Tagging of the junction box, cables, and cable drums is very important during front-end engineering design for the preparation of the JB schedule, cable schedule, cable drum schedule, etc.
In this article, we are going to discuss the tagging philosophy for junction boxes, cables, and cable drums.
The given above is the basic structure of junction Box tagging philosophy
It includes,
Refer to the below article for details regarding the unit number
Each junction box is associated with an instrumented facility comprising of a series of letters depicting that junction box details based on the type of signals.
Below table indicates some of the junction box types
LETTER | TYPE OF SIGNAL |
JBA | Alarm (BPCS) |
JBE | Analogue (BPCS) |
JBS | Control – Solenoid Outputs (BPCS) |
JBFF | Fieldbus Foundation (BPCS) |
JBAX | Alarm (SIS) |
JBEX | Analogue (SIS) |
JBSX | Control – Solenoid Outputs (SIS) |
JBAF | Alarm (F&G) |
JBEF | Analogue (F&G) |
JBPF | Power (F&G) |
Also Read: Instrumentation Project Documents
Reference drawings required for the preparation of the JB Schedule are
The below discussed the different ways where we used the cable tagging.
Individual cables running between field instruments and junction boxes are normally identified by the instrument tag number itself.
Example:
The below image shows the basic structure of cable tagging for cables from the junction box to the control room.
It includes,
Reference drawings required for the preparation of the cable schedule are
Given above is the basic structure of the Instrument cable drum numbering system.
It includes,
Cable code indicates all details regarding that cable type. There is always a description associated with each cable code.
Given below is an example of cable type and description
Zone details and subcontractor details are entered as per the project execution details.
Reference drawings required for the preparation of cable drum schedule are,
Author: Greeshmesh TP
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