The right connections
Core count, each conductor size and identification.
State any mixed-size combination and protective-conductor requirement explicitly.UL AWM specification guide
UL 4476 Cable Specification
Multiple insulated cores within
a silicone outer jacket.
UL 4476 addresses a multicore cable with a silicone outer jacket. The core insulation, assembly and jacket all belong to the cable specification—choosing a recognised single wire does not define the finished cable.
- Cable form
- Two or more insulated cores
- Outer jacket
- Extruded silicone
- Use version
- Construction A or B
- Conductors
- Core insulation
- Outer jacket
THE ROLE OF THIS STYLE
Why specify UL 4476 multicore cable?
When several connections share one cable route, the outer jacket brings individually insulated cores into a common assembly. That assembly has its own dimensions, identification and use requirements.
UL 4476 describes a complete jacketed multicore cable, rather than a single insulated wire.
WHAT THE PROJECT NEEDSWHAT THE CABLE DRAWING MUST DEFINE
A shared cable route
Assembly, overall diameter and outer jacket.
A connector entry must fit the finished cable—not the diameter of one insulated core.A defined use version
Internal or external wiring and the corresponding construction.
Confirm the applicable cable version and recognition for the equipment.Recognised individual cores do not automatically establish recognition of the finished multicore cable.
READ THE COMPLETE ASSEMBLY
The insulation surrounds each core.
The jacket surrounds the cable.
These are separate layers with separate specifications. The outer jacket is not a substitute for the insulation between conductors.
Individually insulated cores
Each conductor has its own insulating layer. Define the core material and conductor construction before assembling the cable.
Core specifications
Each core’s size, stranding, insulation, diameter and identification.
The cable assembly
Insulated cores are brought together. A separator, filler or screen can change the construction and finished size.
Cable assembly
Core arrangement, any mixed sizes, and the presence and purpose of additional layers.
The silicone outer jacket
A separate silicone layer covers the assembly. Its dimensions are part of the selected construction.
Jacket specification
Jacket material, finished diameter, dimensional tolerance and the required use version.
The image shows an unscreened example. If screening is required, specify the screen construction and connection requirements separately; a black jacket does not indicate whether a screen is present.
A MATERIAL DIFFERENCE IN THE SPECIFICATION
UL 4476 Construction A and B
The historical style distinguishes two constructions. They differ in use, flame-test basis and jacket requirements—not merely in their names.
Historical UL 4476 construction distinctions. Verify the current requirements for the exact cable. On a small screen, swipe across the table.
| What changes? | Construction AINTERNAL WIRING | Construction BEXTERNAL WIRING |
|---|---|---|
| Use in the style reference | Internal wiring | External wiring |
| Flame-test reference | Horizontal flame | Cable flame |
| Jacket minimums | A-specific requirements, selected by diameter beneath the jacket | Higher minimums than A for the same diameter band in the historical table |
| What to request | The construction and recognition appropriate to the internal connection | The construction and recognition appropriate to the external connection |
Basis: UL 4476 historical style reference. No jacket dimensions should be taken from the illustration.
External wiring is not an outdoor-use rating. Outdoor, immersion and continuous-motion suitability are separate requirements.
SAME OUTER MATERIAL, DIFFERENT CORES
UL 4476 core insulation options
Both constructions below appear in supplier UL 4476 ranges. Define the inside and outside materials separately.
Silicone-insulated cores
+ silicone jacket
Silicone is used at both levels: around each conductor and around the assembled cable. The core insulation and jacket still have their own dimensions and formulations.
- Specify
- Core insulation, jacket, conductor arrangement and the complete cable rating.
- Supplier example
- OMERIN 4476-S150
Fluoropolymer-insulated cores
+ silicone jacket
The outer jacket remains silicone while the core insulation uses a different material. This is a material change inside the cable, even if the outside looks similar.
- Specify
- The exact fluoropolymer, core dimensions and recognised complete construction.
- Supplier example
- OMERIN 4476-E150
Technical reference: OMERIN product examples. These examples do not define ANYANG's available versions.
FROM CORE SCHEDULE TO CABLE ROUTE
What to specify for a UL 4476 cable
For a quotation, include core sizes, identification, overall diameter and installation conditions.
COMPLETE THE CABLE SCHEDULE
Core identification
- State the size and function of each core, including mixed sizes.
- Specify colours or numbering and any protective conductor.
- Include connector, gland and finished-diameter constraints.
- Describe the cable route, temperature and movement.
KEEP RATINGS TIED TO THEIR BASIS
- Temperature & voltage
- Use the ratings for the same selected cable and approval. Do not combine values from different standards or versions.
- Flexibility & motion
- A flexible cable is not automatically suitable for repeated bending or torsion. Describe the movement duty.
- Jacket environment
- Check clamping, sharp edges and the actual fluids or exposure. Do not infer unlimited protection from silicone alone.
Product references with separate rating and use conditions: HELUKABEL SiHF UL/CSA and Letronic UL 4476.
BEFORE YOU SPECIFY
Frequently asked questions
Is any silicone-sheathed multicore cable a UL 4476 cable?
No. A similar material and shape do not establish product recognition. Confirm the complete cable construction, marking and current documentation.
Can the cores have different conductor sizes?
A mixed-size assembly is possible within the style framework, but the complete arrangement must be specified and covered by the actual construction. Include the size and identity of every core group.
Does UL 4476 always include a metallic screen?
No. Screening is a separate construction choice. Specify whether it is required and how it must connect; the illustration shows no screen.
Can I replace a single-core UL style with UL 4476?
UL 4476 describes a jacketed multicore cable. Single-conductor specifications describe individual insulated wires.
FROM STYLE TO PRODUCT SPECIFICATION
Discuss a UL 4476 specification
Start with a core schedule and the intended cable route. Confirm the complete proposed cable—not only the individual cores—before selecting the product version.
Core schedule
Number of cores, each conductor size, core insulation, colours or numbering and protective-conductor requirement.
Complete construction
Jacket requirement, any screen or separator, finished diameter and connector constraints.
Use & recognition
Internal or external wiring, voltage, temperature, movement and required product documentation.
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