T90 Nylon Wire Guide: CSA Ratings, Construction, Applications and Buyer Checks

T90 nylon wire coils with copper conductors for CSA building wiring applications

T90 nylon wire is widely used in Canadian residential, commercial, and industrial building-wiring projects. It is compact, easy to pull through raceways, available in common AWG sizes and colors, and frequently manufactured with both Canadian and US wire designations.

However, the words T90, TWN75, THHN, and THWN-2 should not be treated as interchangeable product names.

Two wires may both have copper conductors, PVC insulation, and nylon coverings, yet carry different temperature, location, flame-test, certification, and installation permissions. For distributors, contractors, importers, and project buyers, the complete cable marking and certification record are therefore more important than appearance alone.

This guide explains:

  • What T90 nylon wire is
  • CSA T90 wire ratings
  • Copper, PVC, and nylon construction
  • Dry- and wet-location limitations
  • Common T90 building wire applications
  • T90 vs THHN and THWN-2
  • Differences between T90, TWN75, RW90, and NMD90
  • Certification and factory-testing requirements
  • A practical T90 cable purchasing checklist

Quick Answer: What Is T90 Nylon Wire?

T90 nylon wire is a single-conductor thermoplastic building wire commonly rated 600V and designed for a maximum conductor temperature of 90°C in dry locations.

A typical construction consists of:

  1. Solid or stranded annealed copper conductor
  2. Flame-retardant PVC insulation
  3. Thin polyamide, commonly called nylon, outer covering

T90 nylon wire is commonly manufactured according to CSA C22.2 No. 75, the Canadian standard for thermoplastic-insulated wires and cables.

A typical product may also carry additional designations such as:

  • TWN75
  • THHN
  • THWN
  • THWN-2
  • MTW
  • FT1
  • VW-1
  • Oil Resistant
  • CT Use

These additional ratings are not automatic. They apply only when they appear in the approved product marking and are covered by the manufacturer’s certification record.

ItemTypical T90 Nylon Wire Specification
Product typeSingle-conductor building wire
ConductorSolid or stranded annealed copper
InsulationThermoplastic PVC
Outer coveringPolyamide or nylon
Rated voltageCommonly 600V
Dry-location temperature90°C
Wet-location ratingNot established by T90 alone
Common Canadian standardCSA C22.2 No. 75
Common flame markingFT1, when certified and marked
InstallationRaceway, conduit, or other permitted building-wiring methods
Direct burialNot assumed
Sunlight resistanceNot assumed unless specifically marked
Common US comparisonTHHN or multi-rated THHN/THWN-2

What Does “T90 Nylon” Mean?

The designation can be understood in three parts.

T: Thermoplastic Insulation

The letter T identifies a thermoplastic-insulated conductor. In most commercial T90 nylon wire products, the main electrical insulation is PVC.

Thermoplastic material softens when heated and hardens again when cooled. Its formulation must be controlled carefully because insulation performance depends on more than nominal thickness.

Buyers should also check:

  • Tensile strength
  • Elongation
  • Heat aging
  • Cold bending
  • Deformation resistance
  • Flame performance
  • Electrical insulation properties

90: Maximum Conductor Temperature

The number 90 refers to a maximum conductor operating temperature of 90°C under the conditions covered by the T90 designation—normally dry locations.

It does not mean:

  • The wire carries 90 amps
  • The surrounding room may continuously remain at 90°C
  • Every terminal can operate at 90°C
  • The 90°C ampacity column can always be used
  • The wire is automatically rated 90°C in wet locations

Final conductor loading must follow the applicable electrical code, termination ratings, installation method, ambient temperature and adjustment factors.

Nylon: Protective Outer Covering

The nylon layer is a thin protective covering applied over the PVC insulation.

It can help provide:

  • Better abrasion resistance during pulling
  • A smoother surface for raceway installation
  • Protection against minor handling damage
  • Reduced insulation scuffing
  • Improved resistance to certain oils, greases and chemicals when tested and marked

Nylon is not armour and should not be treated as a substitute for conduit, metallic covering, an overall cable sheath or mechanical protection.

It also does not automatically make the wire waterproof, sunlight-resistant, direct-burial-rated or suitable for every chemical environment.


T90 Nylon Wire Construction

Close-up of T90 wire showing stranded copper conductor PVC insulation and thin nylon covering

Although T90 building wire has a simple appearance, its performance depends on the control of all three construction layers.

1. Copper Conductor

T90 nylon wire normally uses an annealed copper conductor.

