Transformer Grounding

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Duuuuug

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Existing Installation
800Amp Main Panelboard (MP) with 120Amp breaker feeding a 480-208Y/120 75KVA Transformer
Primary - 3-#1 & 1-#6gnd
Secondary - 4-250mcm & 1-#2gnd
Transformer feeds a 225Amp Main Breaker Panelboard (PB)
The contractor installed a ground rod with a #2-GEC wired to PB.

This does not appear to be right because the ground rod is not connected to anything else.
1. Is this legal?
2. Since building steel is not available can the contractor wire a GEC from PB straight to the 800Amp service electrodes?
 
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