The cable must not be earthed at both ends, if the charging point has a different earthing arrangement due to PME (own TT for example) ... otherwise, you defeat the object of having TT to get round the PME issue.

Otherwise, earthing at both ends is usually better from an EMC point of view, but you will need to consider:

1. the effect of "defeating" an open-PEN detection device if one is fitted.
2. current-carrying capacity of the armour, as it will share any fault current of the mains power cable. An adiabatic check may be necessary. dependent on current sharing.

In all cases, SPDs may be necessary for the data cable in accordance with BS EN 50174-3, and may be required for the charging point itself, because of LPZ concept. SPDs almost certainly necessary for both power and data if the charging point has its own TT earthing arrangement.

The cable must not be earthed at both ends, if the charging point has a different earthing arrangement due to PME (own TT for example) ... otherwise, you defeat the object of having TT to get round the PME issue.

Otherwise, earthing at both ends is usually better from an EMC point of view, but you will need to consider:

1. the effect of "defeating" an open-PEN detection device if one is fitted.
2. current-carrying capacity of the armour, as it will share any fault current of the mains power cable. An adiabatic check may be necessary. dependent on current sharing.

In all cases, SPDs may be necessary for the data cable in accordance with BS EN 50174-3, and may be required for the charging point itself, because of LPZ concept. SPDs almost certainly necessary for both power and data if the charging point has its own TT earthing arrangement.