Who this checklist is for
I'm the office administrator for a 120-person company. I manage about $180,000 a year in indirect purchases across 11 vendors, everything from network cabling to medical device accessories for our service team. I report to operations and finance, which means I get it from both sides when an order is wrong.
This checklist is for the buyer who has to order cable and connector parts without being the engineer. It works for a cat 6 cable refresh, a usb c cable reorder, a router lan cable replacement, or a custom medical wire assembly. It is not for designing a new medical device. That's a different job.
Eight steps. Each one has a checkpoint. If you can't clear the checkpoint, don't send the PO.
Step 1: Write down the actual use case, not just the product name
Start with where the cable goes and what it touches. A cat6a ethernet cable in a clean server room is not the same as an outdoor cat 6a ethernet cable on a roof. A dental equipment cable has different handling needs than a defibrillator cable.
Ask: indoor or outdoor? Fixed or flexing? Length? Bend radius? Chemicals? Cleaning agents? Sterilization? Connector gender and pinout? Does it need to survive being yanked out of a pulse oximeter cable or a laparoscopic light cable?
Checkpoint: One paragraph that a stranger could read and understand. If you can't write it, you're not ready to order.
Step 2: Confirm the performance class before you compare price
Price comparisons are useless if the specs are different. For network cable, know whether you need cat6 utp lan cable, shielded Cat6a, or a rj45 cat6 ethernet cable assembly. TIA-568 rates Cat6 to 250 MHz and Cat6a to 500 MHz; that matters for run length and noise.
TIA-568 performance categories are a useful baseline: Cat6 is rated to 250 MHz; Cat6a is rated to 500 MHz. Ask for test data against the category you actually need.
For USB, not every high quality usb c cable is the same. Check power rating, data speed, and whether it needs an e-marker. A usb to uart cable or a uart radio programming lead is a different animal from a charging cable. For coax, a flexible coaxial cable and a coaxial sound cable may look similar but serve different jobs. For fiber, an analog optical link or camera link to fiber run needs the right connector polish and loss budget. A dwdm link is not a generic patch cable.
Checkpoint: The quote names the standard or performance class, not just the length and color.
Step 3: Get a drawing and pinout, not just a part number
This is the step most people skip. I know because I skipped it. We reordered a 3 lead ecg cable because it looked the same as last time. The connector keying was different. Not a huge dollar loss, but our service team lost a day and I looked bad to my VP.
For any ecg cable - ecg cable 3 lead, ecg cable 5 lead, 10 lead ecg cable, or ecg cable 12 lead - get the lead configuration, connector type, and pinout in writing. Same for a spo2 sensor cable, defibrillator accessories, or a medi cable assembly. If the supplier can't provide a drawing, that's your answer.
Checkpoint: A PDF drawing with dimensions, connector callouts, and pinout. Signed or acknowledged by the supplier.
Step 4: Verify documentation and traceability before you talk about medical-grade
I don't accept the phrase medical-grade on its own. It doesn't tell me anything I can check. Ask for the actual documents: material data, test reports, RoHS/REACH statements, UL listings where relevant, and quality system evidence. For medical cable assemblies, ask whether the supplier works under ISO 13485. For equipment safety, IEC 60601-1 is the reference point your engineers will care about.
This is where medical wire suppliers separate themselves. If you need fep insulation or a specific wire medical construction, ask for the material spec and temperature rating. For medical cables and sensors, ask how lots are traced. For an oxygen concentrator extension cord or outdoor power cable, confirm the jacket and plug rating.
Checkpoint: You have a document folder, not a verbal promise. If the documents are available upon request and never arrive, stop.
Step 5: Test a sample in the real device or run
A bench test is not enough. Plug the sample into the actual device. Flex it the way the user will. Route it through the same tray or cabinet. Check whether the wire terminal connectors or quick connect wire connectors stay seated. Pull on the waterproof cable connector and confirm the mating half is included.
For a server power cable, check the plug orientation and cord length in the rack. For an ethernet cable 6 ft patch run, check whether the boot fits the port density. For a cat 6 ethernet cable connector field termination, confirm the installer has the right tool. For cat6 outdoor ethernet cable or exterior cat6 cable, confirm UV and moisture exposure. Cat6a shielded outdoor cable and cat6a shielded direct burial cable are not interchangeable unless the jacket and rating say so.
Checkpoint: A signed sample approval. Date, person, device, result. No signature, no order.
Step 6: Check the connector system as a system
Connectors are where cheap orders go to die. A coaxial cable and connectors order is not complete until you confirm impedance, thread, and center pin. A romex connector has to match the box knockout and cable clamp range. A waterproof extension cord connector only works if the mating plug and gasket are the same family.
If someone quotes cat6a coax, stop and ask what they mean. Cat6a is twisted-pair copper. Coax is a different cable family. That quote is either a typo or a supplier who doesn't know the product.
Checkpoint: The mating connector, backshell, and strain relief are listed as separate line items or explicitly included.
Step 7: Lock the commercial details that finance will ask about
I learned this one the expensive way. In 2022 I found a great price on a small run of ethernet cable cord assemblies. The supplier couldn't issue a proper invoice - handwritten receipt only. Finance rejected the expense report and I ate about $900 from the department budget. Now I verify invoicing before I place any order.
Confirm MOQ, lead time, shipping terms, packaging labels, change-control notice, and the invoice format. If the item is custom - medical wire assembly, dental equipment cable, defibrillator cable - ask what happens if the drawing changes after the PO. Who pays for the old stock?
Checkpoint: A written quote with part number, revision, MOQ, lead time, and invoice terms. Not a text message.
Step 8: Do an incoming inspection, even if it's boring
We didn't have a formal sample sign-off process until the third wrong shipment. That's when I created a one-page checklist. Now receiving checks quantity, part number, revision, label, and a visual/functional sample. For medical cables, we log the lot. For network cable, we spot-check a run with a tester.
Checkpoint: The receiver signs the same checklist the buyer used. If it doesn't match, it goes to quarantine, not into the install bin.
Where this checklist is overkill
This is not the right process for every purchase. If you need one ethernet cable 6 ft patch cord for a desk, skip to step 7 and buy it. If you're prototyping a one-off camera link to fiber adapter, a full ISO 13485 supplier audit may be more than you need.
But if you're ordering custom medical cables and sensors, ecg cable sets, or defibrillator accessories that touch a patient, do not skip the drawing and sample steps. If you're under a deadline and can't wait for a sample, don't order a custom medical assembly. Buy a standard part or push the date. That's the honest trade-off.
And if you're buying cat6a shielded direct burial cable for a parking-lot run, confirm the burial rating and the surge/grounding plan. Outdoor cable is not automatically direct burial.
Common mistakes I still see
- Assuming outdoor power cable is the same as indoor cord. The jacket and temperature rating matter.
- Buying cat6 outdoor ethernet cable but using indoor RJ45 plugs and no strain relief.
- Ordering a waterproof cable connector without the mating half.
- Treating usb c cable as a commodity when the device needs a specific power or data profile.
- Accepting medical-grade instead of a document trail.
- Forgetting that coaxial sound cable, flexible coaxial cable, and coaxial cable and connectors are three different buying decisions.
This is the checklist I use with any supplier, including UNIEAN. If a line item doesn't have a drawing, a test report, or a sample sign-off, it doesn't get a PO. Not because I'm paranoid. Because I've paid for the lesson.