Definitions Flashcards
A notice defining access to and egress from a demarcated area
Access Point Notice
When ‘shall’ is used in these Rules with no qualification, this indicates a mandatory requirement. No discretion is permitted and no judgement can be made.
Shall
Structure
A tower, gantry or other means of supporting or giving access to exposed HV conductors.
Danger
A risk to health, or bodily injury.
Safe Operating Limit
The design operating limits (incorporating a suitable margin of safety) beyond which failure is liable to occur
A Safety Document of a design shown in these Rules specifying the Equipment, the work to be carried out and the actions taken to achieve Safety from the System
Permit for Work
Danger Notice
A notice which is attached to Equipment and structures to warn of electrical or mechanical Danger(s)
Incorporates: a) System comprising one or more pressure vessels of rigid construction, any associated pipe work and protective devices b) Pipe work with its protective devices to which a transportable pressure receptacle is, or is intended to be connected, or c) A pipeline and its protective devices which contains or is liable to contain a relevant fluid, but does not include a transportable gas container Examples include air dryers, air receivers, air operated circuit breakers and associated equipment, nitrogen accumulators on hydraulically operated circuit breakers, SF6 gas handling equipment. Note: This is not an exhaustive list.
Pressure System
An enclosure, chamber, cubicle or cell designed to prevent uncontrolled access to Equipment having exposed HV conductors. This term does not apply to metalclad switchgear spouts.
Compartment
An identified area where access is restricted from Equipment, which may have a defect and may have the potential to cause harm
Risk Management Hazard Zone
High Voltage (HV)
A Voltage exceeding 1000 volts.
A risk to health, or bodily injury.
Danger
Automatically Controlled
Operation of Equipment by control systems such as protection, pressure devices and voltage control
A level of supervision whereby the nominated Personnel is available at the Location where the work is being carried out and able to attend the point of work as necessary.
Local Supervision
Keep Clear Overhead Live Equipment Notice
A notice warning about Danger from overhead Live Equipment
Connected to earth by means of an Earthing Device.
Earthed
That condition which safeguards persons working on or near to Equipment from the Dangers which are inherent in a System.
Safety from the System
Physical Separation
A gap of sufficient distance to allow HV Equipment to be tested and exclude Danger to persons who would otherwise be affected by the test supplies whilst working on other HV Equipment within the same Isolated zone.
Earthing Schedule
A schedule indicating the Drain Earth requirements for each stage of work
A device for rendering Equipment Isolated
Isolating Device
A tower, gantry or other means of supporting or giving access to exposed HV conductors.
Structure
Disconnected from associated Equipment by the operation of an Isolating Device to the isolating position or by adequate physical separation which shall ensure the isolation gap cannot fail electrically.
Isolated
Charged
At a voltage when Isolated from the System by induction or a retained charge due to capacitive effects
A key unique at the Location for operating a lock, other than the control lock, on a Key Safe.
Key Safe Key
A Safety Document of a design shown in these Rules specifying the Equipment, the work to be carried out and the limits of the work and/or work area necessary to achieve Safety from the System
Limited Access Certificate
When ‘shall, where practicable’ is used to qualify a requirement, a slightly less strict standard is imposed. It means that where it is possible to achieve, in the light of current knowledge and invention, then the requirement shall be met. To avoid the requirement on the grounds of difficulty, inconvenience or cost is not allowed.
Shall, where practicable
Control Person (Operation)
An individual who has been appointed by an appropriate officer of the Company, or other Companies, to be responsible for the operational control and co-ordination of the System within and across defined boundaries. They can also transfer temporary control of a part of the HV System using a System State Certificate.
Person
An individual with sufficient technical knowledge or experience to avoid Danger.
Equipment
Electrical and mechanical operational assets to which the Safety Rules apply.
Dead
Not electrically Live or Charged.
Shall, where reasonably practicable
When ‘shall, where reasonably practicable’ is used to qualify a requirement, then a judgement shall be made as to what is reasonable. This shall take into account an assessment of the magnitude of the risk on the one hand and the cost, time and trouble, and effort necessary for averting the risk on the other hand.
Protective Devices
Devices designed to protect the Pressure System against excess pressure failure and devices designed to give warning that failure might occur, and includes bursting discs
Operation of Equipment by control systems such as protection, pressure devices and voltage control
Automatically Controlled
At a voltage by being connected to a source of electricity.
Live
A means of providing a connection between an electrical conductor and earth, being one of the following:- a) Primary Earth: A type registered fixed or portable Earthing Device applied to an electrical conductor to protect against inadvertent energisation. b) Drain Earth: A type registered fixed or portable Earthing Device applied to electrical Equipment for the purpose of protection against Charged Equipment and management of circulating currents.
