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Medium Voltage / Premium Content / Testing and Commissioning

My experience in the design and installation of medium voltage switchgears

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Home / Technical Articles / My experience in the design and installation of medium voltage switchgears

Design and installation guidelines

Medium Voltage (MV) switchgear is typically any switchgear over 1000V in the United States (US). Some of the nominal voltage ratings used in the US by power utilities are 2.4-4.16kV, 7.2kV, 13.8kV, 14.4kV, 23kV, 34.5kV and so on. The design of MV system is complicated and is closely controlled by local utilities.

My experience and issues during the design and installation of medium voltage switchgear
My experience and issues during the design and installation of medium voltage switchgear (photo credit: avidgroup.net)

So, while this guide gives you an overview and covers various topics, a dialogue with the local utility is essential to identify which requirements, if any described below, they would like for you to follow.

Table of contents:

  1. Position of MV switchgear in the electrical system
  2. Cable ducts
  3. Cables
  4. Manholes
  5. Splices
  6. Transformer(s)
  7. Overcurrent Protective Device (OCPD) coordination and short circuit study
  8. Incoming feeders
  9. Grounding
  10. Relay protections
  11. Tests
  12. Contingencies

1. Position in the electrical system

The MV switchgear is upstream of your low voltage (LV) gear. However, there are two ways that you might deal with MV switchgear:

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Amar M

Electrical engineer specializing in the complete lifecycle (concept through to construction) of LV/MV designs as they pertain to the power requirements of various building types such as commercial, physical sciences, pharmaceutical, and others.

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