The wooden board DBs' often had isolators for geysers and stoves which were not lockable. Hence the regulatory requirement that it be within arms reach of the appliance or lockable in the open position when at the DB.
Locking devices for DB isolators might be cheap, but availability is another story. I requested a few at Voltex 20+ years ago and am still waiting for them. An isolator by the geyser is both safer and more convenient.
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