Hide Electrical Wires (Split Loom Tubing Sleeves)
Split-loom tubing can gather and protect compatible, exposed cables, but it is not automatically a raceway or a way to make concealed wiring legal. First identify the cable, check its route and the loom’s markings, then install and secure each item as required. Keep splice boxes accessible, and use an approved wiring method when building wiring must be concealed.
Modern TVs, soundbars, routers, and smart-home devices can leave several cables visible along one wall. Split loom offers a simple way to group some exposed wiring, but a tidy bundle is not always a safe or permitted one. I start by identifying what each cable is and where it runs. That step matters more than the sleeve’s appearance.
The guide below explains when split-loom tubing may help, how to choose and fit it, and when to use another wiring method. Electrical rules vary by location, so confirm the locally adopted code and requirements with your local authority having jurisdiction (AHJ), or a qualified electrician.
Planning the Route and Identifying the Wiring
Before choosing a sleeve, identify the cable type, voltage, location, support, and any splice points. Split loom is a protective cover for compatible cable bundles, not a general-purpose wiring pathway. The cable’s listing, the loom’s instructions, and the adopted local code determine what is suitable.
Look at the cable jacket and any labels before moving the bundle. It may be low-voltage cable, such as a speaker or data cable; building wiring, such as nonmetallic-sheathed cable (NM); or a flexible power cord. These types do not share the same rules.
Then trace the full route. Note whether the cable is exposed, passes through framing, crosses a sharp edge, approaches a heat source, or enters a box. Mark every splice and connection. A sleeve cannot make an unsuitable route acceptable or turn an inaccessible connection into an acceptable one.
- Low-voltage cable: Loom may help gather exposed wires if both the cable and sleeve instructions permit that use.
- Building cable: Use a wiring method allowed for that cable and location. Loom alone does not replace a required raceway, support, or protection.
- Flexible cord: Do not hide it inside a wall, ceiling, floor, or other concealed space just because it is covered. NEC 400.12 restricts flexible-cord uses.
If you cannot identify a cable, do not cut, staple, or push it into a wall. Have a qualified electrician or other suitable professional identify it first. The next step is to decide whether the route can remain exposed or requires an approved concealed-wiring method.
What Split Loom Does and Does Not Do
Split loom is a slotted tube that opens along its length so cables can be placed inside without threading them through from an end. It can organize a bundle and provide a layer of physical protection where the product is suitable. It does not, by itself, authorize wiring to be hidden inside building finishes.
Loom products vary. Check the manufacturer’s stated inside diameter, temperature range, flame performance, and installation limits. Do not assume a generic sleeve is plenum-rated, heat-resistant, electrically listed, or approved for a particular cable. There is no universal fill percentage or load rating for generic split loom.
Checking Framing Clearances, Heat, and Access
A route that looks clear from the room may pass close to framing, hot equipment, or a hidden splice. Check the whole path before installing a sleeve or closing a wall. The code requirements apply to the wiring method, not just to the loom around it.
For NM cable passing through a bored hole in a wood framing member, NEC 300.4(A)(1) calls for at least 1¼ inches between the nearest wood edge and the cable. If that clearance cannot be maintained, the cable must be protected with a steel plate at least 1⁄16 inch thick or an approved equivalent.
That measurement is not a general clearance rule for every cable or every installation. Confirm the applicable code and cable instructions for the wiring method in use. Do not assume adding loom changes the required distance or counts as an approved nail plate.
Check for sharp metal edges, hot surfaces, and sources of heat. The loom’s listed temperature range and instructions matter; there is no universal NEC airflow or clearance value for split loom. Avoid covering or bundling conductors in a way that conflicts with their listing or impairs required heat dissipation.
Also locate junction and pull boxes. NEC 314.29 requires them to remain accessible without removing building finish. Do not cover a box with drywall, cabinetry, or another permanent finish. Keep every required box reachable, and resolve any unclear framing or heat concern before proceeding.
Choosing and Installing Loom or an Approved Path
Use split loom only when it suits the cable, location, and product instructions. If building wiring needs a pathway, select a listed raceway or another wiring method approved for that installation. A sleeve that looks like conduit is not necessarily a raceway.
Select the Right Sleeve
Measure the bundle at its widest point and compare it with the loom manufacturer’s stated inside diameter. The tubing should close without forcing, crushing, or sharply bending the cables. There is no universal fill percentage for generic loom, so do not apply conduit-fill calculations to it.
Check the product markings and instructions for material, temperature range, flame performance, and allowed use. If the instructions do not clearly cover the planned location, choose a product that does or ask a qualified professional. Do not use a sleeve near heat or in a plenum space based on appearance alone.
| Situation | Split loom may be suitable? | What to check |
|---|---|---|
| Exposed low-voltage bundle along a wall | Sometimes | Cable and loom instructions, heat, edges, and secure routing |
| NM cable visible in a permitted exposed location | Not as a substitute for code requirements | Cable support, protection, and local rules |
| Flexible power cord routed inside a wall | No | Loom does not make concealed cord use permitted |
| Cable passing through framing | Loom alone is not enough | Required clearance and approved protection |
| Splice or pull box hidden behind a finish | No | Box must remain accessible |
Fit the Tubing Without Damaging Cables
De-energize circuits before handling electrical wiring. For low-voltage cables, disconnect equipment if needed to avoid pulling on connectors or damaging devices. Open the loom’s split and place the cable bundle inside, following the product instructions.
