Medium-Voltage Switchgear OEMs
Cable assemblies inside MV (5 kV - 38 kV) switchgear and metal-clad enclosures — control wiring, instrument transformer leads, and protection-relay panel interconnect.
Cable Assembly
Switchgear Cable Assembly — Custom Wire Harness for MV/LV Power Equipment
Internal cable assemblies and penetration harnesses for medium-voltage and low-voltage switchgear, panelboards, and utility distribution equipment. Multi-core penetration harnesses, MIL-spec aviation connector cables, PPAP-qualified replacement parts, and arc-flash-aware build discipline.
Quality Submission ReadyPPAP L2
Switchgear CoverageMV + LV
Tier-1 Program History5+ yr
Process DisciplineIATF
Application Context
Cable assemblies built for the inside of switchgear
Internal cable assemblies and penetration harnesses for medium-voltage and low-voltage switchgear, panelboards, and utility distribution equipment. Multi-core penetration harnesses, MIL-spec aviation connector cables, PPAP-qualified replacement parts, and arc-flash-aware build discipline.
Cable assemblies built for the inside of medium-voltage and low-voltage switchgear, where arc-flash energy, thermal margin, and traceability are non-negotiable. Inside a switchgear cabinet there is no second chance — every harness has to behave under thermal stress, vibration, and possible arc-flash energy.
Applications
Switchgear & Power Equipment Programs
Where these harnesses ship — utility, industrial, and renewable power distribution
Low-Voltage Panelboard Manufacturers
Internal harnesses for LV panelboards, motor control centers (MCCs), and distribution boards. Control wiring, breaker secondary contacts, and busbar-to-breaker tap leads.
Utility Substation Programs
Substation control house wiring, RTU panel harnesses, and outdoor-rated cable assemblies for distribution and transmission substations.
Renewable Energy Switchyards
Switchgear and combiner harnesses for solar, wind, and battery-storage interconnect facilities. Outdoor-rated jackets, UV-stable insulation, and DC-isolation-aware termination.
Industrial Power Distribution
Harnesses inside heavy-industrial switchgear for mining, oil & gas, marine power systems, and large manufacturing facilities running their own MV substation.
Power Equipment Modernization & Retrofit
Drop-in replacement cable assemblies for aging switchgear retrofit programs — same connector tail geometry, same fit-up, modernized insulation and traceability.
Engineering Challenges
Review risk before production
Arc-Flash Energy
Insulation rating, jacket choice, and calibrated crimp discipline targeting the NFPA 70E / IEC 61482-1-2 envelope your switchgear is qualified to — not a generic UL 758 floor.
Connector Tail Geometry
Matching connector tail-to-cable OD, jacket diameter, and strain-relief footprint so a modernization or retrofit assembly drops into the legacy cabinet without re-tooling.
PPAP & Traceability
First-article dimensional report, material certification, control plan, and lot traceability with crimp-tool ID to the PPAP Level 2 (or higher) submission the end customer requires.
Thermal & Voltage Margin
Conductor, insulation, and temperature-rating selection for LV (≤ 1 kV) through MV (up to 38 kV) service across -40 °C to +125 °C operating ranges.
Technical Capabilities
Technical Specifications
IPC/WHMA-A-620 workmanship and IATF 16949 process discipline for MV and LV switchgear internal cabling, with PPAP submission and full lot traceability.
Voltage ClassLV (≤ 1 kV) and MV (up to 38 kV) switchgear internal cabling
Conductor Count1-core to 10-core penetration harnesses, configurable on request
Wire ConstructionUL 1015, UL 1283 control wire, XHHW-2, MTW; MV cable via approved partner
Connector FamiliesMIL-DTL-5015 / 3108A circular aviation, Anderson Powerpole, ring-lug, fork-lug, terminal-block fan-out
Crimp ToolingCalibrated hex-crimp for HV lugs (Burndy MD6 / TE PRO-CRIMPER hex), Pro-Crimper III for signal terminals
Insulation Rating600 V, 1000 V, 2 kV, and program-specific arc-flash-aware constructions
Operating Temperature-40 °C to +90 °C standard, +105 °C / +125 °C with high-temp insulation
Workmanship StandardIPC/WHMA-A-620 Class 2 default; Class 3 available; UL 508A reference for panel-internal wiring
Quality SubmissionPPAP Level 2 standard, PPAP Level 3-5 on request
Testing100% continuity, hipot AC/DC where required, pull-force sampling, crimp-height first-article
ComplianceIPC/WHMA-A-620, UL 758, UL 508A, IATF 16949 process discipline, RoHS, REACH
DocumentationFirst-article dimensional report, material cert, control plan, lot traceability with crimp-tool ID
Manufacturing Process
From RFQ to Production
01Drawing / BOM Review
02Component Sourcing
03Cutting & Stripping
04Crimping / Assembly
05In-process Inspection
06Electrical Test
07Final Inspection
08Packaging & Shipment
Quality & Testing
Documentation for OEM review
Every switchgear harness is verified with 100% continuity, hipot AC/DC where required, pull-force sampling, and crimp-height first-article — then documented with a first-article dimensional report, material certification, control plan, and lot traceability tied to the crimp-tool ID before it ships.
Material CertificationProcess Control PlanCrimp-Height First-ArticleCrimp Pull-Force100% ContinuityHipot AC/DCFinal InspectionLot TraceabilityPPAP Submission
Why WHP
Why Switchgear OEMs Choose Us
Inside a switchgear cabinet there is no second chance — every harness has to behave under thermal stress, vibration, and possible arc-flash energy
5-Year Tier-1 Program Continuity
We carry switchgear OEM relationships across multiple PO cycles, control-plan revisions, and ECN cycles. The same engineering contact and the same operators move from program launch through year-five maintenance.
