Junction box
IEC 60617 / instrument and electrical layout practice
Drawn as
A small square marked "JB" with cables entering it.
Meaning
Field junction box (Ex e) where field cables meet multicore cables. Usually on loop and layout drawings, not P&IDs. Becomes junction-box.
Variants
- Instrument JBs and power JBs are told apart by the tag (IJB, EJB)
Tags
JB