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David is correct.
And I may Add.
Most electrocutions or shocks happen when the victim touches an active conductor while the body is earthed.
Very few shocks occur between the active and neutral directly. As it requires the victim to touch two conductors.
If you do earth the supply you need to have the earth leakage circuit breaker (safety Breaker). If you do not earth, the safety breaker is not necessary and not operable as David said. The safety breaker does not protect against shocks between active and neutral.
That is about the simplest I can explain it. Hope it helps.
Cheers
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