Should Isolation Transformer Be Earthed?

It all comes down to what a transformer actually is. ... The output of the isolation transformer still has a nominal output voltage of 230V between its output conductors, but there is no link to earth. This means that you can safely touch either conductor without risk of electric shock.

Do you ground an isolation transformer?

Although the ground is wired to the secondary output connector, it will not be used in most isolation transformer applications.

Do transformers need to be earthed?

Transformers themselves are not and do not have to be grounded. Grounding is mostly used for increased safety when it comes to appliances utilizing the mains electricity. You need to be aware though that since by using these transformers you forfit ground protection.