Buck, I think your customer has recieved some information from an engineer or technician who is stating IEEE Emerald specifications, and has confused him/herself.
Emerald specs do call for the IG to originate on the Xo of a customer owned isolation transformer, not a utility owned transformer. As stated already what your customer is asking for will not be permitted by the utility. It would be nice if the utility would supply EGC circuits, but it is not going to happen.
For your application the IG has to originate from the in the disconnect that contains the N-G bond point.
If your customer wants a IEEE spec IG ground, they would need to install a shielded isolation transformer to supply the Telco equipment. This is a common practice, but it is not supplied by the utility. Hope this helps...
