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Vacuum cleaners are normally Class II and do not require an earth. They will display the square-within-a-square symbol on the data label. It is easy for manufacturers to make vacs Class II because the motor is buried within the machine, and advantageous not to rely on an earth because vac power cables often fail with internal breaks through repeated flexing and the earth core continuity can become suspect.
Socket buzzing only under load - bad connection or bad contact arcing. Check cables correctly inserted into terminals and tighten terminal screws. If problem persists, change socket. Simples.
Socket buzzing only under load - bad connection or bad contact arcing. Check cables correctly inserted into terminals and tighten terminal screws. If problem persists, change socket. Simples.