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          This standard covers the requirements for three-phase unit substations for step-down operation in the range of 112.5 kVA through 10 000 kVA at primary voltages of 601 volts through 38 kilovolts.<br />\n
          1.2<br />\n
          The standard is intended for use as the basis for the coordination of equipment by assisting in the selection of components. A variety of designs for unit substations are possible using various combinations of incoming sections, transformer sections, outgoing sections, and transition (throat) sections. Since the transformer section determines the kVA and voltage capabilities of a unit substation, the ratings of the various types of unit substations are described in terms of transformer capability.<br />\n
          1.3<br />\n
          This standard does not cover the following installations:<br />\n
          1) Substations in which the transformer section includes load-tap-changing equipment<br />\n
          2) Substations in which the transformer section is described and defined as &quot;network,&quot; &quot;subway,&quot; &quot;vault,&quot; or &quot;underground&quot; in American National Standards C57.12.24-1989, C57.12.40-1982, and C57.12.57-19871<br />\n
          3) Substations in which the transformer section is described and defined as &quot;pad-mounted&quot; in American National Standards C57.12.22-1989, C57.12.26-1987, and C57.12.271<br />\n
          4) Substations with gas-insulated equipment, such as substations insulated with SF6, described in ANSI/IEEE C37.122-19891<br />\n
          5) Rectifier-type substations<br />\n
          6) Mobile substations<br />\n
          7) Installations in ships, watercraft, railway rolling stock, aircraft, or automotive vehicles other than mobile homes and recreational vehicles<br />\n
          8) Installations for mines<br />\n
          9) Installations of railways for generation, transformation, transmission, or distribution of power used exclusively for operation of rolling stock, or for installations used exclusively for signaling and railway communication purposes.<br />\n
          10) Installations of communication equipment that is under the exclusive control of communication utilities, located outdoors or in building spaces used exclusively for such installations.<br />\n
          11) Installations under the exclusive control of electric utilities for the purpose of communication, or metering; or for the generation, control, transformation, transmission, and distribution of electric energy located in buildings used exclusively by utilities for such purposes or located outdoors on property owned or leased by the utility or on public highways, streets, roads, etc; or outdoors by established rights on private property.<br />\n
          1.4<br />\n
          It is intended that the incoming, outgoing, transformer, and transition sections included in a unit substation shall meet the basic requirements of applicable industry standards for those sections. In addition, these sections shall meet any<br />\n
          additional requirements imposed by this standard when they are used as part of a unit substation.
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          The standard is intended for use as the basis for the coordination of equipment by assisting in the selection of components. A variety of designs for unit substations are possible using various combinations of incoming sections, transformer sections, outgoing sections, and transition (throat) sections. Since the transformer section determines the kVA and voltage capabilities of a unit substation, the ratings of the various types of unit substations are described in terms of transformer capability.<br />\n
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        #name: "IEEE C37.20.1:2015"
        #slug: "ieee-c37-20-1-2015-ieee00005963-243002"
        #description: """
          Revision Standard - Active.<br />\n
          Metal-enclosed, low-voltage switchgear—which contains either stationary or drawout, manually or electrically operated low-voltage ac or dc power circuit breakers in individual metal compartments, in three-pole, four-pole, two-pole, or single-pole construction—is covered. Rated maximum voltage levels are 254 V, 508 V, 635 V, 730 V, or 1058 Vac; and 300/325 V, 600 V, 800 V, 1000 V, 1200 V, 1500 V, 1600 V, or 3200 Vdc. The preferred continuous current ratings of the main bus in ac designs are 1600 A, 2000 A, 3000 A, 3200 A, 4000 A, 5000 A, 6000 A, 8000 A, or 10 000 A. For dc designs, the preferred ratings are 1600 A, 2000 A, 2500 A, 3000 A, 4000 A, 5000 A, 6000 A, 8000 A, 10 000 A, or 12 000 A. The switchgear may also contain associated control, instruments, metering, protective, and regulating devices as necessary. The standard deals with service conditions, ratings, temperature limitations, and classification of insulating materials, insulation (dielectric) withstand voltage requirements, test procedures, and application.<br />\n
          \t\t\t\t<br />\n
          This standard covers metal-enclosed low-voltage power circuit breaker switchgear assemblies containing, but not limited to, such devices as low-voltage power circuit breakers (fused or unfused), other interrupting devices, switches, control, instrumentation, and metering, and protective and regulating equipment.<br />\n
          This standard is concerned with enclosed, rather than open, indoor and outdoor switchgear assemblies. It includes types of equipment that are part of secondary unit substations. It does not apply to equipment covered by industrial control standards, communication switchboards, communication switching equipment, switchboards for use on board ships, or dead-front distribution switchboards.<br />\n
          In this standard, metal-enclosed low-voltage power circuit breaker switchgear shall be called LV switchgear. For LV ac switchgear, the nominal system voltage shall be 1000 Vac or below; for LV dc switchgear, the rated maximum voltage shall be 3200 Vdc or below.
