AS/NZS 3004.2 Explained
Last updated: October 2026
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Electrical installations in boats and marine shore-power connections
AS/NZS 3004.2:2014 provides electrical safety requirements for installations on boats, including electrical systems designed to operate from batteries, onboard power supplies and shore-power connections.
For MegaTest, the appliance electrical testing division of NZ Test Group, this standard is particularly relevant when inspecting electrical equipment and shore-power leads associated with recreational boats.
What Does AS/NZS 3004.2 Cover?
AS/NZS 3004.2 addresses the design, construction and installation of electrical systems in boats up to 50 metres in length.
It covers both alternating current (AC) and direct current (DC) electrical systems, including installations connected to an external electricity supply.
The standard recognises the particular electrical hazards associated with boats operating in wet, corrosive and confined environments.
Why Are Marine Electrical Installations Different?
Electrical equipment on boats operates in an environment where moisture, salt, vibration and movement can contribute to deterioration.
Shore-power connections introduce additional considerations because electricity is being supplied from a land-based installation to a vessel.
These conditions make appropriate electrical protection, suitable equipment and regular inspection particularly important.
What Is a Shore-Power Connection?
Shore power allows a boat to receive electricity from a marina or other suitable land-based electrical supply.
This may be used to operate onboard appliances, charge batteries or supply the vessel's electrical installation while berthed.
The connection typically involves a purpose-designed electrical lead and suitable connectors between the shore supply and the vessel.
What About Shore-Power Leads?
Shore-power leads are exposed to conditions that can cause physical damage and deterioration.
Inspection should consider the condition of the cable, connectors, insulation, strain relief and any signs of overheating, corrosion or inappropriate repairs.
Leads should be suitable for their intended marine application.
A damaged or unsuitable shore-power lead should not continue to be used simply because it has previously passed an electrical safety test.
Do Boats Need an Electrical Warrant of Fitness?
In New Zealand, pleasure vessels with connectable electrical installations may require an Electrical Warrant of Fitness (EWOF) when connecting to a shore-power supply.
An EWOF provides confirmation that the applicable electrical installation requirements have been assessed by an authorised electrical inspector.
This is different from the routine inspection and testing of an individual electrical lead or appliance.
A Test & Tag inspection does not replace an Electrical Warrant of Fitness.
What About RCD Protection?
Residual Current Devices (RCDs) provide additional protection against certain electrical faults.
They are particularly important where electrical equipment is being operated in environments involving water and conductive surfaces.
AS/NZS 3004.2 addresses electrical protection associated with boat installations, including applicable RCD requirements.
RCDs should be appropriately installed and tested as required.
Does AS/NZS 3760 Apply to Shore-Power Leads?
AS/NZS 3760 provides a framework for the in-service safety inspection and testing of electrical equipment and cord sets.
However, marine shore-power leads also have specific requirements associated with their intended use.
An inspection under AS/NZS 3760 should not be treated as confirmation that every requirement of AS/NZS 3004.2 has been satisfied.
Both the electrical safety of the lead and its suitability for marine use need to be considered.
What About Electrical Appliances Used on Boats?
Boats may contain ordinary electrical appliances such as kettles, heaters, refrigerators, battery chargers and other portable equipment.
These appliances should be suitable for their intended environment and maintained in safe condition.
Depending on the equipment and circumstances, AS/NZS 3760 may provide an appropriate framework for in-service inspection and testing.
However, testing an individual appliance does not establish compliance of the vessel's complete electrical installation.
Who Can Inspect a Boat's Electrical Installation?
Electrical installation work, formal verification and the issuing of an Electrical Warrant of Fitness require appropriately authorised electrical professionals.
Routine electrical equipment inspection and testing is a separate activity.
Understanding this distinction is important when arranging electrical safety checks for a boat.
Where Does AS/NZS 3004.2 Fit With Other Standards?
AS/NZS 3004.2 addresses electrical installations on boats.
AS/NZS 3004.1 deals with electrical installations associated with marinas.
AS/NZS 3760 provides the broader framework for in-service electrical equipment inspection and testing.
These standards address different aspects of electrical safety and should not be considered interchangeable.
Need Help With AS/NZS 3004.2?
MegaTest – Appliance Electrical Testing
MegaTest provides electrical equipment inspection and testing for construction sites and other workplaces as part of NZ Test Group.
We can assist with the inspection and testing of suitable electrical equipment and shore-power leads associated with recreational boats.
For electrical installation work or Electrical Warrants of Fitness, an appropriately authorised electrical professional is required.
If you're unsure what testing requirements apply to your marine electrical equipment, talk to our team.