British Standards Institution

Sector: Sustainability

Overview: Under the direction of the Standards Policy and Strategy Committee, is responsible for the UK input to the work of IEC/TC99 and CLC/BTTF/62-3, CLC/TC99X, CLC/BTTF/128-2 on the Erection and Operation of Power Installations Exceeding 1kV a.c. (1,5 kV d.c.); and IEC/TC28 & CLC/SR28 for British standards in the field of Insulation Co-ordination for electrotechnical equipment; and IEC/PC 128 and CLC/BTTF 62-3 'Operation of electrical installation'.

Committee standards activity

In Progress (13)

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Reference	Standards description	Status ? The standards development process is divided into chronological stages: Proposal; Drafting; Public comment; Comment resolution; Approval; Published standard.
PNW TS 99-490 ED1:	Insulation co-ordination - Part 4: Computational guide to insulation co-ordination and modelling of electrical networks Categories: Information management \| Standardization. General rules Proposal begins : 2025-05-30	Proposal
PNW 99-402 ED1:	Insulation co-ordination Part 14: Insulation co-ordination for AC/DC filters of HVDC system Categories: Information management \| Standardization. General rules \| Engineering \| Electrical engineering \| Insulation \| Insulation systems Proposal begins : 2023-01-26	Proposal
PD IEC/TS 60071-4 Ed.1.0	Insulation co-ordination. Part 4: Computational guide to insulation co-ordination and modelling of electrical networks Categories: Unclassified documents Public comment begins :	Public comment
PD IEC/TR 60071-4 Ed.2.0	Insulation co-ordination. - Part 4: Computational guide to insulation co-ordination and modelling of electrical networks Categories: Insulation systems Public comment begins :	Public comment
PD IEC/TR 60071-15 ED1	Insulation co-ordination. Part 15: Insulation co-ordination for DC transmission lines Categories: Unclassified documents Public comment begins :	Public comment
PD IEC TS 63527:2025	Safe management and operation of electrical installations Categories: Electrical installations. Outdoor use \| Installations in buildings. General Approval begins :	Approval
New Work Item Proposal - EN 50110-1:2023/prA1	Operation of electrical installations - Part 1: General requirements Categories: Information management \| Standardization. General rules Proposal begins : 2025-07-21	Proposal
BS EN IEC 63478-2 ED1	BS EN 63478-2 ED1 User’s Quality of Experience (QoE) on Multimedia Conferencing Services. Part 2: Requirements Categories: Multimedia systems and teleconferencing equipment Public comment begins : 2024-09-03	Public comment
BS EN IEC 61936-1:2021/A11:2024	Power installations exceeding 1 kV AC and 1,5 kV DC. - Part 1: AC Categories: Electrical engineering. General \| Electrical insulation. General Public comment begins : 2024-02-02	Public comment
BS EN 60071-2 Ed.6.0	Insulation co-ordination. Part 2: Application guidelines Categories: Unclassified documents Drafting begins : 2025-11-06	Drafting

Published (40)

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Reference	Standards description	Status ? The standards development process is divided into chronological stages: Proposal; Drafting; Public comment; Comment resolution; Approval; Published standard.
PD IEC/TR 60071-4:2004	Insulation co-ordination. Computational guide to insulation co-ordination and modelling of electrical networks Categories: Insulation systems Published standard begins : 2005-01-05	Published standard
PD IEC TS 61936-0:2023	Power installations exceeding 1 kV AC and 1,5 kV DC. Principles to be observed in the design and erection of high voltage installations. Safety of high voltage installations Categories: Electrical engineering. General \| Electrical insulation. General Published standard begins : 2023-05-25	Published standard
BS EN IEC 61936-2:2023	Power installations exceeding 1 kV AC and 1,5 kV DC. DC Categories: Electrical insulation. General \| Electrical engineering. General Published standard begins : 2023-11-09	Published standard
BS EN IEC 61936-1:2021	Power installations exceeding 1 kV AC and 1,5 kV DC. AC Categories: Electrical engineering. General \| Electrical insulation. General Published standard begins : 2021-09-08	Published standard
BS EN IEC 60071-2:2023	Insulation co-ordination. Application guidelines Categories: Electrical insulation. General \| Insulation systems Published standard begins : 2023-09-22	Published standard
BS EN IEC 60071-12:2022	Insulation co-ordination. Application guidelines for LCC HVDC converter stations Categories: Insulation systems \| Insulation. Other Published standard begins : 2023-01-20	Published standard
BS EN IEC 60071-1:2019	Insulation co-ordination. Definitions, principles and rules Categories: Insulation systems Published standard begins : 2019-10-25	Published standard
BS EN 60071-5:2015	Insulation co-ordination. Procedures for high-voltage direct current (HVDC) converter stations Categories: Insulation systems Published standard begins : 2015-01-21	Published standard
BS EN 50522:2022+A1:2024	Earthing of power installations exceeding 1 kV a.c. Categories: Fuses. Overcurrent protection devices Published standard begins : 2024-11-06	Published standard
BS EN 50191:2010	Erection and operation of electrical test equipment Categories: Measurement. Electrical and magnetic quantities \| Testing. Electrical and electronic \| Electrical engineering. General Published standard begins : 2010-11-16	Published standard

