Split Loom & Spiral Wrap

What Is Split Loom & Spiral Wrap?

Split loom and spiral wrap are two of the most essential wire management solutions for marine and RV electrical systems. At their core, both products serve the same mission: protecting wire bundles and cable harnesses from the abrasion, chafing, heat, and moisture that are an everyday reality aboard a boat or in a recreational vehicle. Without proper protection, exposed wiring can degrade quickly — leading to shorts, fires, or costly repairs at exactly the wrong moment.

Split loom is a corrugated, flexible conduit tubing with a lengthwise slit that allows it to snap easily over existing wires without disconnecting any terminals. This makes it ideal for retrofitting wire runs on an existing boat or RV. Spiral wrap, by contrast, winds helically around wire bundles, offering a more open-style protection that permits flexible routing of cable harnesses while still guarding against abrasion. The open coil design also allows you to add or remove individual wires at any point along the run without unwrapping the entire bundle.

Why Wire Protection Matters on Boats and RVs

Marine and RV environments are uniquely demanding. Constant vibration, exposure to UV radiation, salt air, fuel vapors, and tight routing paths around engines and transoms can all accelerate wire wear. Beyond simple organization, high-quality split loom and spiral wrap must meet rigorous safety standards. Look for products that are flame-retardant and self-extinguishing — ideally meeting UL 94 V-2 ratings as required by ABYC Electrical Standard E-11, which applies to all boats with AC or DC systems. Compliance with this standard ensures that the conduit will not propagate fire in the event of an electrical fault.

When selecting the right product for your application, consider these key factors:

• Diameter: Match the conduit inner diameter to your wire bundle size — common sizes range from 1/4" to 2".
• Material: Fire-retardant polypropylene or polyethylene is standard for marine use; high-temp nylon variants are available for engine-bay applications.
• UV resistance: For exterior or deck-mounted runs, choose UV-stabilized materials to prevent premature cracking.
• Flexibility: For dynamic routing — such as transom-to-outboard runs — prioritize conduit rated for repeated flexing without cracking.
• Slit vs. unslit: Slit conduit installs over existing wires without disconnecting; unslit conduit is threaded and offers a more secure, sealed run.

Trident Hose: Marine-Grade Wire Conduit

Trident Hose is a well-respected name in marine fluid and wire management, and their split loom conduit is a go-to choice for professional riggers and serious boaters alike. Their corrugated polypropylene split wire conduit is safe and easy to install for multi-wire harness, cable and hose routing — including demanding applications like transom-to-outboard engine runs and inboard engine wire harnesses. Critically, Trident's split loom meets UL 94 V-2 standards as required by ABYC E-11, giving installers confidence that their wire protection is up to code. Available in multiple diameters from 1/4" to 2", it's a versatile solution for virtually any wire management task on the water.