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1Repair Windows errors before they cause bigger problems2Scan for outdated or missing drivers - takes under a minute3Clear out junk files and repair common Windows errors38 kV identifies a switchgear voltage class or rated maximum-voltage capability; it does not, by itself, tell you the data center’s nominal service voltage or whether a particular lineup is suitable. Selection also depends on the utility connection, load and fault studies, insulation, construction, protection, environment, and project requirements.
What the 38 kV designation tells you
It describes an equipment voltage rating, not a complete electrical design. IEEE C37.20.2-2025 covers metal-clad medium-voltage switchgear with drawout electrically operated circuit breakers and grounded metal barriers between equipment compartments. Its active standard page lists rated maximum voltage levels from 4.76 kV through 48.3 kV and several main-bus current ratings. Those are separate ratings: the voltage class alone does not specify a lineup’s current capacity, interruption capability, or insulation level.
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| Published specification | What it establishes |
|---|---|
| IEEE C37.20.2-2025 scope | Rated maximum voltage levels from 4.76 kV through 48.3 kV; main-bus continuous-current ratings of 1,200 A, 2,000 A, 3,000 A, and 4,000 A. IEEE Standards Association |
| Eaton medium-voltage power-center offering | Published product-specific maxima include 38 kV rated maximum voltage, 4,000 A continuous current, 63 kA rms symmetrical interrupt rating, and 150 kV peak basic impulse level (BIL). These are Eaton offering specifications, not universal requirements or guaranteed values for every configuration. Eaton |
Use the exact offered lineup’s nameplate data and documentation rather than assuming that all equipment labeled 38 kV shares the same current, fault, insulation, or construction ratings.
How a 38 kV class relates to a 34.5 kV service
Service voltage and switchgear rated maximum voltage are related but different values. Eaton’s design guide includes a 34.50 kV line-to-line service-voltage entry, illustrating why a project may specify equipment by its rated maximum voltage while the utility supplies a lower nominal system voltage. That example does not establish that every 38 kV installation serves a 34.5 kV system. Confirm the actual nominal voltage, grounding arrangement, frequency, available fault current, and interconnection conditions with the utility and project engineer. Eaton’s product material
Selection checks for a data center
Use 38 kV as an initial equipment-class filter, then specify the lineup from the site’s electrical design. Data-center substation planning includes grid interconnection, configurations, reliability and redundancy, and power-system studies; IEEE’s guide project page identifies these as relevant subjects. IEEE P4134
- Establish the utility interface. Get the utility’s service data and interconnection requirements, including nominal voltage, grounding, frequency, and available fault current.
- Determine continuous-current needs. Check projected loads and operating scenarios, transformer arrangement, ambient conditions, and planned growth. Voltage class does not select the bus or lineup current rating.
- Coordinate interruption and withstand duties. Use the utility fault level and system studies to specify short-circuit ratings and switching duty. Two lineups with the same voltage class need not have the same fault capability.
- Specify insulation and service conditions. Confirm required dielectric withstand/BIL, altitude, temperature, installation location, enclosure, and other applicable environmental conditions for the exact configuration.
- Define construction and protection. Specify metal-clad or other construction, breaker arrangement, compartments, relaying, metering, and controls to suit the protection and maintainability design. IEEE’s metal-clad standard scope describes compartmentalization and associated control, instrumentation, metering, relaying, protection, and regulating devices. IEEE C37.20.2-2025
- Assess arc resistance separately. A 38 kV rating does not imply arc-resistant construction. Eaton describes a 38 kV VacClad-W product certified Type 2 to IEEE C37.20.7; specify the classification and tested configuration the project requires, and confirm application conditions with the engineer and manufacturer. Eaton VacClad-W 38 kV product information
- Coordinate the complete substation. For a stepdown design, coordinate incoming, transformer, outgoing, and transition sections as a system. IEEE C37.121-2020 addresses unit-substation component coordination for primary voltages through 52 kV. IEEE C37.121-2020
- Make procurement evidence configuration-specific. State the applicable standard edition and required tests, certifications, drawings, settings, and commissioning evidence in the specification. Check that the offered nameplate ratings and tested features apply to the actual lineup—not just a related product variant.
What to compare when reviewing bids
Compare offers against the same project requirements rather than comparing the “38 kV” label alone. The relevant axes include utility voltage and system arrangement; continuous-current and short-circuit ratings; insulation level; construction and compartmentation; arc-resistant classification and tested accessibility type; enclosure and service conditions; breaker or switch arrangement; relaying, metering, and control; applicable standards and certifications; and provisions for expansion, reliability, maintainability, and commissioning. The project study and specification—not the voltage label—establish the required values.
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