Commando socket installation
This section is intended to be a quick reference guide for electricians to help ensure a
commando socket, intended to be used for EV charging, is installed compliant with the
18th Edition Wiring Regulations (Amendment 1). Please note this guide is only applicable
for single phase dwellings with PME supply (TN-C-S).
Ohme's commando product uses a 32 A IEC 60309 (Blue) CEE "Commando" single phase
socket.
RCD Selection
Both Ohme Home and Ohme Go chargers have Type A and 6 mA DC residual current
functionality (RCD) built in. Where you are asked to install a socket for EV charging, we
recommend that Type AC RCDs are not used upstream.
Earthing
For installation of a socket intended to be used for EV charging, the relevant section of
the Wiring Regulations applies (currently section 722). For a TN-C-S supply, it is not
permitted to install a socket to charge an EV outdoors if connected to the PME without
an additional device as described in 722.411.4.1. You can either:
• Install a separate earth to make the charger supply TT
• Install a PEN fault device which disconnects the supply in line with regulation
722.411.4.1
For help in selecting a PEN fault device, please contact help@ohme-ev.com.
Socket selection
For domestic properties, the Commando socket used should be interlocked, which
prevents the socket contact becoming live when a plug is not connected. There are
several types which are readily commercially available. It should also have adequate IP
rating for the installation location.
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