Depending on the size and product design, the conductor may be:

  • Solid copper
  • Concentric stranded copper
  • Compressed stranded copper
  • Combination unilay-stranded copper

Solid conductors are economical and retain their shape, while stranded conductors are generally easier to pull and route in larger sizes or routes with multiple bends.

When reviewing a quotation, buyers should confirm:

  • Copper conductor rather than copper-clad aluminium
  • Solid or stranded construction
  • AWG or kcmil size
  • Number of strands
  • Individual strand diameter
  • Conductor diameter
  • Maximum DC resistance
  • Copper surface condition
  • Required conductor standards

Conductor weight alone should not be used as the only quality test. Electrical resistance, conductor dimensions and strand construction should be evaluated together.

2. PVC Insulation

PVC provides the primary electrical insulation.

Its functions include:

  • Separating the energized conductor from surrounding materials
  • Providing dielectric strength
  • Supporting the product’s temperature rating
  • Providing the base color for circuit identification
  • Contributing to flame and mechanical performance

Common insulation colors include:

  • Black
  • White
  • Red
  • Blue
  • Green
  • Yellow
  • Orange
  • Brown
  • Grey
  • Violet

Color availability and conductor identification should be confirmed before production. Do not assume that every color or size is included in a supplier’s certification range.

3. Nylon Outer Covering

The nylon covering is much thinner than the PVC insulation. It must be applied evenly without exposed PVC, excessive eccentricity, bubbles, cracking or surface contamination.

During inspection, check for:

  • Continuous nylon coverage
  • Consistent outside diameter
  • Smooth surface
  • No cuts or pinholes
  • No exposed insulation
  • No excessive sticking between layers
  • No color contamination
  • No obvious eccentricity
  • Clear and durable printing

The nylon covering should protect the PVC during normal handling and pulling, but the wire must still be installed using appropriate pulling equipment, lubricant, bend radius and tension controls.


CSA T90 Wire Ratings Explained

CSA C22.2 No. 75

CSA C22.2 No. 75 covers thermoplastic-insulated wires and cables. It addresses construction, materials, marking and required performance tests for relevant wire types.

For a product sold as CSA T90 wire, buyers should verify that:

  • The manufacturer is included in the certification record
  • The actual production factory is covered
  • T90 Nylon is included in the approved product category
  • The required conductor sizes are covered
  • Copper conductor construction is covered
  • The 600V rating is covered
  • The requested flame rating is covered
  • Additional designations are included where required
  • The certification status is current

A PDF certificate or logo on a quotation is not sufficient by itself. The certificate holder, manufacturing site, product category and approved ratings should all match the proposed wire.

600V Voltage Rating

T90 nylon wire is commonly rated 600 volts.

This does not mean it is suitable for every circuit below 600V. The installation must also match:

  • The applicable Canadian Electrical Code requirements
  • Provincial or local regulations
  • Equipment voltage
  • Wiring method
  • Overcurrent protection
  • Grounding and bonding design
  • Environmental conditions
  • Terminal and connector approvals

The voltage marking must be visible on the finished product or appear as required by the governing certification and marking rules.

90°C Dry-Location Rating

T90 normally identifies a maximum conductor temperature of 90°C in dry locations.

The 90°C insulation rating can be useful when applying code-permitted correction or adjustment calculations. However, it does not override the temperature limitations of:

  • Terminals
  • Breakers
  • Switchgear
  • Connectors
  • Lugs
  • Enclosures
  • Connected equipment

A circuit may still need to be sized using a lower temperature column even when the conductor insulation is rated 90°C.

Wet-Location Rating

One of the most common purchasing mistakes is assuming every T90 nylon wire is automatically wet-rated.

T90 alone should not be used as proof of a wet-location rating.

A multi-rated Canadian product may also carry TWN75, indicating suitability for wet or dry locations at a maximum conductor temperature of 75°C, subject to its certification and installation rules.

If the project involves:

  • Underground conduit
  • Outdoor raceways
  • Washdown areas
  • Condensation
  • Mechanical rooms
  • Damp basements
  • Water-treatment buildings
  • Other locations where moisture may enter the raceway

the buyer should specify the required wet-location designation instead of ordering only “T90 cable.”

FT1 Flame Rating

FT1 is a common flame-test marking on Canadian T90 building wire.

However, buyers should not confuse:

  • FT1
  • FT4
  • VW-1
  • LSZH
  • Fire-resistant cable
  • Circuit-integrity cable

These terms represent different tests and performance objectives.

