What is Instrument location layout and Junction box location layout?

What is an instrument location layout?
Instrument location layout is a layout which indicates the exact location of instrument/junction box, trench/trays etc.
Trench and duct is the path for primary cable and tray is the path for secondary cables. Tray is either made of metals or FRP (Fiber reinforced plastic).
What is Junction box and Junction box location 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. As I mentioned in previous post cables from the control panel is called primary cables. Usually multi core cables are used as primary cable. Cables to the instruments are called primary cables. Usually single core cables are used as secondary cable.

Terminal block

Typical example of a junction box
What is the purpose of a Junction box?
Purpose of a Junction box is to give convenience and protection for cabling between instrument and control panel. In maintenance point of view junction box is very much important. It helps very much in trouble shooting. Below I am giving an example of Junction box location drawing.For proper entry of cables to the JB, Jb arches are used. Cables are entering to the JB through cable glands. Cable gland is used for the proper placing of cable. Different types of cable glands are available.

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