Transformers are now required to have a place to terminate conductors. Article 450 Transformers and Transformer Vaults Part I. General Provisions 450.10 Grounding (A) Dry-Type Transformer Enclosures. Where separate equipment grounding conductors and supply-side bonding jumpers are installed, a terminal bar for these conductors must be installed inside the enclosure. The terminal bar must not cover any ventilation openings (Fig. 30). Exception: Where a dry-type transformer is equipped ...

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