A specialist who installs, repairs, inspects or maintains electrical installations.

The general term for phenomena and energy associated with electric charge and current.

Electrical potential difference, measured in volts.

The movement of electric charge through a conductor or circuit.

The value of current in a circuit, measured in amperes.

The rate at which electrical energy is transferred or converted.

Power converted into useful work or heat, normally measured in watts.

Power exchanged with reactive components, normally measured in vars.

The product of RMS voltage and current, normally measured in volt-amperes.

Opposition to electric current, measured in ohms.

The number of alternating-current cycles per second, measured in hertz.

Current that periodically changes direction and magnitude.

Current that flows with constant polarity.

An AC supply using one line conductor and normally a neutral conductor.

An AC system with three phase conductors displaced in phase.

A worker specialising in the installation of cables, containment, equipment and electrical systems.

A Russian occupational title commonly associated with operation, maintenance and repair of electrical equipment.

An engineer responsible for electrical technical decisions, calculations, coordination or documentation.

A formally appointed person responsible for organising the safe technical operation of a consumer electrical installation.

A coordinated set of technical decisions, drawings, calculations and specifications for a project.

Detailed drawings and documents used to carry out installation work.

A written description of the task, requirements, boundaries and expected result.

A simplified diagram showing distribution, circuits and protective devices using one line per circuit.

A functional diagram showing electrical relationships between components.

A diagram showing how equipment and terminals are physically interconnected.

Documents updated to reflect the installation as actually completed.

A register listing cable identifiers, origins, destinations, types, sizes and routes.

A document listing equipment, materials, quantities and technical references.

A record confirming work that will become inaccessible after construction is closed up.

A formal record of measurements, test methods, instruments and results.

A conductor or small cable used to carry electric current.

One or more insulated conductors with a protective covering and, where applicable, screen or armour.

An individual current-carrying element within a wire or cable.

A live conductor carrying supply voltage; often called a phase conductor in three-phase systems.

A conductor connected to the neutral point and able to carry operating current.

A conductor used for protection against electric shock.

A conductor combining protective and neutral functions in a defined part of a system.

A protective conductor connecting the installation to an earth electrode or earthing arrangement.

A conductor used to connect conductive parts for protective equipotential bonding.

A conductor made of copper.

A conductor made of aluminium or an aluminium alloy.

A cable containing one insulated conductor.

A cable containing two or more insulated cores.

A conductor made of fine strands to allow repeated bending or easier installation.

The nominal cross-sectional area of a conductor, normally stated in square millimetres.

Material that electrically separates conductive parts.

The outer protective covering of a cable.

A conductive layer used for electromagnetic screening or field control.

A metallic protective layer providing mechanical protection and sometimes an earthing path.

A Russian-designation fixed power cable with reduced flame propagation and low smoke emission.

A sheathed installation cable designation commonly used for fixed building wiring.

A Russian flexible insulated conductor used inside panels, equipment or protected wiring systems.

A Russian flexible multicore cord commonly used for appliances and portable connections.

A Russian flat flexible cord used for certain light-duty appliance connections.

A cable designed to maintain circuit integrity for a specified time under defined fire conditions.

The system of cables, conductors, accessories and containment forming an electrical installation.

Wiring installed within walls, floors, ceilings or building voids.

Wiring installed visibly on building surfaces or in surface containment.

The defined path followed by a cable or group of cables.

A support system used to carry cables.

An enclosed or partly enclosed wiring containment system with a removable cover.

Flexible corrugated tubing used for cable containment and mechanical protection.

Rigid tubing used to contain and protect conductors or cables.

An enclosure containing cable joints, terminals or circuit branches.

A box installed in a wall to support a socket-outlet, switch or accessory.

A fixed accessory intended to receive a plug.

A switch used to control a lighting circuit.

A switch used with another switch to control one load from two locations.

A control device used to adjust light output.

A complete lighting unit including the light source interface, optics, housing and connection components.

A terminal assembly used to divide one incoming conductor into several outgoing conductors.

An insulated assembly of terminals used to connect conductors.

A fitting that secures and seals a cable where it enters an enclosure.

A crimped ferrule used on a flexible stranded conductor before insertion into a suitable terminal.

An assembly used to join, branch or terminate cables, depending on type.

An enclosure containing electrical distribution, control and protective equipment.

A distribution board serving the circuits of one apartment.

A distribution board serving apartments or common circuits on a building floor.

An assembly receiving an incoming supply and distributing it to building or facility circuits.

The principal low-voltage distribution board of a building or facility.

A standard metal rail used to mount modular electrical equipment.

A standard width unit used to describe modular devices or available board space.

A device providing automatic protection against overload and short circuit.

The circuit-breaker controlling or protecting the incoming supply to a panel or installation.

A residual current device without integrated overcurrent protection.

A residual current operated circuit-breaker with integrated overcurrent protection.

A device intended to limit transient overvoltages and divert surge current.

A protective device that opens a circuit by melting a replaceable or integral element.

The replaceable current-carrying element of a fuse.

A switching device capable of making, carrying and breaking load current and providing isolation where rated.

