Safety documentation for electricity workers
National Safety Instructions (NSI's) supplement the safety rules are used to provide detailed requirements and roles and responsibilities for authorised staff under the safety rules.
* Contains both rules and guidance.
National Safety Instructions
01 December 2011
NSI 0: National Safety Instruction Index
NGUK/PM/ETSR/NSI/0 Issue 22
04 April 2011
NSI 1: Operational and safety switching
NGUK/PM/ETSR/NSI/01 Issue 3
04 April 2011
NSI 2: Earthing high voltage equipment
NGUK/PM/ETSR/NSI/02/GN Issue 4
29 April 2011
NSI 3: High Voltage Metal Clad Switchgear with Spouts
NGUK/PM/ETSR/NSI/03/GN Issue 1
04 April 2011
NSI 4: Work on or near high voltage overhead lines
NGUK/PM/ETSR/NSI/04/GN Issue 4
01 August 2005
NSI 5: Cable systems
Issue 5
04 April 2011
NSI 6: Demarcation in substations
NGUK/PM/ETSR/NSI/06/GN Issue 2
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 *
31 January 2011
NSI 9: Testing high voltage equipment
NGUK/PM/ETSR/NSI/09/GN Issue 1 *
04 April 2011
NSI 10: Equipment containing sulphur hexafluoride (Sf6)
NGUK/PM/ETSR/NSI/10/GN Issue 2 *
04 April 2011
NSI 11: High voltage static capacitor banks
NGUK/PM/ETSR/NSI/11/GN Issue 2 *
01 December 2011
NSI 12: Low Voltage Equipment NGUK/PM/ETSR/NSI/12/GN
Issue 1
02 January 1995
NSI 13: Washing high voltage insulators
Issue 1
01 September 2010
NSI 14: Automatically and/or remotely controlled equipment
NGUK/PM/ETSR/NSI/14/GN Issue 1
12 November 2010
NSI 17: Pressure systems
NGUK/PM/ETSR/NSI/17/GN Issue 1*
01 December 2011
NSI 24: Modification or Repair of Earth Conductors on Main Earth Systems NGUK/PM/ETSR/NSI/24/GN
Issue 1
04 April 2011
NSI 30: Appointment of persons
NGUK/PM/ETSR/NSI/30 Issue 8
01 July 2007
NSI 31: Approval of procedure for National Grid electricity safety rules
Issue 1
01 November 1995
NSI 32: Register of approvals
Issue 1
01 February 2007
NSI 33: The addition/removal of equipment to/from the system
Issue 6
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