A wire marked FT1 should not be advertised as FT4, low-smoke zero-halogen or fire-resistant unless those claims are independently covered by the applicable construction, testing and certification.

Sunlight and Outdoor Exposure

Standard T90/TWN75 products are not automatically sunlight-resistant.

The nylon covering may improve abrasion performance, but it does not prove long-term resistance to:

  • Ultraviolet radiation
  • Rain
  • Snow
  • Standing water
  • Outdoor temperature cycling
  • Direct weather exposure

For outdoor use, buyers should check for an explicit sunlight-resistant or outdoor-use marking and confirm that the entire installation method is permitted.

Oil and Chemical Exposure

Some multi-rated PVC/nylon wires include oil- or gasoline-resistance markings. The permitted temperature may be lower under those exposure conditions.

Do not approve a wire for an industrial environment solely because it has a nylon covering. Request the exact test designation, temperature limit and certification scope.


How Is T90 Wire Ampacity Determined?

The name T90 does not determine ampacity by itself.

Correct conductor sizing should consider:

  1. Design load current
  2. Continuous and non-continuous loading
  3. Conductor size and material
  4. Wiring method
  5. Number of current-carrying conductors
  6. Ambient temperature
  7. Terminal temperature rating
  8. Overcurrent-protection requirements
  9. Voltage drop
  10. Harmonic loading where relevant
  11. Motor starting or equipment inrush current
  12. Local electrical-code requirements

For example, a 90°C conductor may be used in an adjustment calculation while the final allowable load is still limited by 75°C-rated equipment terminals.

Buyers should therefore avoid publishing an ampacity table without stating:

  • Applicable code edition
  • Copper or aluminium conductor
  • Installation method
  • Number of loaded conductors
  • Ambient temperature
  • Terminal rating
  • Required correction factors

The final cable size should be selected or approved by the responsible electrical professional.


Common T90 Building Wire Applications

When correctly specified and installed, T90 nylon wire can be used in many building-wiring systems.

Common applications include:

  • Residential branch circuits in approved raceways
  • Commercial lighting circuits
  • Commercial power circuits
  • Feeder circuits
  • Panelboard wiring
  • Electrical distribution inside buildings
  • Conduit wiring in offices and retail buildings
  • Industrial building wiring
  • Fixture wiring where specifically permitted
  • Equipment connections where the additional required designation is present

T90 is especially useful when projects need individually colored conductors pulled through conduit.

Because it is a single conductor, the installer can select the required:

  • Phase colors
  • Neutral color
  • Bonding or grounding color
  • Conductor sizes
  • Circuit quantities
  • Raceway layout

For Canadian residential projects that require a complete sheathed cable assembly rather than individual conductors, compare the product with our NMD90 vs T90 cable guide.


Where Should T90 Nylon Wire Not Be Used?

Unless the specific product carries the required additional approval, standard T90 nylon wire should not be assumed suitable for:

  • Direct burial
  • Continuous water immersion
  • Unprotected outdoor sunlight exposure
  • Wet locations based only on the T90 marking
  • Cable trays without a tray-use rating
  • Flexible cord applications
  • Portable equipment cords
  • Areas exposed to severe mechanical damage
  • High-temperature applications above the certified limit
  • Hazardous locations without the required wiring method
  • Fire-alarm or life-safety circuits requiring special fire performance
  • Solar-array wiring
  • Medium-voltage installations
  • Marine or mining applications requiring separate standards

An ordinary PVC/nylon building wire is not a substitute for PV wire, armoured cable, flexible cord, tray cable or direct-burial cable.


T90 vs THHN: Are They the Same Wire?

T90 and THHN often use similar physical construction:

  • Copper conductor
  • PVC insulation
  • Nylon outer covering
  • Common 600V rating
  • Common 90°C dry-location rating

But they are not automatically the same certified product.

ComparisonT90 NylonTHHN
Primary market designationCanadaUnited States
Common standardCSA C22.2 No. 75UL 83
Typical constructionCopper/PVC/nylonCopper/PVC/nylon
Typical voltage600V600V
Dry-location rating90°C90°C
Wet-location ratingNot established by T90 aloneNot established by THHN alone
Common wet companion ratingTWN75THWN or THWN-2
Certification markCanadian certification requiredUL certification required for US projects
Automatic interchangeabilityNoNo

The key difference is regulatory approval and marking rather than appearance.

A manufacturer may produce one construction that is certified and marked as:

  • T90 Nylon
  • TWN75
  • THHN
  • THWN-2
  • MTW
  • AWM

When all relevant designations are supported, the same physical wire may be supplied to multiple markets. But the buyer must verify every designation rather than assuming that “THHN style” means CSA T90 certified.

