Solar Plant Diagram for installing new SWBD for TX secondary low side protection

[rayp1]

Situation: 25 dry type 480-3W/480V-4W transformers each serve one remote Panel. The secondary conductors are longer than 100 feet. One option to be code compliant versus a coordination study under consideration is to install this same room as the transformer multiple SWBD's containing the protection for the secondary conductors feeding the remote load circuit Panels.

Also, the cable tray system is rated and labeled as an equipment grounding conductor.

Question: Do you see any code violations or concerns with the attached diagram.

 

[Smart $]

Need larger (better resolution) picture...

 

[rayp1]

Better Picture

Better Picture

Another try on attachment, sorry and thank you.

 

[Smart $]

...

Question: Do you see any code violations or concerns with the attached diagram.

Assuming all conductors are routed in cable tray....

1) Each transformer to secondary switchboard will require a supply-side bonding jumper (SSBJ). It has to be a non-flexible metal raceway, wire, or bus type... no exception for cable tray [250.30(A)(2)].

2) A GEC for grounding of transformer secondary grounded conductor and its EGC system is required. While cable tray may* qualify as an EGC, it does not qualify for use as a GEC.

3) *While many metal cable trays are identified for use as an EGC, it must still meet the cross-sectional area requirement of 392.60(A). For example: 400A ocpd - steel 1.00in², aluminum 0.40in².

That's all I can think of for now...