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How do I install an Ohme Home Pro?

Person using the Ohme Home Pro ev charger

The installation must be compliant with the IET Wiring Regulations and the IET Code of Practice for Electric Vehicle Charging Equipment. Installation should be carried out by a competent electrician with appropriate knowledge of EV charge point installations.

Drilling backplate of Ohme Home Pro into a brick wall

Step 1

The Ohme Home Pro is designed to be wall mounted to a flat surface. Fixings are included which are suitable for most wall surfaces (e.g. brick/render) but the installer should select their own fixings if these are not appropriate.

Attach the back plate to the wall using the four fixings supplied.

Lifting the Ohme Home Pro charging unit up onto the back plate

Step 2

Mount the unit, carefully guiding the three lugs into the rear of the unit.

Installer screwing in the side screws to hold the Ohme Home Pro in place to the backplate

Step 3

Use the supplied three M4 short machine screws to fix the unit to the back plate.

Junction box open showing internal wiring

Step 4

The Ohme Home Pro is supplied with a one metre fixed input cable/flying lead requiring termination on-site to a suitable junction box, isolation switch, or mini-CU (not supplied). The flying lead conductors are 6mm2 copper, the overall diameter is 15.2mm, suitable for a No. 6 cable cleat.

To connect, typically an installer will either:

·  Install a junction box at ankle height
·  Feed the input cable through a wall and terminate on the other side

Note: The junction box needs to be rated to at least 32A, have sufficient IP rating for the location, and have space for a three-way terminal block (no load balancing) or five-way terminal block (with load balancing).

CT clamp being attached around a cable

Step 5

The Ohme Home Pro has a dynamic load-balancing feature. A current sensor (CT) clamp is provided to measure the electrical demand of the property, or sub-board. The unit will limit the maximum current available to the vehicle to keep the household demand below the set threshold/fuse value.

Where load balancing is activated, if the CT clamp is removed, installed in the wrong location or is faulty, the unit will revert to charge at a maximum of 16A. It is therefore sensible to ensure the spare capacity, after taking account of other loads and diversity, is at least 16A.

Installer screwing the charging plug holster to the wall

Step 6

The charger comes complete with a cable holder and charging gun holster to retain the cable and vehicle connector when not connected to the vehicle. Use a further four fixings to mount these to the wall.

Once the charger is installed and connected to power it will turn on and be ready for commissioning.

Installer coiling the charging cable onto the cable holder

Storage while not in use

When the charger is unplugged from the vehicle it must be stowed away correctly.

Wrap the cable around the cable holder.

The charger plug must be pushed into the holster, you will hear a click when it is locked in place. This protects the charging pins from the elements. Push the button on the top of the holster to release the charging plug.

Installation complete

Now that you’ve successfully installed the Ohme Home Pro, check out the following article for how to commission an Ohme charger.

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