I install a lot of 200 amp 480 volt service for pump stations, with a 5 kva lighting transformer. These do not have structural steel so the nearest avavilable electrode is the building GE system. I'll run from the lighting panel through the raceway and then outside to the ground rods. Ii its a metal enclosure or raceway I bond at both ends, this makes a lot of work and is a good time and materials job.
If possible I'll run straigt outside and use PVC conduit to sleeve it. Sometimes I'll go out through the service disconenct (primary, if you will).
For connections to the lighting transformer, Ilve started using liquid tight non-metallic flex. Then I don't have to bond the flex.