Earthing Device
Competent Person
A Person who has been appointed by an appropriate officer of the Company to carry out duties specified in writing including the receipt, transfer and clearance of Safety Documents.
Key Safe Key
A key unique at the Location for operating a lock, other than the control lock, on a Key Safe.
Access Point Notice
A notice defining access to and egress from a demarcated area
Height Barrier
A barrier or boom suitably constructed with a sign denoting the safe height to control over height vehicular access.
Personal Supervision
A level of supervision whereby the nominated Personnel is continuously observing and in the presence of the individual(s) with the ability to directly intervene. When individual(s) are working at height supervision can be given at ground level providing verbal and visual communication is maintained at all times. This level of supervision shall ensure individual(s) are not exposed to Danger.
A notice conveying a warning against interference which shall be attached at all Points of Isolation.
Caution Notice
Control Key
A key for operating the control lock of a Key Safe
The distance from the nearest High Voltage exposed conductor, or from an insulator supporting a High Voltage conductor, which shall be maintained to avoid Danger.
Safety Distance
The point at which Equipment has been Isolated and where practicable, or in the case of LV Equipment where reasonably practicable, the isolation point immobilised and Locked. Caution Notices shall be attached at all Points of Isolation.
Point(s) of Isolation
A notice warning about Danger from overhead Live Equipment
Keep Clear Overhead Live Equipment Notice
Connections for bonding items of field or access equipment to earth in order to manage Impressed Voltage conditions. The earths are coloured orange to identify them from Drain Earth(s) and are not included on an Earthing Schedule. They shall have a minimum cross sectional area of 25mm2 copper equivalent.
Field Equipment Earth
Authorised Person
A Person who has been appointed by an appropriate officer of the Company to carry out operational and safety switching duties as specified in writing.
Safety Key
A key unique at the Location for locking an Isolation Device, Earthing Device, vent or drain device / valve.
A notice prohibiting access
Access Prohibition Notice
A certificate which defines the boundaries of that part of a System for which the control is to be transferred between a Control Person (Operation)1 and a Control Person (Safety)1.
System State Certificate
System Failure
The unintentional release of stored energy (other than from a pressure relief system, acting within its’ performance criteria) from a Pressure System
Working Party
Individuals working under the Personal Supervision of a Competent Person or Persons working under the Local Supervision of a Competent Person, including a Competent Person or Person working alone.
Operational Switching
Operation of Equipment under the instructions of a Control Person (Operation) to ensure safe operation of the System.
Shall
When ‘shall’ is used in these Rules with no qualification, this indicates a mandatory requirement. No discretion is permitted and no judgement can be made.
Any place at which work under the Company Safety Rules are carried out.
Location
A notice identifying all required access points to the gas zone which require venting prior to access in accordance with Management Procedure - NSI 10 “Equipment Containing Sulphur Hexafluoride (SF6)”
Designated Gas Zone Access Point Notice
Approved
Sanctioned for use by the Head of UK Safety and Maintenance Delivery Electricity Manager.
Items of equipment, which if not controlled during handling could infringe Safety Distance, such as ladders, scaffold poles, ropes, reinforcing bar, plywood sheets etc.
Object(s)
Access Prohibition Notice
A notice prohibiting access
Isolating Device
A device for rendering Equipment Isolated
A notice which is attached to Equipment and structures to warn of electrical or mechanical Danger(s)
Danger Notice
Vented
Having an outlet to the atmosphere so that pressure is equalised to atmospheric pressure.
A condition of Equipment that cannot be altered without the operation of a secure fastening device.
Locked
A key unique at the Location for locking an Isolation Device, Earthing Device, vent or drain device / valve.
Safety Key
Examination of the Pressure System as specified in the Scheme of Examination
Examination
The design operating limits (incorporating a suitable margin of safety) beyond which failure is liable to occur
Safe Operating Limit
Operator
An individual who has been trained and assessed to use specific types of mobile elevated work platforms, lorry loaders, vehicles, or cranes.
Safety Switching
Operation of Equipment under the instructions of a Control Person (Safety) to achieve Safety from the System.
Shall, where practicable
When ‘shall, where practicable’ is used to qualify a requirement, a slightly less strict standard is imposed. It means that where it is possible to achieve, in the light of current knowledge and invention, then the requirement shall be met. To avoid the requirement on the grounds of difficulty, inconvenience or cost is not allowed.
Local Supervision
A level of supervision whereby the nominated Personnel is available at the Location where the work is being carried out and able to attend the point of work as necessary.