PPAP Discipline by Default
PPAP Level 2 submission ready out of the box — first-article dimensional, material cert, control plan, FMEA. Higher PPAP levels supported when the end-customer (utility, mining, oil & gas) requires it.
MIL-Connector Practice In-House
We work MIL-DTL-5015 / 3108A circular shells, MIL-spec hex-crimp lug practice, and threaded coupling discipline inside the same quality system as automotive harness work — without sending out for connector termination.
Drop-In Replacement Geometry Match
For switchgear modernization and retrofit programs, we match the connector tail-to-cable OD geometry of the legacy harness so the new assembly drops into the existing cabinet without re-tooling or panel rework.
Arc-Flash-Aware Build Plan
Insulation rating, jacket choice, and strain-relief discipline target the NFPA 70E / IEC 61482-1-2 envelope your switchgear is qualified to, not a generic floor.
Long-Run Cable + Short-Run Harness on One Floor
Multi-meter substation cable runs and short cabinet-internal harnesses are built in the same facility under the same quality system. No separate supplier for the 30-ft cable and the 12-inch jumper.
Switchgear build standards
Built to IPC/WHMA-A-620 workmanship under IATF 16949 process discipline, with UL 758 / UL 508A reference for panel-internal wiring and RoHS / REACH compliance.
IPC/WHMA-A-620Class 2/3 Workmanship
IATF 16949Process Discipline
PPAP Level 2Submission Ready
FAQ
Frequently Asked Questions
What is a switchgear cable assembly?
It is the internal control, metering, and power wiring built for the inside of a switchgear panel or control cabinet — pre-cut, stripped, and terminated conductors that land on terminal blocks, relays, meters, and busbar/breaker tie points. We build these as ready-to-install assemblies so panel builders can install a harness instead of wiring conductor-by-conductor in the field.
What terminations do you use for switchgear control wiring?
Control and secondary wiring is most commonly terminated with insulated ring-tongue or fork/spade lugs for stud terminals, and bootlace ferrules (wire-end sleeves) for screw and spring-clamp terminal blocks. Terminations are crimped with calibrated tooling to the connector manufacturer specification, and we verify crimp height and pull-force by sampling.
Can you build CT/PT and metering harnesses?
Yes. Current-transformer and potential-transformer secondary wiring and metering harnesses are a core part of switchgear cabling. CT secondary circuits are wired so they are never left open under load, using shorting-block-friendly terminations and clearly labeled conductors so the metering and protection circuits can be verified during commissioning.
What voltage and temperature ratings do you support?
We select conductor, insulation, and temperature rating for the service class of the panel — LV (up to 1 kV) through MV (up to 38 kV) — with operating ranges spanning roughly -40 °C to +125 °C depending on the insulation system chosen. The exact rating is set from your panel drawing and the insulation temperature class you specify.
How do you handle arc-flash-aware routing and separation inside the panel?
Routing follows the panel drawing and the arc-flash envelope the switchgear is qualified to, keeping control, metering, and power wiring separated, maintaining clearance and creepage, and routing away from busbar and breaker terminals. Jacket and insulation selection targets the NFPA 70E / IEC 61482 context your cabinet is rated to rather than a generic minimum.
Do you seal cable entries and glands where the panel requires it?
Yes. Where the enclosure has a sealing or ingress-protection requirement, we fit cable glands, grommets, and sealed entries so the assembly maintains the panel rating at the point of entry. Tell us the enclosure rating and entry hardware and we build the harness to land into it.
Which panel and workmanship standards do you build to?
Assemblies are built to IPC/WHMA-A-620 workmanship under IATF 16949 process discipline, with UL 758 / UL 508A reference for panel-internal wiring and RoHS / REACH material compliance. First-article dimensional report, material certification, and lot traceability are available for OEM review.
What is your minimum order quantity and lead time?
We support prototype and first-article builds for a new panel design, scaling up to recurring production volumes for panel-builder and OEM programs. Lead time depends on component availability and build complexity — send the drawing, BOM, and forecast and engineering will confirm MOQ and a lead-time window for your program.
OEM Program Entry
Spec'ing a Switchgear Harness Program?
Send the cabinet drawing, schematic, or connector callout. We will review the conductor count, insulation rating, MIL connector tail, and PPAP expectations and quote prototype + series in parallel.
We will review
- 01Design Feasibility
- 02Component Availability
- 03Cost Drivers
- 04Validation Requirements
Related Capabilities
Related Capabilities
Pages adjacent to switchgear cable assembly that pair with panel and control-cabinet builds
Representative Project
Representative project type (illustrative)
Representative project type we handle, shown for illustration. Not a specific named customer.
Industryelectric-power-switchgear
RegionGlobal
YearRecent
Scenario: An electric-power switchgear OEM runs a multi-year supply program through successive purchase orders, then opens a new custom multi-core penetration harness inquiry for a higher-value project.
Challenge: Strict PPAP / IATF expectations, exacting connector tail geometry to match the legacy switchgear cabinet, rugged aviation-style connector callouts, and tight lead-time on every order.
What we did: We lock a qualified process to the legacy connector tail geometry, run PPAP submission on any localized parts, and build the custom penetration harness as a molded body with matched connector ends per the OEM schematic.
Result: Successive orders are delivered, and the relationship expands into new custom penetration-harness work across multiple order cycles.
- Multi-year program across successive orders
- PPAP submission on localized parts
- Custom multi-core penetration harness built to OEM schematic
- Rugged aviation-style connector callouts supported