This discussion is locked.

You cannot post a reply to this discussion. If you have a question start a new discussion

Safety Isolating Transformers

Former Community Member over 4 years ago

I am an electrical inspector and I have come to large a newly installed machine (multiple moving parts, multiple independent motors and safety circuits) where the supply for the device is on a safety isolating transformer. This means that when I try and test the earth loop impedence for the supply I get no connection. In my mind this means that there is the potential that in an earth fault situation the device might not trip its breakers and other circuit protective devices as no fault path is generated. I have never seen an entire device protected by a safety isolating transformer and I don't know enough about them to say so I thought I would come to the experts on here for assistance! What would the advantages of this be and would there be safety implications of an installation like this?

Thanks in advance

Tom

Parents

0 Former Community Member over 4 years ago

Thanks for the replies, Its actually an amusement ride so I've got the main supply to the panel is on an isolating transformer and power is fed out of the panel to three phase connections on the track to a number of cars. If I had an earth fault on a supply to the track or one of the motors running the cars would that trip out the MPCBs that are protecting those circuits? All the earth connections are good and the main earth bar in the panel is linked to the rest of the buildings earth circuit.

The manufacturer has supplied the supply transformer so they are anticipating it but I've never seen an entire ride supplied by an isolating transformer?
Cancel
Vote Up 0 Vote Down

Cancel

Reply

0 Former Community Member over 4 years ago

Thanks for the replies, Its actually an amusement ride so I've got the main supply to the panel is on an isolating transformer and power is fed out of the panel to three phase connections on the track to a number of cars. If I had an earth fault on a supply to the track or one of the motors running the cars would that trip out the MPCBs that are protecting those circuits? All the earth connections are good and the main earth bar in the panel is linked to the rest of the buildings earth circuit.

The manufacturer has supplied the supply transformer so they are anticipating it but I've never seen an entire ride supplied by an isolating transformer?
Cancel
Vote Up 0 Vote Down

Cancel

Children

No Data

Safety Isolating Transformers

Community Rules & Guidelines