Loose cable is the cheapest thing to fix and the most common cause of a van fire. A cable-management kit is not about tidiness — it is about stopping a positive cable from rubbing through on a metal edge.
What actually needs managing
- High-current 12V runs — battery to fuse box, fuse box to inverter, solar controller to battery. These carry the amps, so they need the thickest protection.
- 230V mains runs, if you have a hook-up or inverter circuit. These need their own containment and should never share a gland with 12V.
- Water and waste pipework, which should not rest against electrical cable or anything that gets hot.
- Gas runs, which want their own route and drop-out vents at low level.
The parts that matter
| Part | What it does | Where it is worth spending |
|---|---|---|
| Split conduit | Contains a bundle and stops chafe | Along any run that touches metal or passes a bulkhead |
| Grommets / gland plates | Protects the cable where it passes through steel | Every single hole. A bare hole will cut through insulation |
| P-clips or adhesive mounts | Holds the run every 300–400mm | Any horizontal run that could sag onto a sharp edge |
| Spiral wrap | Bundles thin signal wiring | Sensor leads, USB runs, lighting tails |
| Labels | Lets you (or a buyer) identify a circuit later | Both ends of every run |
Sizing and routing
Work out the bundle diameter first, then buy conduit that fits it with room to move. Cables should be able to slide slightly — a bundle jammed tight in conduit chafes from the inside.
Route along the van's structure rather than across open panels, keep positive and negative of the same circuit together to reduce interference, and keep signal cable away from high-current runs. Where a run must cross a high-current cable, cross at right angles rather than running parallel.
Leave a service loop at every termination so a component can be removed without pulling the run out of its clips.
Fire and chafe risks
- A positive cable that touches bodywork will eventually short. Fuse at the battery end of every positive run and protect the whole length.
- Cable ties overtightened on soft insulation crush it and create a weak point. Use clips, not ties pulled hard.
- A run that crosses a door aperture, a seat runner or a moving bed frame will be cut. Route around every moving part.
- Conduit that ends in mid-air channels water into the cable rather than away from it. Finish runs at a gland or a drip loop.
A short checklist
- Every bulkhead penetration has a grommet or gland.
- Every positive run is fused at the battery end.
- The run is clipped at least every 400mm and cannot sag onto anything sharp.
- Signal and power cables are separated.
- Both ends of every circuit are labelled.
- Nothing rests on a heat source, a moving part or a water line.
What this guide is not
It is not a wiring standard and it does not replace BS 7671 for any 230V work. If you are installing mains voltage, use a qualified electrician.
