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When there is no secondary side disconnecting means or overcurrent device s , the neutral-to-case bond is made at the source of the separately derived system.

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The star connection requires the use of three transformers, and if any one transformer becomes fault or disabled, the whole group might become disabled.

122 A : The size of the equipment grounding bonding conductor for the transformer primary is based on the primary protection device.

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5 kVA 175A Primary Protection Step 2 , Table 250.

45 kVA 125A x 1.

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Three Phase Transformer Construction The three-limb core-type three-phase transformer is the most common method of three-phase transformer construction allowing the phases to be magnetically linked.