63 lines
1.6 KiB
Markdown
63 lines
1.6 KiB
Markdown
---
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id:
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aliases:
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- nec-450
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tags:
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- authorship/other
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- destiny/uncertain
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- status/incomplete
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- topic/electrical
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- type/encyclopedia
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title: Article 450 Transformers and Transformer Vaults (Including Secondary Ties)
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---
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# Article 450 Transformers and Transformer Vaults (Including Secondary Ties)
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## Part I. General Provisions
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### 450.1 Scope.
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This article covers the installation of all transformers.
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Exception No. 1:
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Current transformers.
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Exception No. 2:
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Dry-type transformers
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that constitute a component part of other apparatus
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and comply with the requirements for such apparatus.
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Exception No. 3:
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Transformers that are an integral part
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of an X-ray, high-frequency, or electrostatic-coating apparatus.
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Exception No. 4:
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Transformers used with Class 2 and Class 3 circuits
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that comply with Article 725.
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Exception No. 5:
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Transformers for sign and outline lighting
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that comply with Article 600.
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Exception No. 6:
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Transformers for electric-discharge lighting
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that comply with Article 410.
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Exception No. 7:
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Transformers used for power-limited fire alarm circuits
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that comply with Part III of Article 760.
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Exception No. 8:
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Transformers used for research, development, or testing,
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where effective arrangements are provided
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to safeguard persons from contacting energized parts.
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This article covers the installation of transformers
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dedicated to supplying power to a fire pump installation
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as modified by Article 695.
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This article also covers the installation of transformers
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in hazardous (classified) locations
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as modified by Articles 501 through 504.
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