Wire & Cable Harnessing for PCBA and Box-Build Integration

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Wire & Cable Harnessing for PCBA + Box-Build Integration

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Summary. EV and power assemblies fail when harness design, PCBA+ box-build integration, and test aren’t owned by one team. INDIC runs in-housewire & cable harnessing alongside your PCBAs and enclosures, proving fit (bend radius, strain relief, grommets), electrical integrity (continuity testing, hi-pot insulation), andsystem behavior (ICT/FCT/EOL)—all bound to serials in MES traceability.

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The integration problem we solve (EV & power electronics)

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Outsourced looms add hand-offs right when HV safety, EMI/grounding, and enclosure tolerances matter most. By keeping in-housewire & cable harnessing inside the PCBA+ box-build integration team, we shorten change cycles, aligns electrical + mechanicalconstraints early, and ships with clean evidence.

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Five integration controls that de-risk EV builds

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1) Mechanical fit first: bend radius, strain relief, service loops

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We model harness routing before enclosure close-out: bend radius rules, grommets and strain relief, connector keying, and service loops for rework. This prevents pin damage, over-tight radii, and pull-outs in vibration/thermal cycling.

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2) Electrical integrity: continuity testing & hi-pot insulation gates

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Every loom sees continuity testing; HV families add hi-potinsulation checks. Interlock/HVIL loops, polarity, and ground paths are validated before final seal. Fail = rework at source, not in the field.

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3) System tests that “know the harness”: ICT/FCT/EOL + JTAG

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Boards mated to the harness run ICT(opens/shorts/values), boundary-scan JTAG for BGA interconnects, FCT  with sensors/relays exercised, and EOL as the shipping gate. Tests include harness-specific nets(interlocks, sense lines) so coverage maps to real failure modes.

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4) Identity that travels: OBP programming + MES traceability

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We program on the line (OBP programming), bind firmware version/checksum to the unit, and store all results by serial in MES traceability. No-pass/no-ship blocks downstream movement; returns analysis is one query, not a hunt.

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5) Changeovers without chaos (LVHM variants)

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Kit integrity checks (inbound → line-side → first-article), label schemas, and torque/label/seal verifications keep variant swaps predictable. The same owner team controls loom, board, and enclosure changes.

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EV charger manufacturing: where harness integration moved the needle

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• Goal.  Ten chargers in five days for certification; legacy flow needed two weeks.
• What changed (harness-specific).  Harness cut/terminate/label ran in step with box-build;  cable entry points, grommets, and strain  relief set before potting; interlock/ground continuity checked at sub-assembly; loom  IDs tied to unit serials.
• Outcome.  Four-day  assembly cycle  with Day-5 delivery, stable audits, and cleaner rework paths because  harness + PCBA  + box-build integration  lived under one plan.

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Metal vs. plastic enclosures: integration tactics that differ

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• Metal  enclosures (chargers/controllers).
  Shielding/grounding strategy, busbar clearances, HV harness routing, and potting windows planned together; terminal torque + face protection verified at EOL.
• Plastic sealed box-builds.
  IP sealing paths, tie-downs, and bend radius rules prevent pinch and chafe; service labels and service loops keep maintenance realistic.

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What you provide; what our EMS company returns for Wire & Cable Harnessing

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You provide: connector series/pin maps, current and environment limits, enclosure drawings,board I/O, acceptance criteria.
INDICreturns: routedloom drawings with bend radius and strain relief, labelschema, continuity/hi-pot plan, a harness-aware ICT/FCT/EOLcoverage matrix, and a by-serial MEStraceability template that links harness IDs tofinished-goods serials.

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Wire & Cable Harnessing for PCBA and Box-Build Integration - Bottom Line

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Treat the loom as part of the product. With in-housewire & cable harnessing  embedded in PCBA+ box-build integration, INDIC proves fit, verifies continuity testing/hi-pot insulation,and closes system risk through ICT/FCT/EOL+ OBP—all recorded in MEStraceability. That’s how EV and power assemblies hit dates without yield surprises.

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