Engineering Documents · Free Template
Instrument Junction Box Data Sheet Template
A data sheet for field instrument junction boxes, covering enclosure, protection ratings, terminals, earthing and gland entries.
Excel (.xlsx)Printable PDFFilled exampleFree, no sign up
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- How to Use sheet with steps
- Template sheet, blank and ready
- Example sheet, filled in
- Drop down lists for consistent entries
- A4 portrait print setup
- Works in Excel, Google Sheets and LibreOffice
Preview of the Filled Example
This is the Example sheet from the download, so you can see exactly how the completed instrument junction box data sheet looks.
ProjectBoiler 3 upgrade
RevisionA
Date24 Oct 2026
Requisition noREQ INST 038
Specification
| No | Parameter | Value | Unit / notes |
|---|---|---|---|
| General | |||
| 1 | Tag number | JB 2001 | |
| 2 | Area / location | Area 200, pipe rack | |
| 3 | Hazardous area | Zone 2, IIB T4 | |
| 4 | Signal type (analog, digital, IS, fieldbus) | Analog 4 to 20 mA, non IS | |
| Enclosure | |||
| 5 | Material | SS 316L | |
| 6 | Size (H x W x D) | 400 x 300 x 200 | mm |
| 7 | Ingress protection | IP66 | |
| 8 | Ex protection | Ex eb IIC T6 Gb | |
| 9 | Mounting | Wall / stand | |
| 10 | Door / cover | Hinged, padlockable | |
… and 13 more rows in the download.
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About the Instrument Junction Box Data Sheet
Junction boxes collect field cables into multicores. A clear data sheet prevents wrong Ex ratings, too few terminals and missing earth bars.
How to fill in this template
- Define location, area classification and signal type.
- Choose enclosure material, size, IP and Ex protection.
- Count terminals including spares and earth requirements.
- List gland entries by cable size.
- Add labelling and test requirements.
What the formulas do
- No formulas: specification document laid out in sections like an ISA 20 style data sheet.
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Frequently Asked Questions
Why separate IS and non IS?
IEC 60079-14 requires separation so energy cannot pass into IS circuits.
How many spare terminals?
Commonly about 20 %; follow your project specification.
Ex e or Ex d junction box?
Ex e (increased safety) is common for terminals; Ex d is used when devices inside can spark.
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