Sample approval is the bridge between quotation and repeatable cable production. A sample should confirm more than appearance: it should verify the controlled drawing, connectors, electrical function, dimensions, workmanship, labels, packaging, and inspection expectations.
This guide helps B2B purchasing, engineering, and quality teams organize sample approval for custom cables, wire harnesses, molded cable assemblies, and industrial cable projects.
1. Freeze the quotation specification
Before sample production, confirm the drawing revision, connector and terminal references, cable structure, wire gauge, pinout, length, jacket, color, labels, quantity, testing, packaging, and destination requirements. Open questions should be listed rather than hidden inside email threads.
2. Confirm sample purpose and quantity
State whether the samples are for dimensional review, equipment fit, electrical testing, customer presentation, laboratory testing, or final production approval. Different purposes may require different quantities and documentation.
3. Review materials and approved equivalents
The sample should identify critical connectors, terminals, cable materials, overmold compounds, sleeving, labels, and packaging. If approved equivalents may be used later, define the approval process before mass production.
4. Inspect dimensions and connector orientation
- Overall length and branch lengths
- Connector face and key orientation
- Breakout, sleeve, tape, label, and tie positions
- Overmold dimensions and strain relief
- Installation clearance and bend direction
Use the cable drawing and tolerance guide to define controlled measurement points.
5. Verify electrical and functional performance
Typical approval checks include continuity, short circuit, pinout, insulation resistance, dielectric withstand, contact resistance, charging, data, sensor, or equipment function according to the project. The buyer should identify any fixture or mating equipment required.
6. Review workmanship and appearance
Check crimping, soldering, conductor exposure, molding, jacket condition, shield termination, labels, connector scratches, color, cleanliness, and overall appearance. Reference photos can clarify subjective cosmetic requirements.
7. Approve labels and packaging
Confirm product label, barcode, serial or lot information, protective caps, coil diameter, individual bag, cable tie, carton quantity, carton marks, private label artwork, and shipment protection.
8. Record approval and open issues
Approval should reference the sample quantity, drawing revision, test results, date, approver, approved deviations, and remaining actions. A conditional approval should clearly state what must change before mass production.
9. Control changes after approval
Connector, material, color, dimension, label, test, or packaging changes should be reviewed against the approved specification. Production should not rely on an unrecorded verbal change.
Sample approval checklist
- Drawing revision matches the sample
- Materials and connectors are identified
- Dimensions and orientation are accepted
- Electrical and functional tests pass
- Appearance and workmanship are accepted
- Labels and packaging are confirmed
- Deviation and change-control rules are recorded
Review the manufacturing process, compare quality support, or upload drawings for sample planning.