{"id":3789,"date":"2026-04-27T09:42:06","date_gmt":"2026-04-27T09:42:06","guid":{"rendered":"https:\/\/blogs.lcsc.com\/blog\/?p=3789"},"modified":"2026-05-13T06:27:32","modified_gmt":"2026-05-13T06:27:32","slug":"wire-harness-manufacturing-guide","status":"publish","type":"post","link":"https:\/\/blogs.lcsc.com\/blog\/wire-harness-manufacturing-guide\/","title":{"rendered":"Wire Harness Manufacturing Guide: Process, Standards &#038; Quality Criteria"},"content":{"rendered":"<h2><b><span data-font-family=\"Arial\">Key Takeaways<\/span><\/b><\/h2>\n<ul>\n<li><b><\/b><b><span data-font-family=\"Arial\">Six-stage manufacturing process: <\/span><\/b><span data-font-family=\"Arial\">wire cutting\/stripping \u2192 crimp termination \u2192 connector housing assembly \u2192 formboard lacing \u2192 protective sleeving\/marking \u2192 100% electrical test. Every stage has a documented acceptance criterion under <a href=\"https:\/\/www.lcsc.com\/search?q=IPC%252FWHMA-A-620&amp;s_z=n_q_IPC%252FWHMA-A-620\">IPC\/WHMA-A-620<\/a>.<\/span><\/li>\n<li><b><\/b><b><span data-font-family=\"Arial\">Crimp is the only acceptable primary termination: <\/span><\/b><span data-font-family=\"Arial\">soldering is explicitly prohibited for automotive harness conductor-to-terminal connections under IPC\/WHMA-A-620 Class 3. A solder joint wicks into strands, creating a vibration-failure stress concentration point.<\/span><\/li>\n<li><b><\/b><b><span data-font-family=\"Arial\">Crimp pull-force is the critical quality gate: <\/span><\/b><span data-font-family=\"Arial\"><a href=\"https:\/\/www.lcsc.com\/search?sid=6FC4D5B4E10D164DAE874A0C1A5193F3\">USCAR-2<\/a> Grade 3 requires \u226580 N pull-out force for 1.5 mm\u00b2 conductors. A crimp that passes visual inspection but fails pull-force will typically fail in the field within 3\u20135 years under vibration.<\/span><\/li>\n<li><b><\/b><b><span data-font-family=\"Arial\">Hi-pot testing is the only 100%-coverage insulation check: <\/span><\/b><span data-font-family=\"Arial\">applied at 2\u00d7 rated voltage (500 V AC for 12\/24 V systems; 1600 V DC for 800 V EV traction harnesses). Detects insulation damage from nicks, pinches, and abrasion that continuity testing cannot find.<\/span><\/li>\n<li><b><\/b><b><span data-font-family=\"Arial\">Formboard holds dimensional accuracy to \u00b15 mm: <\/span><\/b><span data-font-family=\"Arial\">on branches under 500 mm. Service loops of 50\u201380 mm at each ECU connector absorb vibration and thermal movement without fatigue-loading connector pins.<\/span><\/li>\n<li><b><\/b><b><span data-font-family=\"Arial\">Manual assembly remains dominant below 500,000 harnesses\/year: <\/span><\/b><span data-font-family=\"Arial\">fully automated cut-strip-crimp lines require \u00a3150,000\u2013\u00a3500,000 per line NRE and are justified only at high volume with low variant complexity.<\/span><\/li>\n<\/ul>\n<h2><b><span data-font-family=\"Arial\">What Is Wire Harness Manufacturing?<\/span><\/b><\/h2>\n<p><span data-font-family=\"Arial\">Wire harness manufacturing<\/span> is the structured process of cutting, terminating, assembling, and testing individual insulated conductors into an integrated electrical distribution sub-assembly. The finished harness replaces point-to-point wiring in a vehicle or machine with a single, pre-routed bundle that installs in minutes rather than hours.<\/p>\n<p>Manufacturers define each harness using a formboard layout drawing or 3D digital model. This model specifies wire routes, branch lengths (typically \u00b15 mm on branches under 500 mm, \u00b110 mm on long runs), connector orientation, P-clip positions, and sleeving boundaries. Furthermore, all operations follow a traveller document traceable to the customer engineering release.