An electrical wire type chart is useful only when it connects material names to real cable assembly decisions. PVC, XLPE, PTFE, silicone, TPE, PUR, LSZH, shielded cable, coaxial cable, and high-flex wire can all be technically correct, but only one combination will match the route, connector, termination, current, voltage, bend radius, and operating environment.
For a production harness, wire selection is not a catalogue exercise. The drawing must define conductor size, strand class, insulation diameter, jacket compound, shielding, colour, marking, and acceptance tests. International references such as the International Electrotechnical Commission and workmanship frameworks such as IPC standards explain why conductor construction and workmanship controls belong in the same specification. The practical goal is simple: avoid a wire that passes the bench test but fails after heat, vibration, moisture, or service handling.
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Electrical Wire Types Chart
Use this chart as a first-pass filter. Final selection still depends on the connector datasheet, crimp barrel range, installation standard, cable bend radius, and the test plan required by your product risk level.
| Wire type | Typical rating | Strength | Watch-out | Best fit |
|---|---|---|---|---|
| PVC insulated hook-up wire | 80 to 105 degrees C | Low cost, easy colours, good indoor handling | Poor UV and limited high-temperature margin | Control panels, indoor equipment, simple harnesses |
| XLPE insulated wire | 90 to 125 degrees C | Better electrical and heat performance than PVC | Stiffer than PVC and less forgiving in tight routing | Automotive, energy, industrial power branches |
| Silicone wire | -60 to 200 degrees C | Excellent flexibility across hot and cold conditions | Lower abrasion resistance and higher material cost | Medical leads, engine areas, heat cycling |
| PTFE or FEP wire | 200 to 260 degrees C | Chemical resistance, thin wall, high dielectric strength | Stiff, slippery, and more difficult to strip consistently | Aerospace, defence, high-temperature sensors |
| TPE or TPU jacketed cable | -40 to 125 degrees C | High flex life, soft touch, good abrasion options | Compound-dependent oil and sterilisation resistance | Robotics, handheld devices, medical cables |
| PUR jacketed cable | -40 to 90 degrees C | Strong abrasion, oil, and cut resistance | Can be less heat tolerant than silicone or PTFE | Automation, mining equipment, industrial sensors |
| LSZH cable | Often 70 to 105 degrees C | Low smoke and low halogen fire performance | Not automatically oil or high-flex rated | Rail, public infrastructure, enclosed spaces |
| Shielded multicore cable | Material dependent | EMI control and predictable signal routing | Shield termination can erase performance if done poorly | CAN bus, instrumentation, encoder leads |
| Coaxial cable | Material and RF grade dependent | Controlled impedance for RF and high-speed signals | Minimum bend radius and connector prep are critical | Antennas, GPS, RF modules, test leads |
Temperature ratings are typical ranges, not a substitute for the exact wire datasheet and approval file.
“The fastest way to narrow a wire type is to write down three numbers: maximum conductor temperature, minimum bend radius, and circuit voltage. If one of those is missing, the material choice is still guesswork.”
Insulation and Jacket Choices
PVC
PVC is the default for cost-sensitive indoor assemblies. It is available in many colours and diameters, strips cleanly, and works well in basic equipment. Avoid using commodity PVC where UV, oil, 125 degrees C heat, or repeated flexing dominates the failure risk.
XLPE
Cross-linked polyethylene improves heat deformation, dielectric strength, and ageing compared with standard PVC. It is common in automotive, power, and outdoor branches where the assembly needs a stronger electrical insulation system without jumping to PTFE cost.
Silicone
Silicone is chosen for hot and cold flexibility. It remains supple where PVC stiffens, making it useful for medical leads, heated equipment, and engine-adjacent routing. Protect it from abrasion with sleeving or routing discipline.
PTFE, FEP, and ETFE
Fluoropolymer wires handle high temperature, chemical exposure, and thin-wall designs. They require disciplined stripping and termination because nicked conductors, poor crimp compression, or insulation pullback can defeat the premium material choice.
TPE, TPU, and PUR
These compounds are often selected for moving cables, soft-touch leads, robotic dress packs, or industrial sensor assemblies. The exact formulation matters: oil resistance, sterilisation compatibility, and flex life can vary significantly.
LSZH
Low-smoke zero-halogen cable is selected around fire and evacuation risk, especially rail and infrastructure. Treat LSZH as a fire-performance requirement first, then separately verify flex, chemical, UV, and temperature ratings.
If you are comparing only PVC, silicone, and XLPE, our deeper silicone vs PVC vs XLPE cable guide expands the temperature and cost trade-offs. For hot zones above 150 degrees C, use the high-temperature wire selection guide before approving the BOM.
Conductor Construction
The conductor decision is usually more important than the colour of the jacket. Solid conductors hold shape and suit protected static routes, but they are rarely the best choice for crimped harnesses. Standard stranded wire improves vibration tolerance. Fine-stranded and extra-flex constructions spread bending stress across many smaller strands, which improves life in service loops, handheld leads, and moving machine axes.
Practical conductor rule
If the assembly includes crimp terminals, sealed connectors, field service, routing clips, or vibration, start with stranded copper. Then choose standard, fine, or high-flex stranding based on bend cycles and minimum bend radius.
