Shore Power

Connecting to power outlets

We want you and your vessel to be safe connecting to the power supply at Milford Marina. Our requirements are similar to those across Marinas in New Zealand, except that no vessel is allowed to be connected to power when not attended by the berth holder.


The electrical supply at Milford Marina is 230V, 50 Hz supplied by RCD protected socket outlets to fit a Standard IEC 60309-2 (round pin) plug rated at no less than 16A.

An RCD is an electrical safety device that provides protection by rapidly disconnecting the electricity supply should a fault to earth be detected.


Berth Holders connecting to Milford Marina power must:

Have berth holder in attendance while the power lead is connected – NO EXCEPTIONS

Have a valid tested and tagged shore power lead with the correct plug (IP67). Leads should be tested and tagged annually (AS/NZS3760). Leads should not exceed 25m in length and must not be connected to the electrical supply while it is coiled up.

Display a current Electrical Warrant of Fitness (EWOF) that complies with AS/NZS3004.2 (if vessel is connected – and then only while berth holder is present)


Check if fittings are worn or damaged (if so, do not plug in and report to Milford Marina management on 020 4138 2160).

Test the RCD – If it does not trip, do not plug in and report to Milford Marina management on 020 4138 2160) immediately.

Turn off the power by pressing the RCD ‘test’ button before plugging in.

Insert the plug fully into the socket.

Ensure the power cable is free to move without snagging or chaffing and is free of the water.

Turn on the power switch and reset the RCD.


Permits vessel movement in the berth without undue stress on the lead and fittings. Consider tidal movement of vessel if you will be using for a number of hours.

Prevents water flowing along the lead reaching the vessel inlet or the supply plug.

Minimises the likelihood of the plug or lead falling in the water.

Minimises the possibility of accidental disconnection.

Doesn’t present a hazard to persons walking near the vessel or on the piers


Connecting a vessel to the marina power supply may result in accelerated corrosion of the vessel’s under water metallic parts. It’s strongly advised that additional sacrificial anodes or galvanic isolators complying with AS/NZS3004.2 Clause 4.6.4 be used to reduce these effects.

It’s the responsibility of the vessel owner to ensure that either an isolating transformer and/or a galvanic isolator is installed, if required.

Given that power will only be connected for short periods (with berth holder in attendance) a galvanic isolator may not be required – but check with a registered professional for advice on these matters.


The supply of electricity is not guaranteed and should not be relied upon.