Medium-Voltage Distribution Transformers
Cross-references point to the standards that now own the topic after the October electrical rewrites: MV cable to medium-voltage-cables, energy storage to battery-energy-storage-systems, service grounding to grounding-and-bonding, lightning to lightning-protection.
Showing changes from Rev 3
to Rev 4
in Medium-Voltage Distribution Transformers.
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title: Medium-Voltage Distribution Transformers
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- transformers rated 600 V and below on both windings ([[sync/low-voltage-dry-type-transformers]])
- unit substations in which the transformer, the primary switch, and the secondary switchgear are one close-coupled assembly ([[sync/secondary-unit-substations]])
−- the medium-voltage switchgear, primary switch, or service equipment upstream of the transformer ([[sync/medium-voltage-switchgear]], [[sync/electrical-service-entrance]])
+- the medium-voltage switchgear, primary switch, or service equipment upstream of the transformer ([[sync/medium-voltage-switchgear]], [[sync/metal-enclosed-interrupter-switchgear]])
- the switchboards and panelboards downstream of the transformer ([[sync/low-voltage-switchboards]], [[sync/panelboards]])
- the primary and secondary cables and their raceways ([[sync/medium-voltage-cables]], [[sync/conductors-and-cables]], [[sync/raceways-and-conduit]])
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### The system bonding jumper and the grounding electrode conductor shall be installed at the location selected and at no other point, and the neutral shall not be bonded to the equipment grounding system anywhere downstream of that point.
−### Where the transformer secondary constitutes the service, the grounded conductor and the grounding electrode connections shall comply with NEC 250.24 and with [[sync/electrical-service-entrance]].
+### Where the transformer secondary constitutes the service, the grounded conductor and the grounding electrode connections shall comply with NEC 250.24 and with [[sync/grounding-and-bonding]].
### Where the X0 bushing is furnished with a removable strap and the system bonding jumper is located downstream, the strap shall be removed before energization and its removal recorded on the as-built documents.
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## Spare parts shall be of the same manufacturer and rating as the installed items, shall be delivered in their original packaging, and shall be labeled with the equipment designation of the unit they serve.