Four statements about safety when designing electrical products are listed.
1- If the outer casing is a conductor, it should be earthed.
2- If the outer casing is a conductor, it should not be earthed.
3- If the outer casing is an insulator, it should be earthed.
4- If the outer casing is an insulator, it should not be earthed.
Which statements are correct?
1 )
1 and 3
1 and 4
3 )
2 and 3
4 )
2 and 4
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