<\/p>\n<h2><b><span data-font-family=\"Arial\">Key Attributes<\/span><\/b><\/h2>\n<ul>\n<li><b><\/b><b><span data-font-family=\"Arial\">Governing standard: <\/span><\/b><span data-font-family=\"Arial\">IPC\/WHMA-A-620 Class 3 (automotive\/hi-rel) or Class 2 (commercial)<\/span><\/li>\n<li><b><\/b><b><span data-font-family=\"Arial\">Conductor range: <\/span><\/b><span data-font-family=\"Arial\">0.35 mm\u00b2 (signal) to 95 mm\u00b2 (HV traction), per ISO 6722<\/span><\/li>\n<li><b><\/b><b><span data-font-family=\"Arial\">Crimp standards: <\/span><\/b><span data-font-family=\"Arial\">USCAR-2 (tensile pull), cross-section fill ratio 60\u201380% per IPC-A-620<\/span><\/li>\n<li><b><\/b><b><span data-font-family=\"Arial\">Primary test methods: <\/span><\/b><span data-font-family=\"Arial\">continuity\/shorts, hi-pot at 2\u00d7 rated voltage, pull-force per USCAR-2<\/span><\/li>\n<li><b><\/b><b><span data-font-family=\"Arial\">Quality system: <\/span><\/b><span data-font-family=\"Arial\"><a href=\"https:\/\/www.lcsc.com\/search?sid=0D9348A70EF133ABF49BC677F9F4A21D\">IATF 16949<\/a> with full lot traceability (date-coded reels, CoC per shipment)<\/span><\/li>\n<\/ul>\n<h2><b><span data-font-family=\"Arial\">What Are the Key Features and Advantages of Professional <\/span><\/b><b><span data-font-family=\"Arial\">Wire Harness Manufacturing<\/span><\/b><b><span data-font-family=\"Arial\">?<\/span><\/b><\/h2>\n<h3><b><span data-font-family=\"Arial\">Crimp-Dominated Process for Repeatable, Gas-Tight Terminations<\/span><\/b><\/h3>\n<p><span data-font-family=\"Arial\">The core of wire harness manufacturing is controlled crimp termination. A correctly executed crimp cold-welds conductor strands to the terminal barrel, producing a gas-tight joint with contact resistance Rc &lt; 1 m\u03a9 and a tensile pull-out force meeting USCAR-2 Grade 3 minimums (\u226580 N for 1.5 mm\u00b2 wire). Automated crimp applicators apply force-displacement monitoring on every cycle, flagging deviations &gt; 5% from the golden-sample profile, which virtually eliminates under-crimped or over-crimped joints.<\/span><\/p>\n<h3><b><span data-font-family=\"Arial\">Manufacturing Rule: Soldering Is Not an Acceptable Primary Termination<\/span><\/b><\/h3>\n<p><span data-font-family=\"Arial\">Soldering is explicitly prohibited for conductor-to-terminal connections in automotive harnesses under IPC\/WHMA-A-620 Class 3. Solder wicks into conductor strands, reducing flexibility and creating a stress concentration point that fractures under vibration. The only acceptable solder use case in harness manufacturing is shield drain wire bonding at defined grounding points, performed with eutectic solder and heat-shrink strain relief. All conductor-to-terminal connections must be mechanically crimped.<\/span><\/p>\n<h3><b><span data-font-family=\"Arial\">Formboard-Based Assembly for Dimensional Accuracy<\/span><\/b><\/h3>\n<p><span data-font-family=\"Arial\">Harnesses are assembled on scaled 1:1 formboards that pin branch points, connector positions, and clip locations to drawing tolerances. This method holds branch-length repeatability to \u00b15 mm across a 2 m assembly and ensures consistent service loops at each ECU connector, a 50\u201380 mm loop that absorbs vehicle vibration without fatigue loading connector pins.<\/span><\/p>\n<h3><b><span data-font-family=\"Arial\">In-Line Continuity and Hi-Pot Testing for 100% Coverage<\/span><\/b><\/h3>\n<p><span data-font-family=\"Arial\">Every automotive harness undergoes 100% electrical testing before release. First, continuity\/shorts testing verifies each circuit against the netlist in &lt; 30 seconds using multi-point flying-lead or dedicated test fixture. Hi-pot testing applies 2\u00d7 rated voltage (typically 500 V AC for 12\/24 V systems) for 1 second, confirming insulation resistance Rins &gt; 100 M\u03a9 and detecting any assembly damage that continuity testing cannot detect.<\/span><\/p>\n<h3><b><span data-font-family=\"Arial\">Zone-Segregated Protective Sleeving for Long Service Life<\/span><\/b><\/h3>\n<p><span data-font-family=\"Arial\">Sleeving specification is driven by thermal zone mapping. PA12 corrugated conduit (rated +150\u00b0C continuous) protects underbody and engine bay branches. Woven PA cloth tape is applied at chafe points and clamp interfaces. Self-amalgamating PVC tape seals branch-off points to prevent moisture ingress in underbody zones, maintaining Rins &gt; 100 M\u03a9 across the 15-year vehicle service life.