A manually operated isolating device; the exact capability depends on its rating and design.

An electrically controlled switching device for frequent operation of power circuits.

A relay that monitors supply voltage and can disconnect or signal when limits are exceeded.

A relay monitoring phase sequence, phase loss, asymmetry or voltage conditions.

A latching relay that changes state when it receives a control pulse.

Equipment that transfers a load between normal and standby power sources.

Coordination intended to disconnect only the protective device nearest to a fault.

The current assigned to equipment for specified operating conditions.

Current flowing through an unintended path, insulation or protective conductor.

The residual current value assigned to an RCD, commonly marked IΔn.

The prospective current a protective device can interrupt under specified conditions.

The instantaneous magnetic tripping range of an MCB or RCBO.

An unintended low-impedance connection producing a very high fault current.

An overcurrent in an otherwise healthy circuit caused by excessive connected load.

A sustained electrical discharge through ionised gas, capable of producing intense heat and light.

An instrument combining voltage, current, resistance and other measurement functions.

An instrument that measures current by clamping around a conductor.

A device used to indicate the presence or absence of voltage within its rated conditions.

A contact voltage tester using two probes to indicate voltage between two points.

An instrument applying a test voltage to measure insulation resistance.

An instrument used to measure earth electrode or earthing system resistance.

An instrument used to measure line-neutral or earth fault loop impedance, depending on test mode.

An instrument used to test residual current device operating current and time.

An instrument used to identify the phase rotation of a three-phase supply.

An instrument displaying voltage waveforms against time.

Measurement of potential difference between two points.

Measurement of electric current in a conductor or circuit.

Resistance of insulation measured under specified test conditions.

Resistance between an earth electrode system and the surrounding earth under test conditions.

Verification that the protective conductor path is electrically continuous.

The impedance path formed by the line and neutral conductors.

Verification that line, neutral and switching connections are correctly arranged.

Verification of the order of the three phases.

Comparison of an instrument with a reference to establish measurement characteristics.

A legally defined confirmation that a measuring instrument meets applicable metrological requirements.

Connection of parts of an electrical system to the general mass of earth for protective or functional purposes.

Earthing used as part of protection against electric shock.

Earthing provided for a functional purpose rather than solely for electrical safety.

A system in which protective and neutral functions are combined in a PEN conductor throughout the defined section.

A system with separate protective and neutral conductors throughout.

A system using a PEN conductor in one part and separate PE and N conductors after a defined separation point.

A system where exposed-conductive-parts are connected to a local earth electrode independent of the supply neutral earthing.

A system with the supply isolated from earth or connected through impedance, with exposed parts earthed.

Bonding of specified incoming services and conductive parts to reduce dangerous potential differences.

Additional bonding used in a defined location where required by the protective measures.

Disconnection of electrical energy from the relevant equipment or work area.

Confirmation with suitable equipment that the intended conductors are not live.

A formal document defining the work, location, safety measures, responsible persons and work boundaries.

Equipment worn or used to reduce exposure to workplace hazards.

A classification of enclosure protection against access, solid objects and water.

A broad Russian construction term for communications, security, data and control systems.

A standardised telecommunications cabling infrastructure for data, voice and related services.

A data network connecting devices within a limited area.

A device providing Wi-Fi access to a wired network.

A system of cameras, recording equipment, network links and monitoring interfaces.

A system for visitor calling, communication and controlled door release.

A system controlling and recording access through doors, gates or other controlled points.

A system for detecting and signalling fire-related events.

An integrated system for monitoring and controlling lighting, climate, security and other building functions.

An industrial controller programmed to automate machines or processes.

A specialist who installs, repairs, inspects or maintains electrical installations.

The general term for phenomena and energy associated with electric charge and current.

Electrical potential difference, measured in volts.

The movement of electric charge through a conductor or circuit.

The value of current in a circuit, measured in amperes.

The rate at which electrical energy is transferred or converted.

Power converted into useful work or heat, normally measured in watts.

Power exchanged with reactive components, normally measured in vars.

The product of RMS voltage and current, normally measured in volt-amperes.

Opposition to electric current, measured in ohms.

The number of alternating-current cycles per second, measured in hertz.

Current that periodically changes direction and magnitude.

Current that flows with constant polarity.

An AC supply using one line conductor and normally a neutral conductor.

An AC system with three phase conductors displaced in phase.

A worker specialising in the installation of cables, containment, equipment and electrical systems.

A Russian occupational title commonly associated with operation, maintenance and repair of electrical equipment.

An engineer responsible for electrical technical decisions, calculations, coordination or documentation.

A formally appointed person responsible for organising the safe technical operation of a consumer electrical installation.

A coordinated set of technical decisions, drawings, calculations and specifications for a project.

Detailed drawings and documents used to carry out installation work.

A written description of the task, requirements, boundaries and expected result.

A simplified diagram showing distribution, circuits and protective devices using one line per circuit.

A functional diagram showing electrical relationships between components.

A diagram showing how equipment and terminals are physically interconnected.

Documents updated to reflect the installation as actually completed.