Key Safe
A lockable device for the secure retention of Keys, links and fuses.
When ‘shall, where reasonably practicable’ is used to qualify a requirement, then a judgement shall be made as to what is reasonable. This shall take into account an assessment of the magnitude of the risk on the one hand and the cost, time and trouble, and effort necessary for averting the risk on the other hand.
Shall, where reasonably practicable
Caution Notice
A notice conveying a warning against interference which shall be attached at all Points of Isolation.
Scheme of Examination
A documented written scheme produced by a competent person, as defined by the Pressure System Safety Regulations, specifying the nature and frequency of examination. It shall cover all protective devices, every pressure vessel and those parts of pipelines and pipe work which, if failure occurs may give rise to Danger
A documented written scheme produced by a competent person, as defined by the Pressure System Safety Regulations, specifying the nature and frequency of examination. It shall cover all protective devices, every pressure vessel and those parts of pipelines and pipe work which, if failure occurs may give rise to Danger
Scheme of Examination
A lockable device for the secure retention of Keys, links and fuses.
Key Safe
Certificate for Live LV Work
A Safety Document of a design shown in these Rules specifying the LV Equipment, the work which is to be carried out Live and the precautions to be taken to achieve a safe system of work.
A secured area that contains HV Equipment. This excludes areas that only contain over sailing conductors.
HV Compound
Having an outlet to the atmosphere so that pressure is equalised to atmospheric pressure.
Vented
Safety Distance
The distance from the nearest High Voltage exposed conductor, or from an insulator supporting a High Voltage conductor, which shall be maintained to avoid Danger.
System
Items of Equipment which are used separately or in combination for the generation, transmission or distribution of electricity.
A lockable device for the secure retention of Safety Document(s) and the associated Key Safe Key(s).
Card Safe
At a voltage when Isolated from the System by induction or a retained charge due to capacitive effects
Charged
Compartment
An enclosure, chamber, cubicle or cell designed to prevent uncontrolled access to Equipment having exposed HV conductors. This term does not apply to metalclad switchgear spouts.
Object(s)
Items of equipment, which if not controlled during handling could infringe Safety Distance, such as ladders, scaffold poles, ropes, reinforcing bar, plywood sheets etc.
Operation of Equipment under the instructions of a Control Person (Safety) to achieve Safety from the System.
Safety Switching
Company, The
National Grid UK Electricity Transmission plc.
Earthing Device
A means of providing a connection between an electrical conductor and earth, being one of the following:- a) Primary Earth: A type registered fixed or portable Earthing Device applied to an electrical conductor to protect against inadvertent energisation. b) Drain Earth: A type registered fixed or portable Earthing Device applied to electrical Equipment for the purpose of protection against Charged Equipment and management of circulating currents.
Card Safe
A lockable device for the secure retention of Safety Document(s) and the associated Key Safe Key(s).
Limited Access Certificate
A Safety Document of a design shown in these Rules specifying the Equipment, the work to be carried out and the limits of the work and/or work area necessary to achieve Safety from the System
A Person who has been appointed by an appropriate officer of the Company to carry out operational and safety switching duties as specified in writing.
Authorised Person
Sanctioned for use by the Head of UK Safety and Maintenance Delivery Electricity Manager.
Approved
Operation of Equipment under the instructions of a Control Person (Operation) to ensure safe operation of the System.
Operational Switching
Operation of Equipment from points remote from the Equipment itself such as on site from the Substation Control Point or Remote Control Point
Remotely Controlled
Fixed Height
Whereby the height of the relevant vehicle cannot be changed.
Location
Any place at which work under the Company Safety Rules are carried out.
Live
At a voltage by being connected to a source of electricity.
Control Person (Safety)
An individual who has been appointed by an appropriate officer of the Company, or other Companies, to be responsible for controlling and co-ordinating safety activities necessary to achieve Safety from the System within and across defined boundaries. They can also receive temporary control of a part of the HV System using a System State Certificate.
Appointed Person
An individual trained to establish and implement the safe system of work for the lifting operation in accordance with the requirements of BS 7121, Safe use of Cranes.
An individual with sufficient technical knowledge or experience to avoid Danger.
Person
A voltage up to and including 1000 volts.
Low Voltage (LV)
A notice reading “LAC” in the form of blue sleeves
Limited Access Certificate Notice
Vented Gas Zone Access Point Notice
A notice identifying all required access points to the gas zone which have been vented and can now be entered in accordance with Management Procedure - NSI 10 “Equipment Containing Sulphur Hexafluoride (SF6)”
A Competent Person appointed by an appropriate officer of the Company to carry out duties specified in writing, including the preparation, issue, transfer and cancellation of specified Safety Documents.