For additional US-market details, see our UL 83 THHN/THWN-2 wire guide and THHN vs THWN-2 comparison.


T90 vs THWN-2

THWN-2 is commonly associated with a 90°C wet- and dry-location rating under the applicable UL product certification.

T90, by itself, normally indicates 90°C dry-location use. Canadian wet-location capability may instead be identified by a designation such as TWN75.

Therefore, a request for:

12 AWG T90 nylon wire

does not provide the same information as:

12 AWG copper T90 Nylon/TWN75, 600V, FT1, CSA certified

or:

12 AWG copper THHN/THWN-2, 600V, UL listed

The second and third descriptions identify additional ratings that may be critical to the destination market and installation environment.


T90 vs TWN75 vs RW90 vs NMD90

Wire TypeGeneral ConstructionMain Distinction
T90 NylonSingle copper conductor, PVC insulation and nylon covering90°C thermoplastic building wire for permitted dry-location applications
TWN75Usually PVC/nylon single conductorWet- and dry-location rating up to 75°C when certified
RW90Thermoset-insulated single conductorCommonly selected where wet-location or different environmental performance is required
R90Thermoset-insulated single conductorDry-location thermoset wire; exact application depends on listing
NMD90Multiple insulated conductors and bonding conductor inside an overall non-metallic sheathComplete cable assembly for permitted Canadian residential and commercial wiring
THHN/THWN-2US-market PVC/nylon single conductorUL 83 multi-rated wire for dry and wet applications as marked

Do not select between these products based only on temperature.

The decision should consider:

  • Country and inspection authority
  • Dry, damp or wet environment
  • Conduit or cable assembly
  • Indoor or outdoor exposure
  • Required mechanical protection
  • Conductor temperature
  • Terminal ratings
  • Flame requirements
  • Certification system
  • Installation temperature
  • Product marking
  • Cost and installation labor

How to Read a T90 Wire Marking

Technician checking T90 nylon wire markings conductor size and electrical resistance

A product marking may contain information such as:

MANUFACTURER — 12 AWG CU — T90 NYLON — 600 V — FT1 — CERTIFICATION MARK — FILE OR TRACEABILITY INFORMATION

A multi-rated wire may contain additional wording such as:

T90 NYLON OR TWN75 — THHN OR THWN-2 — 600 V — FT1/VW-1

This is only an example format. The actual legend must match the approved certification and marking requirements.

Before approving the artwork, confirm:

  • Manufacturer or approved private brand
  • Production factory
  • Conductor size
  • Copper designation
  • T90 Nylon designation
  • TWN75 designation if required
  • THHN/THWN-2 designation if required
  • Voltage rating
  • Temperature information
  • Flame-test marking
  • Oil or sunlight rating when applicable
  • Certification symbol
  • Traceability code
  • Sequential length marking if ordered

Our cable jacket markings guide explains how to verify size, voltage, temperature, standards and certification information before shipment.


T90 Nylon Wire Buyer Checklist

1. Confirm the Destination Market

Start with the installation country and province.

Ask:

  • Is the project in Canada?
  • Which electrical-code edition applies?
  • Which certification marks are accepted?
  • Does the project specification require CSA certification specifically?
  • Will a local electrical inspector review the product?
  • Is private-label certification required?

A certificate issued for another country does not automatically approve the product for Canada.

2. Specify the Complete Wire Designation

Do not write only “T90 cable” on the purchase order.

Specify whether you require:

  • T90 Nylon
  • T90 Nylon/TWN75
  • T90 Nylon plus THHN/THWN-2
  • MTW or AWM marking
  • FT1
  • Oil resistance
  • Sunlight resistance
  • CT Use
  • Lead-free or RoHS-related requirements

Only request additional markings that are genuinely covered by the certification.

3. Confirm Conductor Material and Size

The purchase specification should state:

  • Annealed copper conductor
  • Solid or stranded
  • AWG or kcmil size
  • Number of strands
  • Nominal conductor diameter
  • Maximum DC resistance
  • Bare or tinned copper, if relevant

Do not accept a change from copper to copper-clad aluminium or aluminium unless the entire specification, certification and project approval are revised.

4. Check Insulation and Nylon Dimensions

Request a dimensional table showing:

  • Conductor diameter
  • PVC insulation thickness
  • Minimum insulation thickness
  • Nylon thickness
  • Finished outside diameter
  • Approximate cable weight
  • Production tolerances

A thicker-looking wire is not automatically better. Excessive outside diameter can reduce conduit-fill capacity and make pulling more difficult.

