The reason I've seen the existing SDS is that a contractor is installing 4160V from the primary side (feed-thru) terminals to a new 150KVA 208/120 system some 1000' away.
How would be a definite method to determine that the GEC at the existing SDS does, in-fact, continue to the electrical equipment in the existing building?
Another question: Is the drain wire on the 3 - 5KV - 1/C's to the new transformer a sufficient (size) grounding conductor to/at the new 150KVA ?