Senior Authorised Person
An individual who has been appointed by an appropriate officer of the Company, or other Companies, to be responsible for the operational control and co-ordination of the System within and across defined boundaries. They can also transfer temporary control of a part of the HV System using a System State Certificate.
Control Person (Operation)
A gap of sufficient distance to allow HV Equipment to be tested and exclude Danger to persons who would otherwise be affected by the test supplies whilst working on other HV Equipment within the same Isolated zone.
Physical Separation
A Person selected by the recipient of the Safety Document, or the Senior Authorised Person, to assist in ensuring the safe movement, or use, of mobile elevated work platforms, lorry loaders, vehicles, cranes and Objects within the demarcated work area.
Safety Observer
A barrier or boom suitably constructed with a sign denoting the safe height to control over height vehicular access.
Height Barrier
Testing Area No Entry Notice
A notice prohibiting entry to the testing area unless under the Personal Supervision of the holder of the Safety Document
Risk Management Hazard Zone Notice
A notice that is attached to a yellow and black chain demarcating a Risk Management Hazard Zone
A notice prohibiting entry to the testing area unless under the Personal Supervision of the holder of the Safety Document
Testing Area No Entry Notice
Individuals working under the Personal Supervision of a Competent Person or Persons working under the Local Supervision of a Competent Person, including a Competent Person or Person working alone.
Working Party
Colours or symbols used to identify overhead line circuits and other Equipment.
Circuit Identification
Under operational control of a Control Person (Operation).
Operational Service
Safety Observer
A Person selected by the recipient of the Safety Document, or the Senior Authorised Person, to assist in ensuring the safe movement, or use, of mobile elevated work platforms, lorry loaders, vehicles, cranes and Objects within the demarcated work area.
Earthed
Connected to earth by means of an Earthing Device.
System State Certificate
A certificate which defines the boundaries of that part of a System for which the control is to be transferred between a Control Person (Operation)1 and a Control Person (Safety)1.
Consent
Confirmation by the Control Person (Safety), before the issue of a Safety Document, that safety precautions have been carried out on the correct Equipment and that procedures have been put in place to maintain these until the Safety Document is cancelled.
Isolated
Disconnected from associated Equipment by the operation of an Isolating Device to the isolating position or by adequate physical separation which shall ensure the isolation gap cannot fail electrically.
The unintentional release of stored energy (other than from a pressure relief system, acting within its’ performance criteria) from a Pressure System
System Failure
A level of supervision whereby the nominated Personnel is continuously observing and in the presence of the individual(s) with the ability to directly intervene. When individual(s) are working at height supervision can be given at ground level providing verbal and visual communication is maintained at all times. This level of supervision shall ensure individual(s) are not exposed to Danger.
Personal Supervision
A notice reading “Test Area” in the form of red sleeves
Testing Notice
Sanction for Work
A Safety Document of a design shown in these Rules specifying the HV Equipment, the work to be carried out which requires the removal of Primary Earths and the actions taken to achieve Safety from the System.
A Safety Document of a design shown in these Rules specifying the HV Equipment, the work to be carried out which requires the removal of Primary Earths and the actions taken to achieve Safety from the System.
Sanction for Work
Circuit Identification
Colours or symbols used to identify overhead line circuits and other Equipment.
A Person who has been appointed by an appropriate officer of the Company to carry out duties specified in writing including the receipt, transfer and clearance of Safety Documents.
Competent Person
Electrical and mechanical operational assets to which the Safety Rules apply.
Equipment
General Safety
- The provision and maintenance of safe access to and from the place of work, 2. a safe place of work, 3. a safe working environment, 4. safe systems of work and 5. the correct use of personal protective equipment.
Remotely Controlled
Operation of Equipment from points remote from the Equipment itself such as on site from the Substation Control Point or Remote Control Point
Field Equipment Earth
Connections for bonding items of field or access equipment to earth in order to manage Impressed Voltage conditions. The earths are coloured orange to identify them from Drain Earth(s) and are not included on an Earthing Schedule. They shall have a minimum cross sectional area of 25mm2 copper equivalent.
Limited Access Certificate Notice
A notice reading “LAC” in the form of blue sleeves
Examination
Examination of the Pressure System as specified in the Scheme of Examination
Safety from the System
That condition which safeguards persons working on or near to Equipment from the Dangers which are inherent in a System.
A Voltage exceeding 1000 volts.