5. Verify Electrical Performance

Depending on the standard and inspection plan, testing may include:

  • Conductor DC resistance
  • Voltage withstand
  • Spark testing during production
  • Insulation resistance
  • Dimensional inspection
  • Continuity
  • Conductor-size verification

The routine test report should identify the actual batch, size, color, production date and order number.

6. Verify Mechanical and Material Performance

Certification or qualification testing may cover:

  • Tensile strength
  • Elongation
  • Heat aging
  • Cold bending
  • Deformation
  • Nylon adhesion or coverage
  • Flame performance
  • Oil resistance
  • Other construction-specific tests

Not every type test needs to be repeated on every production batch. However, buyers should confirm that the approved construction and compounds are being used consistently.

7. Check the Certification Record

Compare the certification record with:

  • Company name
  • Factory address
  • Product category
  • Wire type
  • Voltage rating
  • Conductor range
  • Flame rating
  • Additional designations
  • Current certification status

Be cautious when a supplier provides a certificate belonging to another manufacturer without explaining the authorized production and branding relationship.

8. Approve the Cable Marking

Request a complete marking artwork before production.

The approval should check:

  • Spelling
  • Wire designation
  • AWG size
  • Voltage
  • Certification symbol
  • File or traceability information
  • Flame rating
  • Printing interval
  • Ink durability
  • Length marking
  • Customer brand where authorized

9. Confirm Packaging

T90 building wire may be supplied in:

  • Coils
  • Reels
  • Spools
  • Large wooden drums
  • Pull boxes
  • Customer-branded cartons

Confirm:

  • Length per package
  • Permitted length tolerance
  • Reel dimensions
  • Gross and net weight
  • Pallet quantity
  • Label design
  • Moisture protection
  • Export packing
  • Barcode requirements
  • Batch identification

10. Require Batch Traceability

Each coil, reel or drum should be traceable to production and inspection records.

Useful traceability information includes:

  • Purchase-order number
  • Product code
  • Wire size
  • Color
  • Length
  • Batch number
  • Production date
  • Inspection status
  • Reel or package number

For broader supplier qualification, review our guide to choosing a cable manufacturer in China.


Sample T90 Wire RFQ Specification

Importers can use the following format when requesting a quotation:

Product: T90 Nylon building wire
Destination market: Canada
Standard: CSA C22.2 No. 75, project-required edition
Certification: Valid Canadian product certification required
Additional designation: TWN75 if wet-location use is required
Voltage rating: 600V
Conductor: Annealed copper
Construction: Solid or stranded, specify by size
Sizes: List required AWG or kcmil sizes
Colors: List quantity by color
Insulation: Flame-retardant PVC
Outer covering: Nylon/polyamide
Flame rating: FT1 or project-specified rating
Sunlight resistance: Specify if required and certified
Oil resistance: Specify exact required designation
Marking: Submit complete print legend for approval
Packing: Coil, reel, pull box or drum
Length: Specify length per package
Testing: Conductor resistance, dimensions, voltage and applicable routine tests
Documents: Datasheet, certification record, batch test report, certificate of conformity and packing list
Inspection: Pre-shipment inspection required
Quantity: State quantity by size and color
Delivery terms: State destination, Incoterm and required delivery date

This format reduces the risk of receiving a low-priced quotation based on a different certification, conductor structure, wet-location rating or packing length.


Pre-Shipment Inspection Checklist

Before releasing the shipment, check:

Product

  • Correct T90 or multi-rated designation
  • Correct conductor sizes
  • Correct colors
  • Correct voltage rating
  • Correct certification mark
  • Correct flame marking
  • Correct conductor material
  • Consistent PVC and nylon surface
  • No visible cuts, cracks or contamination

Testing

  • Conductor resistance results
  • Conductor construction
  • Insulation thickness
  • Nylon thickness
  • Finished outside diameter
  • Spark-test or voltage-test records
  • Length verification
  • Marking durability
  • Batch identification

Documentation

  • Current certification information
  • Approved datasheet
  • Purchase-order specification
  • Marking artwork
  • Batch test report
  • Certificate of conformity
  • Packing list
  • Commercial invoice
  • Reel or package schedule

Packaging

  • Correct length per reel or coil
  • Correct label
  • Protected cable ends
  • No damaged reels
  • Suitable export pallets
  • Moisture protection
  • Readable package numbers
  • Matching batch and packing records

Common T90 Cable Buying Mistakes

Mistake 1: Ordering Only “600V Nylon Wire”

This description does not confirm T90 certification, temperature rating, conductor material, flame performance or wet-location approval.

