Safety rules and national safety instructions (NSI) guidance notes

Our safety rules are provided to make sure work can be carried out safely on or near electrical and mechanical equipment. We publish them for third-party companies with authorised staff, distribution network operators (DNOs) and generator operators.

Electricity authorisation training (competent/authorised person)

We provide essential primary safety training to our contractors who need access to high voltage compounds and routes. 

This scheme operates to satisfy the requirements of National Safety Instruction (NSI) 30 "Appointment of Persons". This procedure describes the process for the appointment of persons of both company and non-company personnel under the National Grid Safety Rules. 

The training for non-company personnel is administered by our Learning and Development department based in Eakring, Nottinghamshire. 

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National safety instructions

Published Sort ascending Name
NSI 05: Cable systems [NGUK/PM/ETSR/NSI/05/ISSUE 2]
NSI 30: Appointment of persons [NGUK/PM/ET SR/NSI/30/GN Issue 3]
NSI 01: Operational and safety switching [NGUK/PM/ETSR/NSI/01/GN Issue 6]
NSI 12: Low Voltage Equipment [NGUK/PM/ETSR/NSI/12/GN Issue 2]
NSI 27:Work on or near to High Voltage Direct Current [NGUK/PM/ETSR/NSI/27/GN Issue 1]
NSI 26: Railway Connection Circuits [NGUK/PM/ETSR/NSI/26/GN Issue 3]
NSI 33: The addition/removal of equipment to/from the system [NGUK/PM/ET SR/NSI/33/GN Issue 2]
NSI 08: Mobile elevated work platforms, lorry loaders, vehicles, cranes and objects in substations guidance [NGUK/PM/ETSR/NSI/08/GN Issue 4]
NSI 02: Earthing high voltage equipment [NGUK/PM/ETSR/NSI/02/GN Issue 9]
NSI 06: Demarcation in substations [NGUK/PM/ETSR/NSI/06/GN Issue 4]
NSI 00: National Safety Instruction Index [NGUK/PM/ETSR/NSI/0/Issue 29]
NSI 17: Pressure systems [NGUK/PM/ETSR/NSI/17/GN Issue 2]
NSI 02: Appendix A.10 v6
NSI 31: Approval/withdrawal of procedures for National Grid electricity safety rules and supporting documentation [NGUK/PM/ETSR/NSI/31GN Issue 1]
NSI 32: Register of approvals for procedures for the use on the electricity transmission system [NGUK/PM/ETSR/NSI/32GN Issue 1]
NSI 24: Modification or Repair of Earth Conductors on Main Earth Systems [NGUK/PM/ETSR/NSI/24GN Issue 2]
NSI 09: Testing high voltage equipment [NGUK/PM/ETSR/NSI/09/GN Issue 2]
NSI 13: Washing high voltage insulators [NGUK/PM/ETSR/NSI/13/GN Issue 1]
NSI 03: High Voltage Metal Clad Switchgear with Spouts [NGUK/PM/ETSR/NSI/03/GN Issue 2]
NSI 10: Equipment containing sulphur hexafluoride (Sf6) [NGUK/PM/ETSR/NSI/10/GN Issue 4]
NSI 14: Automatically and/or remotely controlled equipment [NGUK/PM/ETSR/NSI/14/GN Issue 2]
NSI 04: Work on or near high voltage overhead lines [NGUK/PM/ETSR/NSI/04/GN Issue 5]
NSI 11: High voltage static capacitor banks [NGUK/PM/ETSR/NSI/11/GN Issue 3]