Mains transformer core is earthed?

[Faringdon]

Hi,
Is the core of this isolation transformer earthed?

https://www.screwfix.com/p/carroll-meynell-3000va-intermittent-isolation-transformer-230v-230v-blue/320HV?kpid=320HV&cm_mmc=Google-_-Datafeed-_-Electrical%20and%20Lighting?kpid=KINASEKPID&cm_mmc=Google-_-TOKEN1-_-TOKEN2&gad_source=1&gclid=EAIaIQobChMIurKz6pO_hwMVZo9QBh2u4gyPEAQYASABEgJZOvD_BwE&gclsrc=aw.ds


https://www.carroll-meynell.com/product/isolation-transformer-230-230v-3kva-cm3000-230-euro/

Earth goes into it...do you know what that earth connects to?
& Why is it so noisy when its switched ON, even with its secondary open?
(ie noisy electrically to other equipment plugged in on the same phase, making it malfunction)

[techneut]

My guess is that there is a shield between primary and secundary windings that is earthed. I have a 2A isolation transformer and you can realy hear the dumph when it is powered on. The magnatising current with it's mgnetic field is my guess.