<\/span><\/p>\n<h3><b><span data-font-family=\"Arial\">Documented Traceability from Reel to Vehicle<\/span><\/b><\/h3>\n<p><span data-font-family=\"Arial\">IATF 16949-compliant manufacturing requires full lot traceability. Each conductor reel carries a date code and ISO 6722 test certificate. Crimp terminal bags are barcode-labelled to the purchase order. Finished harnesses carry a unique serial or barcode label linking them to the production traveller, crimp force records, and electrical test data.<\/span><\/p>\n<h2><b><span data-font-family=\"Arial\">Technical Specifications<\/span><\/b><\/h2>\n<table style=\"height: 466px;\" width=\"654\">\n<tbody>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"186\"><b><span data-font-family=\"Arial\">Parameter<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"120\"><b><span data-font-family=\"Arial\">Symbol \/ Standard<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"93\"><b><span data-font-family=\"Arial\">Typical Range<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"60\"><b><span data-font-family=\"Arial\">Unit<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"164\"><b><span data-font-family=\"Arial\">Notes<\/span><\/b><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"186\"><b><span data-font-family=\"Arial\">Wire Cut Length Tolerance<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"120\"><span data-font-family=\"Arial\">IPC\/WHMA-A-620<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"93\"><span data-font-family=\"Arial\">\u00b15 \/ \u00b110<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"60\"><span data-font-family=\"Arial\">mm<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"164\"><span data-font-family=\"Arial\">Short branches \u00b15 mm; long runs \u00b110 mm<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"186\"><b><span data-font-family=\"Arial\">Crimp Pull-Out Force (1.5 mm\u00b2)<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"120\"><span data-font-family=\"Arial\">USCAR-2 Grade 3<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"93\"><span data-font-family=\"Arial\">\u226580<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"60\"><span data-font-family=\"Arial\">N<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"164\"><span data-font-family=\"Arial\">Minimum tensile per USCAR-2 Sec. 4.6<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"186\"><b><span data-font-family=\"Arial\">Crimp Contact Resistance<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"120\"><span data-font-family=\"Arial\">Rc \/ USCAR-2<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"93\"><span data-font-family=\"Arial\">&lt; 1 (LV) \/ &lt; 2 (HV)<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"60\"><span data-font-family=\"Arial\">m\u03a9<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"164\"><span data-font-family=\"Arial\">HV EV: &lt; 2 m\u03a9 after 10,000 mate cycles<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"186\"><b><span data-font-family=\"Arial\">Insulation Resistance<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"120\"><span data-font-family=\"Arial\">Rins \/ ISO 6722-1<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"93\"><span data-font-family=\"Arial\">&gt; 100<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"60\"><span data-font-family=\"Arial\">M\u03a9\u00b7km<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"164\"><span data-font-family=\"Arial\">After thermal conditioning at 500 V DC<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"186\"><b><span data-font-family=\"Arial\">Hi-Pot Test (12\/24 V system)<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"120\"><span data-font-family=\"Arial\">IPC\/WHMA-A-620<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"93\"><span data-font-family=\"Arial\">500 \/ 1000<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"60\"><span data-font-family=\"Arial\">V AC \/ 1s<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"164\"><span data-font-family=\"Arial\">2\u00d7 rated voltage; no breakdown or &gt; 1 mA leakage<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"186\"><b><span data-font-family=\"Arial\">Hi-Pot Test (HV EV, 800 V)<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"120\"><span data-font-family=\"Arial\">ISO 6469-3<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"93\"><span data-font-family=\"Arial\">1600<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"60\"><span