Your Insurer Wants a Wiring Diagram — Here's What That Actually Means
If your insurer or surveyor has asked for an electrical wiring diagram, the honest next question is whether the free tool you just found online is good enough. It draws a layout, and it's free — but it works from a generic template and a rule-of-thumb wire gauge, not your boat's actual run lengths and loads. It's also not drawn to any symbol standard an assessor would recognise, which is often exactly what gets a submitted diagram sent back. What insurers are actually asking for is closer to a full electrical schematic — a calculated, symbol-based document — than the point-to-point sketch "wiring diagram" usually means.
What Insurers Are Actually Asking For
Rising numbers of insurers and surveyors are asking for this documentation specifically because so few boats have it — it's a newer requirement, not a formality everyone already has covered. What they want, in practice, is an electrical schematic that matches the boat as it exists today (as-built, not as it left the factory), shows conductor size and voltage-drop for the actual runs on board, and uses a recognisable symbol set. Maurice Marine's Electrical System Drafting service produces exactly that: calculated for your boat, drawn to the IEC 60617 international standard, and kept current as the boat changes.
What We Do
- Electrical System Drafting — the direct answer to this page's search.
- Already have a diagram that needs checking against AS/NZS 3004 rather than redrawing? See Standards & Compliance Review.
Get in Touch
Send us what your insurer or surveyor actually asked for, and we'll tell you whether a full electrical schematic or a compliance check is the right job.
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