High Voltage (HV)
Designated Gas Zone Access Point Notice
A notice identifying all required access points to the gas zone which require venting prior to access in accordance with Management Procedure - NSI 10 “Equipment Containing Sulphur Hexafluoride (SF6)”
National Grid UK Electricity Transmission plc.
Company, The
Senior Authorised Person
A Competent Person appointed by an appropriate officer of the Company to carry out duties specified in writing, including the preparation, issue, transfer and cancellation of specified Safety Documents.
Low Voltage (LV)
A voltage up to and including 1000 volts.
Confirmation by the Control Person (Safety), before the issue of a Safety Document, that safety precautions have been carried out on the correct Equipment and that procedures have been put in place to maintain these until the Safety Document is cancelled.
Consent
Whereby the height of the relevant vehicle cannot be changed.
Fixed Height
An individual trained to establish and implement the safe system of work for the lifting operation in accordance with the requirements of BS 7121, Safe use of Cranes.
Appointed Person
Items of Equipment which are used separately or in combination for the generation, transmission or distribution of electricity.
System
Devices designed to protect the Pressure System against excess pressure failure and devices designed to give warning that failure might occur, and includes bursting discs
Protective Devices
- The provision and maintenance of safe access to and from the place of work, 2. a safe place of work, 3. a safe working environment, 4. safe systems of work and 5. the correct use of personal protective equipment.
General Safety
A schedule indicating the Drain Earth requirements for each stage of work
Earthing Schedule
Permit for Work
A Safety Document of a design shown in these Rules specifying the Equipment, the work to be carried out and the actions taken to achieve Safety from the System
An individual who has been appointed by an appropriate officer of the Company, or other Companies, to be responsible for controlling and co-ordinating safety activities necessary to achieve Safety from the System within and across defined boundaries. They can also receive temporary control of a part of the HV System using a System State Certificate.
Control Person (Safety)
Locked
A condition of Equipment that cannot be altered without the operation of a secure fastening device.
Risk Management Hazard Zone
An identified area where access is restricted from Equipment, which may have a defect and may have the potential to cause harm
A notice identifying all required access points to the gas zone which have been vented and can now be entered in accordance with Management Procedure - NSI 10 “Equipment Containing Sulphur Hexafluoride (SF6)”
Vented Gas Zone Access Point Notice
A condition of Equipment from which any dangerous contents have been removed.
Purged
An individual who has been trained and assessed to use specific types of mobile elevated work platforms, lorry loaders, vehicles, or cranes.
Operator
A key for operating the control lock of a Key Safe
Control Key
Testing Notice
A notice reading “Test Area” in the form of red sleeves
Not electrically Live or Charged.
Dead
Point(s) of Isolation
The point at which Equipment has been Isolated and where practicable, or in the case of LV Equipment where reasonably practicable, the isolation point immobilised and Locked. Caution Notices shall be attached at all Points of Isolation.
Pressure System
Incorporates: a) System comprising one or more pressure vessels of rigid construction, any associated pipe work and protective devices b) Pipe work with its protective devices to which a transportable pressure receptacle is, or is intended to be connected, or c) A pipeline and its protective devices which contains or is liable to contain a relevant fluid, but does not include a transportable gas container Examples include air dryers, air receivers, air operated circuit breakers and associated equipment, nitrogen accumulators on hydraulically operated circuit breakers, SF6 gas handling equipment. Note: This is not an exhaustive list.
A Safety Document of a design shown in these Rules specifying the LV Equipment, the work which is to be carried out Live and the precautions to be taken to achieve a safe system of work.
Certificate for Live LV Work
Operational Service
Under operational control of a Control Person (Operation).
HV Compound
A secured area that contains HV Equipment. This excludes areas that only contain over sailing conductors.
A notice that is attached to a yellow and black chain demarcating a Risk Management Hazard Zone
Risk Management Hazard Zone Notice
Purged
A condition of Equipment from which any dangerous contents have been removed.
Conductor
A metallic or similar item that conducts electrical energy
On or Near
Exposed Live LV Equipment that can be touched either directly or indirectly during the course of work
Dangerous Energy Level
An energy level contained within batteries that are part of the System or of Low Voltage systems in which currents are not inherently limited
Dangerous Potential
A potential over 100V AC RMS or 55V DC
Impressed Conditions
Conditions which could cause dangerous induced voltages or currents, differences in earth potential or voltage differences in earth potential or voltages across any break in the conductive path
Safe Custody
A Key Safe or secure place that has been locked and the key(s) locked in a Key Safe
Plant
Electrical and/or Mechanical items, which are not part of the System and Disconnected from the System.