Withdrawn (13)

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Reference	Standards description	Status ? The standards development process is divided into chronological stages: Proposal; Drafting; Public comment; Comment resolution; Approval; Published standard.
PD IEC/TS 61936-2:2015	Power installations exceeding 1 kV a.c. and 1,5 kV d.c. d.c. Categories: Electrical engineering. General \| Electrical insulation. General Withdrawn begins : 2023-11-09	Withdrawn
BS EN IEC 60071-2:2018	Insulation co-ordination. Application guidelines Categories: Electrical insulation. General \| Insulation systems Withdrawn begins : 2023-09-22	Withdrawn
BS EN IEC 60071-11:2022	Insulation co-ordination. Definitions, principles and rules for HVDC system Categories: Insulation systems Withdrawn begins : 2024-01-11	Withdrawn
BS EN 61936-1:2010+A1:2014	Power installations exceeding 1 kV a.c. Common rules Categories: Electrical engineering. General \| Electrical insulation. General Withdrawn begins : 2021-09-08	Withdrawn
BS EN 61936-1:2010	Power installations exceeding 1 kV a.c. Common rules Categories: Electrical engineering. General \| Electrical insulation. General Withdrawn begins : 2013-06-21	Withdrawn
BS EN 60071-1:2006+A1:2010	Insulation co-ordination. Definitions, principles and rules Categories: Insulation systems Withdrawn begins : 2010-04-20	Withdrawn
BS EN 60071-1:2006	Insulation co-ordination. Definitions, principles and rules Categories: Insulation systems Withdrawn begins : 2010-04-20	Withdrawn
BS EN 50522:2022	Earthing of power installations exceeding 1 kV a.c. Categories: Fuses. Overcurrent protection devices Withdrawn begins : 2024-11-06	Withdrawn
BS EN 50522:2010	Earthing of power installations exceeding 1 kV a.c. Categories: Fuses. Overcurrent protection devices Withdrawn begins : 2012-10-25	Withdrawn
BS EN 50191:2001	Erection and operation of electrical test equipment Categories: Testing. Electrical and electronic \| Electrical engineering. General Withdrawn begins : 2010-11-16	Withdrawn

Message Committee Become a committee member

Committee members

Nominating organizations

B E A M A Installation Ltd
B E A M A Networks
British Cables Association
Chartered Institution of Building Services Engineers
Committee Manager
E E M U A - The Engineering Equipment & Materials Users' Association
E N A - Energy Networks Association
EA Technology Ltd
H S E - Health and Safety Executive
SSEN Transmission
The Association of Manufacturers of Power generating Systems

Liaisons with other committees

Individual Capacity - HV power system protection design
Individual Capacity - HV Substation Design
Individual Capacity - Power Earthing
Individual Capacity – Power Distribution Applications seat
Liaison - GEL/28
Liaison - GEL/600
Liaison - GEL/8/4
Liaison - PEL/78

BSI roles

Committee Chair

Standards Development

PEL/99 - Erection and operation of power installations

Committee standards activity