Instrument Junction Boxes (commonly referred to as JBs) are an integral part of every control and instrumentation installation. They protect electrical connections from the weather, help prevent operators and technicians from suffering accidental electric shocks, and offer a convenient entry into a circuit for maintenance and fault finding.

In this article we will look at the considerations and options available when specifying a junction box, and also at some of the documentation used by instrument designers and technicians relating to Junction Boxes.