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This is a snapshot from a single-line diagram of emergency switchboard drawn in 1984 for an oil & gas project.

What are these two components next to the motor symbol? What could CP stand for? What is the rectangle with a black dot?

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The * note states

* -CONTROLS WIRED IN MULTICORE TO MARSHALLING COMPARTMENT.

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    \$\begingroup\$ Most diagrams come with a legend - which might answer most of your questions. \$\endgroup\$
    – Solar Mike
    Commented Sep 9, 2021 at 7:15
  • \$\begingroup\$ If there is such a legend diagram, it is sadly not accessible at the moment. \$\endgroup\$
    – Corentin Pane
    Commented Sep 9, 2021 at 7:24
  • \$\begingroup\$ Did you get this from a book or manual? \$\endgroup\$
    – Solar Mike
    Commented Sep 9, 2021 at 7:25
  • \$\begingroup\$ The look of the box + dot kinda suggests an emergency stop button for an NVR switch. (Then, Could CP be a control panel, somewhere else, needing a remote stop for safety?) \$\endgroup\$
    – user16324
    Commented Sep 9, 2021 at 14:15

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You need a legend from the drawing from the project plan package. The location of the box near the motor suggests that the symbol in question is a transducer that is monitoring the motor. It could be a thermocouple. The symbol could also designate a group of transducers such as motor winding temperature, shaft rotation, air flow. The designation CP likely means control panel.

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  • \$\begingroup\$ If HVAC is of any importance it might be a room temperature sensor for the ventilation to work on. \$\endgroup\$
    – Jeroen3
    Commented Sep 9, 2021 at 13:37

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