data-font-family=\"Arial\">V DC \/ 60s<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"164\"><span data-font-family=\"Arial\">Also requires interlock circuit verification<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"186\"><b><span data-font-family=\"Arial\">Service Loop Length at ECU<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"120\"><span data-font-family=\"Arial\">OEM design rule<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"93\"><span data-font-family=\"Arial\">50\u201380<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"60\"><span data-font-family=\"Arial\">mm<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"164\"><span data-font-family=\"Arial\">Absorbs vibration and thermal movement<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"186\"><b><span data-font-family=\"Arial\">P-Clip Spacing (engine bay)<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"120\"><span data-font-family=\"Arial\">IPC\/WHMA-A-620<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"93\"><span data-font-family=\"Arial\">150\u2013200<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"60\"><span data-font-family=\"Arial\">mm<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"164\"><span data-font-family=\"Arial\">300 mm max in interior zones<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2><span lang=\"EN-US\">The Six-Stage Manufacturing Process<\/span><\/h2>\n<h3><strong>Stage 1 \u2014 Wire Cutting and Stripping<\/strong><\/h3>\n<p>Automated wire cutting machines (such as Komax or Schleuniger) cut conductors to the specified length \u00b15 mm and strip both ends to the crimp barrel strip length from the terminal datasheet, typically 5\u201310 mm. Blade depth calibration also guarantees zero nicked conductor strands per IPC\/WHMA-A-620 Class 3. For differential pairs, manufacturers cut twisted-pair conductors for CAN\/LIN and Ethernet with twist pitch held to engineering specification (\u00b12 mm\/m) to maintain differential impedance tolerance.<\/p>\n<h3><strong>Stage 2 \u2014 Terminal Crimping<\/strong><\/h3>\n<p>Dedicated applicators in bench presses or fully automated cut-strip-crimp machines perform terminal crimping. First, each applicator is set up from a golden-sample cross-section confirming conductor fill ratio of 60\u201380% in the wire barrel. Then, CFA systems monitor every production crimp by recording force-vs-displacement and automatically rejecting any terminal outside \u00b15% of peak force from the golden-sample reference.<\/p>\n<h3><strong>Stage 3 \u2014 Connector Housing Assembly<\/strong><\/h3>\n<p>Operators seat terminated wires into <a href=\"https:\/\/blogs.lcsc.com\/blog\/connector-housing-selection-guide-material-pitch-retention-environmental-rating\/\">connector housings<\/a> by hand or with semi-automated insertion tooling. Next, a secondary lock, a connector position assurance (CPA) or terminal position assurance (TPA) device, confirms correct insertion, because it can only engage when all terminals are fully seated. On EV HV circuits, operators also tighten torqued fastener connectors to the OEM&#8217;s specified torque (\u00b110%) and verify the result with torque-indicating tooling.<\/p>\n<h3><strong>Stage 4 \u2014 Sub-Harness Assembly and Lacing on Formboard<\/strong><\/h3>\n<p>Assemblers lay individual terminated wires and connector sub-assemblies onto a 1:1 scaled formboard. They then bundle and secure branches with PVC or cloth tape at half-lap (50% overlap minimum per IPC\/WHMA-A-620). Before lacing, operators also cut corrugated PA12 conduit to length and install P-clips at 150\u2013200 mm intervals in underbody and engine bay zones.<\/p>\n<h3><strong>Stage 5 \u2014 Protective Sleeving and Marking<\/strong><\/h3>\n<p>Next, operators apply protective materials per the zone thermal map: self-amalgamating tape at grommet interfaces, split loom conduit on exposed underbody branches, and heat-shrink end caps at conduit terminations. Finally, operators scan all labels, barcode, sequential serial number, and circuit identifier, into the production traceability system before the harness moves to electrical test.