There are two ways to go about this: see what industrial, precision, and operational standards your manufacturer is certified in, and investigate the depth your supplier goes into inspecting raw materials and finished products. Things to look out for are RoHS compliance, ISO 9001 and QS-9000 certification, and a production process that uses a Total Quality Management (TQM) approach. With a high quality supplier, you’ll get the right wire/cable product the first time, and won’t have your project delayed because of performance, fit, or thermal issues.