Nonstandard abbreviations on electrical prints will generally be explained on the legend.
The PT is typically described by its voltage balance from primary to secondary. A 600:120 PT will deliver an output voltage of 120 volts when 600 volts are engraved across its primary winding.
A motor control center (MCC) is an group to control some or all electric motors in a central location. It consists of multiple enclosed regions having a common power bus and with each section having a combination starter, which in turn consists of a motor starter, circuit breaker, and power disconnect.
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