<\/p>\n<h3><strong>Stage 6 \u2014 Electrical Test<\/strong><\/h3>\n<p>First, all harnesses undergo 100% continuity and shorts testing as a baseline check. Second, hi-pot testing at 2\u00d7 rated voltage confirms Rins &gt; 100 M\u03a9 across all circuits, catching insulation damage that continuity testing cannot detect. For EV HV harnesses, operators also measure interlock circuit continuity and isolation resistance at 1,600 V DC. At last, any failed assemblies are quarantined, fault-found, repaired or scrapped, and fully retested before release.<\/p>\n<h2><b><span data-font-family=\"Arial\">Manual vs Automated Wire Harness Manufacturing<\/span><\/b><\/h2>\n<table style=\"height: 370px;\" width=\"620\">\n<tbody>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"200\"><b><span data-font-family=\"Arial\">Parameter<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"212\"><b><span data-font-family=\"Arial\">Manual \/ Semi-Automated<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"212\"><b><span data-font-family=\"Arial\">Fully Automated<\/span><\/b><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"200\"><b><span data-font-family=\"Arial\">Typical Annual Volume<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"212\"><span data-font-family=\"Arial\">1,000 \u2013 500,000 harnesses\/year<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"212\"><span data-font-family=\"Arial\">500,000+ harnesses\/year<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"200\"><b><span data-font-family=\"Arial\">Setup Investment<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"212\"><span data-font-family=\"Arial\">Low (formboards, benchtop presses)<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"212\"><span data-font-family=\"Arial\">High (\u00a3150,000\u2013\u00a3500,000 per line)<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"200\"><b><span data-font-family=\"Arial\">Variant Flexibility<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"212\"><span data-font-family=\"Arial\">High; formboard changeover &lt; 30 min<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"212\"><span data-font-family=\"Arial\">Moderate; each variant requires NC reprogramming<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"200\"><b><span data-font-family=\"Arial\">Crimp Quality Control<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"212\"><span data-font-family=\"Arial\">CFA per press; manual cross-section at changeover<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"212\"><span data-font-family=\"Arial\">Inline CFA + vision on every cycle; automatic reject<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"200\"><b><span data-font-family=\"Arial\">Labour Content<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"212\"><span data-font-family=\"Arial\">High (60\u201380% of unit cost)<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"212\"><span data-font-family=\"Arial\">Low (10\u201325% at volume)<\/span><\/td>\n<\/tr>\n<tr>\n<td colspan=\"1\" rowspan=\"1\" width=\"200\"><b><span data-font-family=\"Arial\">Best Application<\/span><\/b><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"212\"><span data-font-family=\"Arial\">Prototype, complex geometry, low-to-mid volume<\/span><\/td>\n<td colspan=\"1\" rowspan=\"1\" width=\"212\"><span data-font-family=\"Arial\">High-volume simple harnesses (door sub-harness, pigtails)<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2><b><span data-font-family=\"Arial\">Quick Selection Guide: Wire Harness Manufacturing in 60 Seconds<\/span><\/b><\/h2>\n<ul>\n<li><span data-font-family=\"Arial\"><strong>Automotive safety-critical circuits<\/strong> (engine, chassis, HV) \u2192 IPC\/WHMA-A-620 Class 3; USCAR-2 pull-force \u226580 N for 1.5 mm\u00b2; 100% hi-pot at 2\u00d7 rated voltage<\/span><\/li>\n<li><span data-font-family=\"Arial\">Interior non-safety circuits (infotainment, lighting) \u2192 IPC\/WHMA-A-620 Class 2 acceptable<\/span><\/li>\n<li><strong>EV high-voltage traction harness<\/strong> (400\u2013800 V DC) \u2192 Orange-jacketed XLPE 35\u201395 mm\u00b2; hi-pot at 1,600 V DC \/ 60 s per ISO 6469-3; HV PPE mandatory during assembly<\/li>\n<li><span data-font-family=\"Arial\"><strong>Engine bay routing<\/strong> \u2192 XLPE insulation (+125\u00b0C); P-clips at 150\u2013200 mm; 50\u201380 mm service loop at each ECU connector<\/span><\/li>\n<li><span data-font-family=\"Arial\"><strong>High-volume simple harness<\/strong> (&gt; 500,000\/year) \u2192 Fully automated cut-strip-crimp; NRE investment \u00a3150k\u2013\u00a3500k; 3\u20135 year amortisation target<\/span><\/li>\n<li><strong>Prototype or pre-production harness<\/strong> \u2192 Manual assembly on formboard; semi-automated crimping; PPAP Level 3 submission before production release<\/li>\n<li><span data-font-family=\"Arial\"><strong>Sourcing components for in-house assembly<\/strong> \u2192 Require IATF 16949 certificate, ISO 6722 CoC per lot, USCAR-2 test data, RoHS DoC, and REACH SVHC declaration from each supplier<\/span><\/li>\n<\/ul>\n<h2><b><span data-font-family=\"Arial\">FAQ: Common Questions<\/span><\/b><\/h2>\n<h3><b><span data-font-family=\"Arial\">What IPC\/WHMA-A-620 class should I specify for an automotive harness?<\/span><\/b><\/h3>\n<p><span data-font-family=\"Arial\">Specify Class 3 for all safety-critical and under-hood circuits. Class 3 requires zero nicked conductor strands, crimp fill ratio 60\u201380% confirmed by cross-section, pull-out force \u2265 <a href=\"https:\/\/www.lcsc.com\/search?sid=6FC4D5B4E10D164DAE874A0C1A5193F3\">USCAR-2<\/a> minimums, and 100% hi-pot testing. In contrast, Class 2 is acceptable for interior non-safety circuits such as lighting and infotainment, where the relaxed acceptance criteria still meet functional life requirements.<\/span><\/p>\n<h3><b><span data-font-family=\"Arial\">How do I calculate the correct strip length for a crimp terminal?<\/span><\/b><\/h3>\n<p><span data-font-family=\"Arial\">Strip length equals the wire barrel length of the terminal plus 0.5 mm. After stripping, conductor strands should protrude 0.5\u20131.0 mm beyond the wire barrel end in the crimp inspection window. Excess strip length (\u22652 mm protrusion) creates a short-circuit risk in adjacent circuits; insufficient length (&lt; 0 mm protrusion) indicates incomplete insertion and will fail the USCAR-2 pull-force test.<\/span><\/p>\n<h3><b><span data-font-family=\"Arial\">What is the correct method to prevent harness vibration fatigue in an engine bay?<\/span><\/b><\/h3>\n<p><span data-font-family=\"Arial\">Secure branches with polyamide P-clips at 150\u2013200 mm maximum intervals in all engine bay and chassis zones. Maintain 6\u00d7 OD minimum static bend radius at all turns; increase to 10\u00d7 OD at any flex or hinge point. Provide a 50\u201380 mm service loop at every ECU connector. Apply damping woven cloth tape at branch-off points to raise local resonant frequency above the 10\u201380 Hz excitation band of engine-mounted components.<\/span><\/p>\n<h3><b><span data-font-family=\"Arial\">Is soldering acceptable as a substitute for crimping in harness manufacturing?<\/span><\/b><\/h3>\n<p><span data-font-family=\"Arial\">No. Soldering is not an acceptable primary termination method for automotive harnesses. In fact, IPC\/WHMA-A-620 Class 3 explicitly prohibits it as a repair method as well. Solder wicks into conductor strands, reducing flexibility and creating a stress concentration point that fails under vibration. The only automotive-acceptable solder use case is for shield drain wire bonding at defined grounding points, with eutectic solder and heat-shrink strain relief.<\/span><\/p>\n<h3><b><span data-font-family=\"Arial\">What compliance documents must a harness manufacturer provide for an automotive program?<\/span><\/b><\/h3>\n<p>(1) an IATF 16949 certificate covering the manufacturing site;<\/p>\n<p>(2) a PPAP Level 3 submission including crimp pull-force data by lot and hi-pot test records;<\/p>\n<p>(3) a CoC citing ISO 6722 and USCAR-2 per delivery lot;<\/p>\n<p>(4) a RoHS Declaration of Conformity per EU Directive 2011\/65\/EU;<\/p>\n<p>(5) a REACH SVHC declaration below 0.1% w\/w;<\/p>\n<p>(6) an insulation compound MSDS. For EV HV harnesses, also require ISO 6469-3 compliance data and voltage withstand test reports at 2\u00d7 rated voltage for 60 seconds.