sceepe
Senior Member
Was told by an old electrician who I respect a lot that he has had problems with dry types humming badly when a dry type (SDS) has equip grounding conductors (EGC's) from both the primary side panel and the secondary side panel tied to the ground buss in the dry type. Assume that Xo is bonded to the ground buss which is properly earthed to electrodes. Also, assume ground buss is bonded to the transformer case.
Looks like this (sorry to plagiarize the diagram)
He has proposed to terminate the EGC from the primary side panel to the xfmr case. Then insulate the ground buss from the xfmr case. Basically only bonding the transformer case to the primary side EGC
Has anyone else run into this?
Looks like this (sorry to plagiarize the diagram)
He has proposed to terminate the EGC from the primary side panel to the xfmr case. Then insulate the ground buss from the xfmr case. Basically only bonding the transformer case to the primary side EGC
Has anyone else run into this?