NR/L3/ELP/SAI25 Forms
NR/L3/ELP/SAI25 working on about overhead line equipment (SAI) has been expanded to cover the Routes in Scotland’s Railway and Southern in addition to North West & Central and Eastern Regions. The current phase introduces an enhanced electrical risk assessment and clarification on the management of distribution interfaces.
Where introduced, it replaces NR/L3/ELP/29987 – known as the ‘Green Book’.
There are some new and amended forms which are to be used to implement the requirements of SAI25. Publication and updates of these forms will be managed outside the Network Rail Standards and Controls website on this page of Safety Central. As a consequence, they no longer have an NR/L3 prefix. Instead they start with ELP/SAI25/.
This site contains the approved forms for use and is updated as required. For the standard and modules, please visit the Standard and Controls website.
Use this site for the current approved forms associated with SAI25.
Latest Update
Where a form has been updated it shall be used from the publication date.
SAI Forms Update 13 March 2026
Issue 2B Updates of ESSOW Category L & Category E tasks (narrated video)
Forms
| Form reference number | Issue | Description of form | Status |
|---|---|---|---|
| ELP/SAI25/AE | 1A | Blocking of Lines for Electric Traction Purposes | |
| ELP/SAI25/AS | 1A | Blocking of Lines for Electric Traction Purposes | |
| ELP/SAI25/AT | 1A | Blocking of Lines for Electric Traction Purposes | |
| ELP/SAI25/B | 1B | Form B: Authority to Test and Apply Portable Earths and Reminder of Live Exposed Equipment to Overhead Line Equipment Including Return Conductors and Autotransformer Feeders | |
| ELP/SAI25/CT | 1A | Declaration of Isolation at Pelaw TPH Coast-Through Section Insulators Forming Boundary Between Electrical Control Areas | |
| ELP/SAI25/EIDF | 1B | Earthed Isolation Details Form | |
| ELP/SAI25/ERAF | 2D | Electrical Risk Assessment Form | |
| ELP/SAI25/IPF | 1A | Isolation Planning Form | |
| ELP/SAI25/LWF | 1A | Live Working Form | |
| ELP/SAI25/N | 1A | Declaration of Switched-off OLE at Neutral Section Forming Boundary between Electrical Controls | |
| ELP/SAI25/NC | 1A | Network Rail / Other Third Party Electrification Systems Declaration of Switched-Off OLE at Neutral Section Forming Boundary at Interface Between Network Rail and Other Third Party Electrification Systems | |
| ELP/SAI25/OLP | 2A | Overhead Line Permit | |
| ELP/SAI25/ORF | 1C | Outage Request Form | |
| ELP/SAI25/SDF | 1A | Electrical Control Room Switching Details | |
| ELP/SAI25/STED | 1A | Switching, Testing, Earthing Details Form | |
| ELP/SAI25/SVF | 2A | Category L – Site Visit Form | |
| ELP/SAI25/TC | 1A | Declaration of Switched-off OLE at Section Insulator Forming Boundary between Network Rail & Supertram | |
| ELP/SAI25/X/GBSIP/B | 1A | Authority to Test and Apply Portable Earthsand Reminder of Live Exposed Equipment to Overhead Line Equipment Including Return Conductors and Authotransformer Feeders in GBSIP areas | |
| ELP/SAI25/X/GBSIP/STED | 1A | Switching, Testing, Earthing Details in GBSip areas | |
| ELP/SAI25/Cat E | 2B | Approved Live Working Tasks | UPDATED |
| ELP/SAI25/Cat L | 2B | Electrical Safe System of Work (ESSoW) – Category L: List of approved Low Electrical Risk work activities | UPDATED |
| ELP/SAI25 |
Contact
These documents are controlled by the Technical Authority Chief M&E Engineer’s team.
In the event of any queries please contact either Matt.Skinner@networkrail.co.uk or Ruth.Thomas@networkrail.co.uk