<\/p>\n<h3><strong><span lang=\"EN-US\">How Wire Harnesses Are Manufactured and Procured<\/span><\/strong><\/h3>\n<p><span data-font-family=\"Arial\">Manufacturers produce wire harnesses under an IATF 16949 Quality Management System, with conductors qualified to ISO 6722 and connectors to USCAR-2. Reliability testing includes thermal shock per IEC 60068-2-14, salt spray per IEC 60068-2-11 (96\u2013240 hours), and vibration endurance per IEC 60068-2-6 at 10 g, 10\u20132000 Hz. Full lot traceability is mandatory for automotive Tier-1 supply chains.<\/span><\/p>\n<h2><b><span data-font-family=\"Arial\">Conclusion<\/span><\/b><\/h2>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">Wire harness manufacturing is a precision process where quality comes down to two non-negotiable criteria: crimp pull-force and hi-pot test coverage. A harness that passes continuity testing but fails pull-force will fail in the field under vibration. Similarly, a harness that passes pull-force but skips hi-pot will develop insulation failures that remain invisible until a short occurs in service. So, both checks are essential, neither one alone is sufficient.<\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">In short, document both with lot traceability, and the harness will outlast the vehicle.<\/p>\n<h2><b><span data-font-family=\"Arial\">Find What You Need on <a href=\"https:\/\/www.lcsc.com\/\">LCSC<\/a><\/span><\/b><\/h2>\n<p><span data-font-family=\"Arial\">Browse automotive-grade wires, <a href=\"https:\/\/blogs.lcsc.com\/blog\/connector-alternatives-list-lcsc-electronics\/\">connectors<\/a>, terminals, protective sleeving, and cable ties on LCSC from authorised distributors with full RoHS and REACH documentation. Standard terminal MOQs from 1,000 units; bulk wire ships on 100 m spools with 2\u20134 week lead times.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Key Takeaways Six-stage manufacturing process: wire cutting\/stripping \u2192 crimp termination \u2192 connector housing assembly \u2192 formboard lacing \u2192 protective sleeving\/marking \u2192 100% electrical test. Every stage has a documented acceptance criterion under IPC\/WHMA-A-620. Crimp is the only acceptable primary termination: soldering is explicitly prohibited for automotive harness conductor-to-terminal connections under IPC\/WHMA-A-620 Class 3. A solder [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"iawp_total_views":13,"footnotes":""},"categories":[192],"tags":[64,274,273],"class_list":["post-3789","post","type-post","status-publish","format-standard","hentry","category-custom-cables","tag-custom-cables","tag-wire-harness","tag-wire-harness-manufacturing"],"blocksy_meta":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Wire Harness Manufacturing Guide - LCSC<\/title>\n<meta name=\"description\" content=\"Guide to wire harness manufacturing covering processes, design rules, materials, IPC\/WHMA\u2011A\u2011620, EV HV, testing, and OEM sourcing.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blogs.lcsc.com\/blog\/wire-harness-manufacturing-guide\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Wire Harness Manufacturing Guide - LCSC\" \/>\n<meta property=\"og:description\" content=\"Guide to wire harness manufacturing covering processes, design rules, materials, IPC\/WHMA\u2011A\u2011620, EV HV, testing, and OEM sourcing.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/blogs.lcsc.com\/blog\/wire-harness-manufacturing-guide\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog | LCSC Electronics\" \/>\n<meta property=\"article:published_time\" content=\"2026-04-27T09:42:06+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-05-13T06:27:32+00:00\" \/>\n<meta name=\"author\" content=\"LCSC Editor\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"LCSC Editor\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"10 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/blogs.lcsc.com\\\/blog\\\/wire-harness-manufacturing-guide\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/blogs.lcsc.com\\\/blog\\\/wire-harness-manufacturing-guide\\\/\"},\"author\":{\"name\":\"LCSC Editor\",\"@id\":\"https:\\\/\\\/blogs.lcsc.com\\\/blog\\\/#\\\/schema\\\/person\\\/11d3b92d0208775e62d7f79a0da4e781\"},\"headline\":\"Wire Harness Manufacturing Guide: Process, Standards &#038; 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