Conductive material also matters. Bare copper is economical, tinned copper resists oxidation and solders more consistently, silver-plated copper supports high temperature and RF applications, and nickel-plated copper is used where the insulation and temperature class demand it. For AWG and metric sizing, use the wire gauge selection guide and verify voltage drop over the full round-trip path.
“A 24 AWG wire can be perfectly sized electrically and still be wrong mechanically. If the terminal barrel is not qualified for that insulation diameter and strand class, pull force and crimp height will drift in production.”
Shielded and Coaxial Cable
Shielded cable is a wire type decision, not an accessory added at the end. Foil shields provide near 100 percent coverage and are common for high-frequency noise control. Braided shields add mechanical strength and better handling where the cable moves or where low-frequency interference is present. Combination foil-braid shields are used when EMC risk and durability both matter.
Coaxial cable is different because impedance, dielectric geometry, braid coverage, connector launch, and bend radius all affect signal quality. A generic insulated wire cannot replace coax in RF paths, GPS antennas, telemetry links, or test leads. If your design uses RF connectors, pair this chart with our RF connector types guide and service pages for SMA cable assemblies or RG214 cable assemblies.
Do not specify shielded cable without defining the termination method. A shield connected through a long pigtail can perform poorly compared with a simpler braid terminated 360 degrees at the connector shell.
Selection Framework for Production Harnesses
1. Define the electrical load
Set current, voltage, duty cycle, allowable voltage drop, and safety margin. Confirm whether the circuit is power, signal, RF, sensor, or mixed-use.
2. Map the environment
List ambient temperature, conductor temperature, oil, coolant, UV, water, abrasion, sterilisation, flame, and chemical exposure.
3. Choose conductor construction
Select solid, stranded, fine-stranded, or high-flex based on vibration and bend cycles. Lock the AWG or metric area and strand class.
4. Match the termination system
Verify that the crimp terminal, solder cup, insulation displacement contact, or connector seal accepts the wire OD and conductor class.
5. Specify protection and marking
Add sleeving, heat shrink, labels, colour coding, or overmolding only after confirming bend radius and serviceability.
6. Lock the validation plan
Define continuity, polarity, insulation resistance, hi-pot, shield continuity, pull force, dimensional, and flex tests by risk level.
“Wire type substitutions need a control plan. Changing PVC to TPE may improve flex life, but it can also change strip length, seal compression, crimp height, and connector retention by fractions of a millimetre.”
Testing Requirements by Wire Type
Different wire types create different quality risks. High-flex cable needs bend testing or a validated flex-life history. Shielded cable needs shield continuity and termination inspection. High-voltage branches need insulation resistance and dielectric withstand checks. Medical, rail, and defence harnesses typically need stronger traceability, material declarations, and documented workmanship criteria.
Standard low-voltage harness
- 100 percent continuity
- Polarity and pinout
- Visual workmanship
- Pull-force sampling
High-voltage or safety circuit
- Continuity
- Insulation resistance
- Hi-pot test
- Creepage and clearance review
Shielded or RF cable
- Shield continuity
- Connector orientation
- Insertion or return loss when required
- Bend radius inspection
The RoHS directive is also relevant when material declarations are required for export equipment. For workmanship and inspection depth, see our IPC/WHMA-A-620 wire harness standard guide.
FAQ
What is the best general-purpose wire type for cable assemblies?
For general indoor harnesses, stranded tinned copper with PVC insulation rated 80 to 105 degrees C is usually the most economical starting point. For moving equipment, outdoor exposure, or washdown areas, upgrade to PUR, TPE, XLPE, or silicone depending on the temperature, flex, oil, and UV requirements.
Which electrical wire type is best for high temperature?
For continuous 200 degrees C operation, silicone and PTFE are the common choices. Silicone gives excellent flexibility from about -60 to 200 degrees C, while PTFE can reach about 260 degrees C but is stiffer and more difficult to process in tight harness routes.
When should I use shielded wire in a harness?
Use shielded wire when signal circuits run near motors, inverters, solenoids, radio transmitters, or long cable paths. For many industrial and CAN bus assemblies, foil plus drain wire is adequate above 100 MHz, while braid or foil-braid combinations are preferred when mechanical durability and low-frequency noise performance matter.
Is solid wire acceptable in a custom wire harness?
Solid wire is acceptable only for static, protected routes and terminations approved for solid conductors. Most crimped harnesses use stranded wire because vibration, service loops, and connector strain relief usually require Class 5 or Class 6 style flexibility under IEC 60228 concepts.
How do I choose between PVC, XLPE, TPE, PUR, silicone, and PTFE?
Start with the exposure profile: PVC for controlled indoor use, XLPE for better heat and electrical performance up to about 90 to 125 degrees C, TPE or PUR for flex and abrasion, silicone for -60 to 200 degrees C flexibility, and PTFE for chemical resistance and high temperature up to about 260 degrees C.
What tests should be specified for different wire types?
At minimum, every cable assembly should receive 100 percent continuity and polarity testing. Add insulation resistance and hi-pot testing for circuits above 50 V, shield continuity for screened cable, pull-force checks for crimped terminals, and bend or flex testing when the cable sees repeated motion.
Specify the wire type before the build risk appears
Custom Wire Assembly can review conductor size, insulation, shielding, connector compatibility, and production testing for prototype or repeat-supply harnesses. Send your drawing, sample, or application notes and we will help turn the wire type chart into a manufacturable specification.