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Is anyone able to clarify with me how i can work out what earthing arrangement i have on site.
Supply comes into one of our motor switch rooms from an 11kv to LV transformer located directly outside. I can see 4 big copper bars (3phases and neutral) coming in which will then feed off to the Motor panels. There is an earth bar at the other side of the room which has various large earth cables connected.
There is one earth cable larger than the rest which i assume is the earthing supply cable and then the other slightly smaller ones i have traced which go to some of the bigger motors we have (100kw+).
Speaking to a few of the other guys (not electrical) and they said there are various earth spikes all over the site (may or may not be lightening protection). So would it be possible for our entire plant to be a TT or is it more likely that earth is derived from the neutral point of the hv transformer. Or is there an easy way to work this out
Thanks
Supply comes into one of our motor switch rooms from an 11kv to LV transformer located directly outside. I can see 4 big copper bars (3phases and neutral) coming in which will then feed off to the Motor panels. There is an earth bar at the other side of the room which has various large earth cables connected.
There is one earth cable larger than the rest which i assume is the earthing supply cable and then the other slightly smaller ones i have traced which go to some of the bigger motors we have (100kw+).
Speaking to a few of the other guys (not electrical) and they said there are various earth spikes all over the site (may or may not be lightening protection). So would it be possible for our entire plant to be a TT or is it more likely that earth is derived from the neutral point of the hv transformer. Or is there an easy way to work this out
Thanks