Primary and secondary power distribution systems (layouts explained)
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Secondary unit substations design guide - Eaton
An ATC uses a cable connection on either the primary side, secondary side or both, and is placed between the transformer and the remotely mounted primary or secondary equipment.
Secondary Substation Installation and SUB-02-006 2. ISSUE RECORD
Other combinations of directly mounted attachments to the transformer (e.g. cable box in lieu of HV switchgear or LV fuse cabinet) shall only be installed where formal written approval has been given
Technical note
This reference is intended for preliminary specialty-cable research. Compatibility, link budgets, fire performance, installation methods, test limits and applicable standards must be verified for the specific project.