What is the Purpose of Junction box Drawing?

Junction box is an intermediate between instrument and control panel. Junction box is an electrical box which contains terminal blocks.

The cables from the instruments come to one side of the terminal block and from the other end it goes to the control panel.

JB drawing shows instrument and its terminal numbers which are to be connected, instrument cable number, junction box number, terminal number assigned for the specified instrument,multi-pair cable and pair number , marshaling cabinet number, terminal number in marshaling cabinet.

1 Like