National Grid Electricity plc Safety Rules and National Safety Instruction (NSI) Guidance Notes

The National Grid Safety Rules are provided to ensure that work can be undertaken safely on or near electrical and mechanical equipment. They are published for a target audience of third party companies with staff authorised to National Grid Safety Rules, Distribution Network Operators and Generator Operators.

Register for email alerts to be notified when these files are amended.

* Denotes document containing both rules and guidance.

 

Safety Rules

04 April 2011
The Electricity Transmission Safety Rules 3rd Edition
NGUK/PL/ETSR/Issue 3.01. Yellow highlights mark changes from the previous version.
863 KB
04 April 2011
The Electricity Transmission Safety Rules Guidance
776 KB

National Safety Instructions

01 December 2011
NSI 0: National Safety Instruction Index
NGUK/PM/ETSR/NSI/0 Issue 22
53 KB
04 April 2011
NSI 1: Operational and safety switching
NGUK/PM/ETSR/NSI/01 Issue 3
354 KB
04 April 2011
NSI 2: Earthing high voltage equipment
NGUK/PM/ETSR/NSI/02/GN Issue 4
1991 KB
29 April 2011
NSI 3: High Voltage Metal Clad Switchgear with Spouts
NGUK/PM/ETSR/NSI/03/GN Issue 1
1553 KB
04 April 2011
NSI 4: Work on or near high voltage overhead lines
NGUK/PM/ETSR/NSI/04/GN Issue 4
9947 KB
01 August 2005
NSI 5: Cable systems
Issue 5
2679 KB
04 April 2011
NSI 6: Demarcation in substations
NGUK/PM/ETSR/NSI/06/GN Issue 2
9313 KB
04 April 2011
NSI 8: Mobile elevated work platforms, lorry loaders, vehicles, cranes and objects in substations guidance
NGUK/PM/ETSR/NSI/08/GN Issue 2 *
275 KB
31 January 2011
NSI 9: Testing high voltage equipment
NGUK/PM/ETSR/NSI/09/GN Issue 1 *
62 KB
04 April 2011
NSI 10: Equipment containing sulphur hexafluoride (Sf6)
NGUK/PM/ETSR/NSI/10/GN Issue 2 *
146 KB
04 April 2011
NSI 11: High voltage static capacitor banks
NGUK/PM/ETSR/NSI/11/GN Issue 2 *
340 KB
01 December 2011
NSI 12: Low Voltage Equipment NGUK/PM/ETSR/NSI/12/GN
Issue 1
243 KB
02 January 1995
NSI 13: Washing high voltage insulators
Issue 1
39 KB
01 September 2010
NSI 14: Automatically and/or remotely controlled equipment
NGUK/PM/ETSR/NSI/14/GN Issue 1
61 KB
12 November 2010
NSI 17: Pressure systems
NGUK/PM/ETSR/NSI/17/GN Issue 1*
1439 KB
01 December 2011
NSI 24: Modification or Repair of Earth Conductors on Main Earth Systems NGUK/PM/ETSR/NSI/24/GN
Issue 1
471 KB
04 April 2011
NSI 30: Appointment of persons
NGUK/PM/ETSR/NSI/30 Issue 8
294 KB
01 July 2007
NSI 31: Approval of procedure for National Grid electricity safety rules
Issue 1
34 KB
01 November 1995
NSI 32: Register of approvals
Issue 1
40 KB
01 February 2007
NSI 33: The addition/removal of equipment to/from the system
Issue 6
95 KB
 

Many of the files available to download on this page are Acrobat PDF files. To access these you will need Acrobat Reader which is available from the Adobe web site.