When the disconnecting means of a transformer is remote, what requirement must it meet?

When the disconnecting means of a transformer is located remotely, it must be lockable. This requirement ensures that the disconnect can be secured in the off position, which increases safety during maintenance or emergencies. By allowing personnel to lock the disconnect, it prevents accidental re-energization of the transformer while someone is working on it. Lockable disconnects are a critical safety feature as they help protect workers from electric shock or other hazards.

Accessibility is also important, but the primary reason for a disconnecting means to be lockable is to ensure safety during maintenance operations. While weatherproofing can be a consideration depending on the location of the disconnect, the core requirement for remote disconnects focuses on their ability to be secured (lockable) to prevent unauthorized or accidental access. Color coding may aid in identifying the disconnect but does not meet the essential safety requirement that lockability provides.