I'm installing 18KV underground cable from a new tap-box, to an existing one (see oneline attached). The iso-phases and tap-boxes are isolated (frames are not bonded) in all locations. Each Tap-box has a Power Transformer for metering. Through this set-up, both GSUs will be feeding separate AUX transformers. Is there a reason why I shouldn't install equipment ground with underground cable? I'm thinking a ground fault in new cable may return through existing tap-box ground bar and inject itself into both GSUs somehow. Any thoughts?
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