Nw Detroit

[Robz]

If an inspector requires the available fault current at a business that we are installing a generator and the company supplying the power cannot provide this information, who do we get this information from?

 

[charlie b]

I can't imagine the power company not knowing the fault current available at each point of supply.

 

[zog]

Rob,

You need to contact DTE, go to thier website and look at what region the customer is in, each DTE reqion has an assigned Engineer for his area just for fault currents.

Or if you are waaay NW Detroit, call consumers Lansing office, they are not quite as organized for this yet.

 

[zog]

See! This is exactly why everone should have thier location on thier profile.

 

[Jljohnson]

I'm certain that the POCO could provide the availablr fault current for their equipment, the OP refers to a generator, not a utility transformer. This information should come from the genset manufacturer. If they are telling you that they cannot provide it, you are probably talking to the salesman and not one of their engineers. Just a guess.

 

[steve66]

You need the utility to give you the impedence and size of the transformer that feeds the service.

Then you just assume there is infinite current available on the primary of the transformer. (It can't get any worse than that). Then it is just a calculation to find the fault current available on the secondary side of the transformer, and at other points downstream.

Steve