          """
        #metaKeywords: null
        #metaDescription: null
        #shortDescription: "IEEE Standard for Metal-Enclosed Low-Voltage (1000 Vac and below, 3200 Vdc and below) Power Circuit Breaker Switchgear"
        -notes: "Active"
      }
    ]
    #currentLocale: "en_US"
    #currentTranslation: null
    #fallbackLocale: "en_US"
    #variantSelectionMethod: "match"
    #productTaxons: Doctrine\ORM\PersistentCollection {#135685 …}
    #channels: Doctrine\ORM\PersistentCollection {#135678 …}
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    -apiLastModifiedAt: DateTime @1754517600 {#135652
      date: 2025-08-07 00:00:00.0 Europe/Paris (+02:00)
    }
    -lastUpdatedAt: DateTime @1578006000 {#135700
      date: 2020-01-03 00:00:00.0 Europe/Paris (+01:00)
    }
    -author: ""
    -publishedAt: DateTime @1436738400 {#135659
      date: 2015-07-13 00:00:00.0 Europe/Paris (+02:00)
    }
    -releasedAt: null
    -confirmedAt: null
    -canceledAt: DateTime @1436738400 {#135672
      date: 2015-07-13 00:00:00.0 Europe/Paris (+02:00)
    }
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    -pageCount: 84
    -documents: Doctrine\ORM\PersistentCollection {#135691 …}
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  +appearance: "state-active"
  +labels: [
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  -stateAttributeCode: "state"
  -localeContext: Sylius\Component\Locale\Context\CompositeLocaleContext {#1833 …}
}

[
  "product" => App\Entity\Product\Product {#135693
    #id: 11350
    #code: "IEEE00005963"
    #attributes: Doctrine\ORM\PersistentCollection {#135676 …}
    #variants: Doctrine\ORM\PersistentCollection {#135674 …}
    #options: Doctrine\ORM\PersistentCollection {#135669 …}
    #associations: Doctrine\ORM\PersistentCollection {#135671 …}
    #createdAt: DateTime @1751039648 {#135666
      date: 2025-06-27 17:54:08.0 Europe/Paris (+02:00)
    }
    #updatedAt: DateTime @1754608190 {#135701
      date: 2025-08-08 01:09:50.0 Europe/Paris (+02:00)
    }
    #enabled: true
    #translations: Doctrine\ORM\PersistentCollection {#135687 …}
    #translationsCache: [
      "en_US" => App\Entity\Product\ProductTranslation {#135789
        #locale: "en_US"
        #translatable: App\Entity\Product\Product {#135693}
        #id: 40409
        #name: "IEEE C37.20.1:2015"
        #slug: "ieee-c37-20-1-2015-ieee00005963-243002"
        #description: """
          Revision Standard - Active.<br />\n
          Metal-enclosed, low-voltage switchgear—which contains either stationary or drawout, manually or electrically operated low-voltage ac or dc power circuit breakers in individual metal compartments, in three-pole, four-pole, two-pole, or single-pole construction—is covered. Rated maximum voltage levels are 254 V, 508 V, 635 V, 730 V, or 1058 Vac; and 300/325 V, 600 V, 800 V, 1000 V, 1200 V, 1500 V, 1600 V, or 3200 Vdc. The preferred continuous current ratings of the main bus in ac designs are 1600 A, 2000 A, 3000 A, 3200 A, 4000 A, 5000 A, 6000 A, 8000 A, or 10 000 A. For dc designs, the preferred ratings are 1600 A, 2000 A, 2500 A, 3000 A, 4000 A, 5000 A, 6000 A, 8000 A, 10 000 A, or 12 000 A. The switchgear may also contain associated control, instruments, metering, protective, and regulating devices as necessary. The standard deals with service conditions, ratings, temperature limitations, and classification of insulating materials, insulation (dielectric) withstand voltage requirements, test procedures, and application.<br />\n
          \t\t\t\t<br />\n
          This standard covers metal-enclosed low-voltage power circuit breaker switchgear assemblies containing, but not limited to, such devices as low-voltage power circuit breakers (fused or unfused), other interrupting devices, switches, control, instrumentation, and metering, and protective and regulating equipment.<br />\n
          This standard is concerned with enclosed, rather than open, indoor and outdoor switchgear assemblies. It includes types of equipment that are part of secondary unit substations. It does not apply to equipment covered by industrial control standards, communication switchboards, communication switching equipment, switchboards for use on board ships, or dead-front distribution switchboards.<br />\n
          In this standard, metal-enclosed low-voltage power circuit breaker switchgear shall be called LV switchgear. For LV ac switchgear, the nominal system voltage shall be 1000 Vac or below; for LV dc switchgear, the rated maximum voltage shall be 3200 Vdc or below.
          """
        #metaKeywords: null
        #metaDescription: null
        #shortDescription: "IEEE Standard for Metal-Enclosed Low-Voltage (1000 Vac and below, 3200 Vdc and below) Power Circuit Breaker Switchgear"
        -notes: "Active"
      }
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    -author: ""
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      date: 2015-07-13 00:00:00.0 Europe/Paris (+02:00)
    }
    -releasedAt: null
    -confirmedAt: null
    -canceledAt: DateTime @1436738400 {#135672
      date: 2015-07-13 00:00:00.0 Europe/Paris (+02:00)
    }
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    -coreDocument: "C37.20.1"
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    -documents: Doctrine\ORM\PersistentCollection {#135691 …}
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  }
]