Do not overfill the sleeve, kink the cables, or force the loom shut. Keep the cable’s natural bend radius where its manufacturer specifies one. Avoid sharp bends and tension at connectors. If the sleeve will not close easily, use a larger suitable product or separate the cables into more than one bundle.
Do not staple or clamp through the loom. A fastener can pierce or crush cables underneath. Secure the cable independently where required, using suitable supports that do not damage it. Use loom as a cover, not as a substitute for cable support or an approved wiring pathway.
Verifying Support, Protection, and Inspection Readiness
Before finishing the job, check that the cable is intact, supported as required, and routed through an approved path. Confirm that the loom is not pinched and that boxes remain accessible. If the work involves concealed building wiring, local inspection or a qualified electrician may be required.
For NM cable, NEC 334.30 generally requires support at intervals no greater than 4½ feet and within 12 inches of each box, cabinet, or fitting, subject to the code’s stated exceptions. The loom does not replace those support requirements. Confirm the applicable code edition and exceptions with the AHJ.
Walk the route from end to end. Look for damaged jackets, unsupported spans, sharp edges, tight bends, and contact with heat sources. Check that the cable is not trapped under a fixture or furniture and that the sleeve is not crushed by clips or fasteners.
If the cable enters a junction or pull box, verify that the box remains accessible without removing building finish. Do not conceal a splice behind a wall simply because the wires are enclosed in tubing. When a route or connection does not meet the applicable rules, stop and have it corrected before closing the wall.
Common Installation Scenarios
These examples reflect common situations I assess when planning cable concealment. They are practical scenarios, not a substitute for inspecting a specific home or checking local requirements.
- TV and speaker cables along a finished wall: I first separate low-voltage cables from power cords and identify any building wiring. A suitable loom may organize exposed low-voltage wires. If the goal is to place power wiring inside the wall, use a permitted wiring method rather than hiding a flexible cord in tubing.
- NM cable near a stud edge: I check the bored-hole clearance. If the required 1¼-inch distance is not available, the cable needs a steel plate at least 1⁄16 inch thick or an approved equivalent, as required by NEC 300.4(A)(1). Loom does not replace that protection.
- A cable bundle passing near a splice box: I leave the box accessible. Covering it with a permanent finish would conflict with the accessibility requirement in NEC 314.29, even if the cable route itself looks neat.
- A tightly packed bundle that will not fit: I do not force the split closed. I check the manufacturer’s inside-diameter and use limits, then select a suitable larger sleeve or separate the cables if the product instructions allow it.
FAQ: Split-Loom Tubing and Cable Concealment
These quick answers address common questions about using split loom for cable management. The key distinction is whether the sleeve is organizing exposed cable or being treated as a wiring method. Always check the cable and product instructions, the adopted code, and local requirements for the actual route.
Can split loom be used inside a wall?
Split loom does not automatically permit wiring to be concealed inside a wall. Use a wiring method allowed for the cable and location, and follow its listing and local code. Flexible power cords cannot be made suitable for concealed building wiring by adding a sleeve.
Does split loom count as conduit?
No, not by default. Generic split loom is not automatically a listed raceway. Use a raceway listed and permitted for the installation when a raceway is required, and follow the product instructions and local code.
Can I put NM cable inside split loom?
Only if the cable, loom, location, and installation instructions permit that use. Loom does not replace NM cable support, framing protection, or other code requirements. Ask the AHJ or an electrician if the intended use is unclear.
How much space should I leave in a split-loom tube?
There is no universal fill percentage for generic split loom. Compare the bundle with the manufacturer’s stated inside diameter and use limits. The sleeve should close without crushing cables, and it must not conflict with cable listings or heat-dissipation needs.
Can I staple through split loom to hold it in place?
No. Do not staple or clamp through the loom, since a fastener can pierce or crush the cable bundle. Secure the cable with an appropriate method where required, without damaging the cable or relying on the sleeve as support.
Does split loom protect cable near a stud edge?
Not by itself. For NM cable through bored wood framing, NEC 300.4(A)(1) calls for 1¼ inches of clearance from the nearest wood edge, or a steel plate at least 1⁄16 inch thick or an approved equivalent where that clearance is not met.
Can I cover a junction box with loom and drywall?
No. The box must remain accessible without removing building finish under NEC 314.29. A sleeve around nearby cables does not change that requirement. Keep the box reachable for inspection and service.
Is split loom safe near heat or in a plenum?
Only if the product is rated and approved for that location. Check its markings and manufacturer instructions. Do not assume a generic sleeve is heat-resistant or plenum-rated, and do not cover conductors in a way that conflicts with their listing.
Does loom replace NM cable supports?
No. NEC 334.30 generally requires NM cable to be secured at intervals no greater than 4½ feet and within 12 inches of boxes, cabinets, or fittings, subject to stated exceptions. Loom does not remove those support requirements.
Conclusion
Split loom can make an exposed, compatible cable bundle neater and add a layer of protection, but it is not a shortcut for concealed wiring. Identify the cable, check the route and product instructions, and keep required support and box access intact. When the installation needs a raceway or another approved wiring method, use one that is permitted for the location and confirmed by the AHJ.
(This article was written by one of our staff writers, Michael Holloway. Visit our Meet the Team page.)
