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What are the preferred entended (extra) depths for 5/15kV HVL switchgear enclosures, both indoor and outdoor?

Indoor extra depths: 62.5``, 66.5``, 70.5``, 74.5``, 75`` and 78.5``. Standard Depth is 54.5``
75`` depth is preferred if a transformer connection is in the lineup. More than 4 cables per phase requires extra depth.
Outdoor extra depth: 80.0``. Standard Depth is 60.0``

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