Mistake 2: Assuming T90 Means Wet-Rated

T90 alone should not be used as evidence of wet-location suitability. Check for TWN75 or another required designation.

Mistake 3: Treating THHN and T90 as Automatically Interchangeable

They may have similar construction but serve different certification systems. Dual certification must be verified.

Mistake 4: Selecting Ampacity Only from the 90°C Rating

The final circuit rating may be limited by terminals, installation conditions or code rules.

Mistake 5: Assuming Nylon Makes the Wire Outdoor-Rated

Nylon provides a protective covering but does not automatically establish sunlight, weather or direct-burial resistance.

Mistake 6: Checking Only the Certificate PDF

The manufacturer, factory, product range and certification status must match the proposed wire.

Mistake 7: Ignoring Conductor Resistance

A wire can appear to have the correct diameter while still using an incorrect conductor construction. Verify resistance and dimensions together.

Mistake 8: Approving the Sample but Not the Production Batch

Production wire should match the approved sample in conductor structure, materials, dimensions, marking, color and packaging.


Frequently Asked Questions About T90 Nylon Wire

Is T90 wire rated 600V?

T90 nylon wire is commonly rated 600V. Buyers should still verify the voltage printed on the product and shown in the certification record.

Is T90 wire rated 90°C?

T90 indicates a maximum conductor temperature of 90°C under the conditions covered by the designation, normally dry locations.

Can T90 nylon wire be used in wet locations?

Do not assume wet-location approval from T90 alone. Look for an additional wet-location designation such as TWN75 and verify the certification and installation conditions.

Is T90 the same as THHN?

Not exactly. They commonly use similar copper/PVC/nylon construction, but T90 is a Canadian designation while THHN is associated with UL 83 in the United States. A wire must carry the appropriate certification and marking for the destination market.

Is T90 the same as THWN-2?

No. THWN-2 includes wet- and dry-location performance under its applicable US certification. T90 alone normally indicates dry-location performance. Some products carry both designations.

Can T90 wire be installed outdoors?

Only when the complete product rating and installation method permit it. Standard T90 wire should not be assumed sunlight- or weather-resistant.

Can T90 wire be buried directly?

Standard T90 building wire should not be assumed suitable for direct burial. Select a product specifically approved for the underground installation method.

Is T90 a wire or a cable?

T90 is normally a single insulated conductor, so “T90 wire” is the more technically precise term. “T90 cable” is often used informally by buyers and online searches.

Does T90 wire require conduit?

T90 wire is frequently installed in conduit or raceways. The exact permitted wiring methods depend on the certification, product marking and local electrical code.

Is T90 available in solid and stranded copper?

Yes. Depending on conductor size and manufacturer certification, T90 nylon wire can be supplied with solid or stranded annealed copper conductors.

Is FT1 the same as FT4?

No. FT1 and FT4 are different flame tests. An FT1-marked wire should not be represented as FT4 unless FT4 is separately tested, certified and marked.

What information should buyers provide when requesting a quote?

Provide the destination country, CSA standard, certification requirement, voltage, wire designations, conductor sizes, stranding, colors, wet-location requirement, flame rating, quantity, packaging, marking and required test documents.


Final Recommendation

T90 nylon wire is a practical 600V building-wire option for Canadian conduit and raceway systems, but the product name alone is not a complete specification.

Before placing an order, confirm:

  1. CSA or other accepted Canadian certification
  2. T90 Nylon and any required additional designation
  3. 600V product rating
  4. Copper conductor size and stranding
  5. Dry- or wet-location requirement
  6. PVC insulation and nylon dimensions
  7. FT1 or other required flame rating
  8. Sunlight, oil or tray-use requirements
  9. Approved cable marking
  10. Electrical and dimensional test results
  11. Packaging length
  12. Batch traceability

The most important distinction is between what the wire looks like and what it is actually certified to do. A PVC/nylon conductor may resemble T90, THHN or THWN-2, but only the approved marking and certification record establish its permitted ratings.

KingForYou Cable supplies building wire and electrical cable solutions for distributors, contractors, OEM customers and project buyers. If you need T90 nylon wire, T90/TWN75, THHN/THWN-2 or another Canadian building-wire construction, send us your required sizes, colors, certification, quantity and packaging through our contact page for specification review and quotation.