Cable structure preview Reference cable
01 Selected cable solution
THHN / THWN Wire Production Line
What is a THHN / THWN wire production line? It turns prepared copper conductors into PVC-insulated wire with a nylon covering. Form strands first when needed, then apply PVC and nylon, cool and dry the wire, inspect it and wind it to the agreed format.
- Cable designation
- THHN / THWN
- Conductor material
- Copper reference · final material to confirm
- Conductor route
- Make strands first—or start with a prepared conductor
- Final configuration
- Φ800 buncher + Φ70 / Φ50 / Φ40 extrusion; scope to confirm
02 Cable definition
Define the THHN / THWN Wire Before Selecting Equipment
The image is a construction reference only. Confirm the copper conductor, PVC insulation and nylon covering, then define component-wire diameter, strand count and the dimensions of both material layers.
Known inputs and open confirmations
- Cable family
- THHN / THWN Wire
- Reference designations
- THHN / THWN for project review; THWN-2 only where specified and qualified
- Conductor material
- Copper in this reference; an alternative conductor material requires separate review
- Conductor construction
- Solid, stranded or fine-stranded / flexible · To be confirmed
- Individual wire diameter
- To be confirmed for a multi-wire conductor
- Number of wires / strands
- To be confirmed for each conductor
- Finished bare-conductor diameter
- To be confirmed before insulation extrusion
- Nominal conductor cross-section
- To be confirmed
- Finished-product core count
- Single insulated core in this example. Strand count inside its conductor is a separate input.
- Primary insulation
- PVC insulation plus nylon covering; both compound grades to confirm
- PVC / nylon thickness and finished diameter
- Separate PVC and nylon thickness targets, tolerances and finished OD To be confirmed
- Rated voltage / final designation
- To be confirmed
- Target output / capacity
- To be confirmed
- Acceptance basis
- To be confirmed
Strand count is not the number of insulated cable cores. Specify the conductor as n × d mm: n is the number of individual wires and d is each wire’s diameter. Also confirm the finished bare-conductor diameter and nominal cross-section. Form the strands before insulation, or start with an approved ready-stranded conductor.
03 Preliminary process route
Match the Route to the Conductor Construction
This route illustrates single-core copper wire with PVC insulation and a nylon covering. Individual wires need forming; approved solid or ready-stranded conductors enter the PVC and nylon extrusion route.
Prepare wires if needed → Bunch / strand → PVC insulation / colour stripe → Nylon covering → Cool / dry → Inspect / mark → Take up Confirm n × d, lay, bare-conductor diameter and resistance. Drawing / annealing and retail coiling / packing remain separate scope if required.
Typical process / not a fixed layout Read the order, not a fixed machine spacing: conductor forming precedes PVC insulation and nylon covering. Feed, preheating and straightening are inside the extrusion package, not a separate process card. Surface drying precedes spark testing. Cooling, marking, gauges and accumulators follow the approved layout; a continuous mechanical link from buncher to extruder is not assumed.
Stage 02 / Required when forming strands
Bunching / Stranding
Form the specified individual copper wires into one bare conductor before insulation.
- Input
- Prepared copper wires: wire count × individual-wire diameter.
- Output
- One bare stranded conductor with the specified lay, diameter and resistance.
- Equipment source
- Reference equipment; model, manufacturer and supply scope to confirm
- Confirm
- The reference sheet lists 0.29–1.0 mm inlet wires and 2.5–16 mm² bunched area. Confirm the exact strand count, lay and finished bare-conductor diameter. Prepared solid or ready-stranded conductors bypass this stage.
04 Equipment by required stage
Review the Equipment Categories for This Route
Review each machine’s actual function, then confirm its model and interfaces. The Φ800 buncher and Φ70+50+40 extrusion specifications provide reference values, not a verified combined range. The 3D images are equipment-category references, not exact-model photographs.
3D equipment reference · final model and configuration to confirm 01 / Upstream / as required
Drawing & Annealing
Reduce incoming copper rod or wire to the component-wire diameter. Include annealing where required to achieve the specified conductor condition; purchased wire may already meet these inputs.
Drawing and annealing are different functions. Confirm whether an annealer is integrated or separate; this reused image identifies only the drawing-equipment category. Drawing / annealing is not included in the two supplied reference packages.
05 Manufacturing and integration
Keep Every Equipment Source and Responsibility Explicit
A coordinated production-line project does not mean one factory manufactures every machine. Each source and interface is defined in the approved proposal.
THHN / THWN Wire, one coordinated project interface
Proposal-defined scope Equipment source, contracting entity, integration boundary and service responsibility stay item-specific.
Manufactured by HONGKAI
Only equipment explicitly identified as HONGKAI-manufactured in the confirmed proposal. The supplied reference sheets do not establish that manufacturing attribution.
- Insulation extrusion equipment identified in the proposal
- Mechanical assembly and electrical-control scope only as defined for each identified item
- Factory inspection or testing only where stated in the approved proposal
Integrated from Specialist Manufacturers
The Φ800 buncher and Φ70+50+40 extrusion references are reviewed as specialist equipment. Confirm the source, model, inspection and contractual scope item by item; drawing or annealing is separate upstream scope if required.
- Φ800 bunching matched to individual-wire diameter, strand count and finished conductor diameter
- Drawing / annealing equipment only when required by the confirmed incoming wire
- Φ70 PVC insulation, Φ50 colour striping and Φ40 nylon covering with confirmed interfaces
- Source and contractual boundary stated in the proposal
Supporting Equipment and Project Interfaces
Cooling and drying, separate diameter and spark instruments, laser marking, capstan, accumulators and shaftless take-up. Retail coiling or packing requires a separate scope.
