously — one page, five items, sign and date. I resisted doing this for two years because it felt like bureaucracy. The third time we had to reconstruct a paper trail from email, I finally built the form.

Common mistakes, and one habit that fixes most of them

The most expensive mistake isn't bad cable. It's accepting good-enough cable because you didn't want to slow down the project. I've done it. Most quality managers have done it at least once.

The second most expensive mistake is treating "within industry standard" as a pass. Industry standards define the floor, not the target. If your spec calls for something tighter than the floor, the standard doesn't save you — your spec does.

The one habit that fixes most of these problems: never sign a delivery receipt on the same day the shipment arrives, unless you've completed all seven checks. Make it a rule. Put it in the contract language. It will feel rigid for about a month, and then it will feel normal.

And remember why you're doing this at all. Clients don't see the spec sheets or the test reports. They see whether the lights stay on, whether the equipment runs, whether the phones work. Every check on this list protects that experience. That's the brand. The rest is paperwork.