Bs 7871 allows an interlocked socket.
722.55.101.0.201.1 Each AC charging point shall incorporate:
(i) one socket-outlet complying with BS 1363-2 marked ‘EV’ on its rear and, except where there is no possibility
of confusion, a label shall be provided on the front face or adjacent to the socket-outlet or its enclosure
stating: ‘suitable for electric vehicle charging’, or
(ii) one socket-outlet or connector complying with BS EN 60309-2 which is interlocked and classified to
clause 6.1.5 of BS EN 60309-1 to prevent the socket contacts being live when accessible, or
(iii) one socket-outlet or connector complying with BS EN 60309-2 which is part of an interlocked self-contained
product complying with BS EN 60309-4 and classified to clauses 6.1.101 and 6.1.102 to prevent the socket
contacts being live when accessible,