- Exact functions and equipment source remain project-specific
- Customer-side utilities and interface responsibilities
- Installation, commissioning and training scope if agreed
06 Factory planning inputs
Plan the Factory Around the Confirmed Line Scope
Select only the information you already have. This checklist records readiness for review and does not save or submit project data.
07 Quality checkpoints
Check the Conductor, Insulation and Finished Wire
Agree the inspection plan before equipment selection. These 3D references explain the checks; they are not factory photographs, customer cases or evidence of passed tests.
Conductor acceptanceConductor acceptance
Check the Bare Conductor
Confirm wire count, individual-wire diameter, lay, finished bare-conductor diameter and the specified conductor resistance.
Wire count inside one conductor is not the number of insulated cores. The 3D cable is a structure illustration, not a test sample.
Dimensional controlDimensional control
Measure Diameter; Verify the Wall
Monitor outside diameter during production. Verify PVC and nylon thicknesses separately, including minimum wall and eccentricity where required by the product specification.
A laser outside-diameter gauge alone cannot establish minimum wall thickness. The acceptance method and tolerances must be defined.
In-line electrical checkIn-line electrical check
Inspect the Dry Insulation
Dry the wire after cooling, apply the approved spark-test method and record or mark detected faults as specified.
Test type, voltage and response are product-specific. In-line spark testing is not a complete cable-certification test.
Finished-product releaseFinished-product release
Confirm the Sale-Ready Package
Check the agreed length, marking, winding and packing, plus the finished-wire electrical, dimensional and material tests required by the product specification.
The handling image is not an automatic packing-package claim. THHN / THWN qualification, test records and FAT/SAT evidence require actual project data.
Keep illustration and evidence separate. Add actual trial records, sample measurements and project acceptance documents once available. No performance or certification is inferred from a render.
Project records required 08 FAQ
Clarify the Route Before Requesting a Quote
These answers explain the decision path. They do not replace an approved cable design, technical solution, quotation or project proposal.
What equipment is included in the preliminary THHN / THWN Wire route?
The two references cover a Φ800 buncher and a Φ70+50+40 extrusion package. The extrusion list includes conductor entry and preheating, PVC insulation with optional colour striping, nylon covering, cooling and drying, diameter measurement, laser marking, spark testing, capstan, accumulators and shaftless take-up. Drawing / annealing and retail coiling / packing need separate scope confirmation.
Are drawing, annealing and bunching always required?
No. Approved solid and ready-stranded conductors bypass bunching. Individual wires must be formed before insulation. Drawing or annealing is upstream scope only where incoming size or condition requires it, and is not included in the two supplied packages. Confirm n × d, conductor class, lay, bare OD and resistance.
What do the Φ70, Φ50 and Φ40 extruders do?
The Φ70 extruder provides the main PVC insulation. The Φ50 vertical unit provides the optional colour stripe. The separate Φ40 extruder applies nylon covering over the PVC-insulated conductor. These are not three interchangeable material layers.
What insulation materials can the line process?
This page reviews PVC insulation plus a nylon covering, using approved grades and tooling. Confirm both layer thicknesses, processing windows and nylon drying requirements. Other materials require a separate process review. A machine specification does not establish finished-wire THHN / THWN or THWN-2 qualification.
Can one line cover several conductor sizes?
Confirm the complete operating range before quotation. The buncher reference lists 2.5–16 mm² while the conductor preheater lists 0.3–3 mm OD. Check the actual bare-conductor diameter against every interface. The capstan’s 500 m/min maximum and individual extruder output ratings are not promised finished-wire production figures.
What testing and coiling equipment is included?
Diameter measurement, laser marking, length counting and a spark tester are listed as separate functions. Dry the wire before spark testing and agree the method and voltage. The listed Φ800–1000 shaftless take-up collects reels; retail coiling, cutting, tying and wrapping are separate scope. Finished-wire qualification requires the applicable product tests.
What information is required before quotation?
Provide the required designation, AWG or mm², conductor construction, n × d, finished bare-conductor diameter, PVC and nylon grades and thicknesses, finished OD, colour / stripe, target output, incoming and finished reels, factory conditions and acceptance requirements. Unknown values may remain To be confirmed.
Does HONGKAI provide installation and training?
Installation, commissioning and training are proposal-defined services. Scope, equipment source, responsibilities, site readiness, schedule and exclusions must be confirmed for the project.
09 THHN / THWN Wire project enquiry
Plan Your THHN / THWN Wire Production Line
Share the conductor, PVC insulation and nylon covering you need to produce. Send the inputs you know; leave the rest open for technical review.
Route currently on this page
- Cable familyTHHN / THWN Wire
- Current route reviewPrepare wires if needed → Bunch / strand → PVC insulation / colour stripe → Nylon covering → Cool / dry → Inspect / mark → Take up
- Conductor inputsStrand count n × individual-wire diameter d, bare-conductor diameter and nominal cross-section
- Finished core countOne insulated core with PVC and nylon layers. Copper strand count is a different parameter.
Optional. Review the copied context before sending.
An enquiry requests a project-scope review. It does not confirm equipment configuration, material compatibility, price, delivery schedule, output, factory acceptance or project result.
Compare all cable solutionsTHHN / THWN Wire Project Enquiry
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