A register listing cable identifiers, origins, destinations, types, sizes and routes.

A document listing equipment, materials, quantities and technical references.

A record confirming work that will become inaccessible after construction is closed up.

A formal record of measurements, test methods, instruments and results.

A conductor or small cable used to carry electric current.

One or more insulated conductors with a protective covering and, where applicable, screen or armour.

An individual current-carrying element within a wire or cable.

A live conductor carrying supply voltage; often called a phase conductor in three-phase systems.

A conductor connected to the neutral point and able to carry operating current.

A conductor used for protection against electric shock.

A conductor combining protective and neutral functions in a defined part of a system.

A protective conductor connecting the installation to an earth electrode or earthing arrangement.

A conductor used to connect conductive parts for protective equipotential bonding.

A conductor made of copper.

A conductor made of aluminium or an aluminium alloy.

A cable containing one insulated conductor.

A cable containing two or more insulated cores.

A conductor made of fine strands to allow repeated bending or easier installation.

The nominal cross-sectional area of a conductor, normally stated in square millimetres.

Material that electrically separates conductive parts.

The outer protective covering of a cable.

A conductive layer used for electromagnetic screening or field control.

A metallic protective layer providing mechanical protection and sometimes an earthing path.

A Russian-designation fixed power cable with reduced flame propagation and low smoke emission.

A sheathed installation cable designation commonly used for fixed building wiring.

A Russian flexible insulated conductor used inside panels, equipment or protected wiring systems.

A Russian flexible multicore cord commonly used for appliances and portable connections.

A Russian flat flexible cord used for certain light-duty appliance connections.

A cable designed to maintain circuit integrity for a specified time under defined fire conditions.

The system of cables, conductors, accessories and containment forming an electrical installation.

Wiring installed within walls, floors, ceilings or building voids.

Wiring installed visibly on building surfaces or in surface containment.

The defined path followed by a cable or group of cables.

A support system used to carry cables.

An enclosed or partly enclosed wiring containment system with a removable cover.

Flexible corrugated tubing used for cable containment and mechanical protection.

Rigid tubing used to contain and protect conductors or cables.

An enclosure containing cable joints, terminals or circuit branches.

A box installed in a wall to support a socket-outlet, switch or accessory.

A fixed accessory intended to receive a plug.

A switch used to control a lighting circuit.

A switch used with another switch to control one load from two locations.

A control device used to adjust light output.

A complete lighting unit including the light source interface, optics, housing and connection components.

A terminal assembly used to divide one incoming conductor into several outgoing conductors.

An insulated assembly of terminals used to connect conductors.

A fitting that secures and seals a cable where it enters an enclosure.

A crimped ferrule used on a flexible stranded conductor before insertion into a suitable terminal.

An assembly used to join, branch or terminate cables, depending on type.

An enclosure containing electrical distribution, control and protective equipment.

A distribution board serving the circuits of one apartment.

A distribution board serving apartments or common circuits on a building floor.

An assembly receiving an incoming supply and distributing it to building or facility circuits.

The principal low-voltage distribution board of a building or facility.

A standard metal rail used to mount modular electrical equipment.

A standard width unit used to describe modular devices or available board space.

A device providing automatic protection against overload and short circuit.

The circuit-breaker controlling or protecting the incoming supply to a panel or installation.

A residual current device without integrated overcurrent protection.

A residual current operated circuit-breaker with integrated overcurrent protection.

A device intended to limit transient overvoltages and divert surge current.

A protective device that opens a circuit by melting a replaceable or integral element.

The replaceable current-carrying element of a fuse.

A switching device capable of making, carrying and breaking load current and providing isolation where rated.

A manually operated isolating device; the exact capability depends on its rating and design.

An electrically controlled switching device for frequent operation of power circuits.

A relay that monitors supply voltage and can disconnect or signal when limits are exceeded.

A relay monitoring phase sequence, phase loss, asymmetry or voltage conditions.

A latching relay that changes state when it receives a control pulse.

Equipment that transfers a load between normal and standby power sources.

Coordination intended to disconnect only the protective device nearest to a fault.

The current assigned to equipment for specified operating conditions.

Current flowing through an unintended path, insulation or protective conductor.

The residual current value assigned to an RCD, commonly marked IΔn.

The prospective current a protective device can interrupt under specified conditions.

The instantaneous magnetic tripping range of an MCB or RCBO.

An unintended low-impedance connection producing a very high fault current.

An overcurrent in an otherwise healthy circuit caused by excessive connected load.

A sustained electrical discharge through ionised gas, capable of producing intense heat and light.

An instrument combining voltage, current, resistance and other measurement functions.

An instrument that measures current by clamping around a conductor.

A device used to indicate the presence or absence of voltage within its rated conditions.

A contact voltage tester using two probes to indicate voltage between two points.

An instrument applying a test voltage to measure insulation resistance.

An instrument used to measure earth electrode or earthing system resistance.

An instrument used to measure line-neutral or earth fault loop impedance, depending on test mode.

An instrument used to test residual current device operating current and time.

An instrument used to identify the phase rotation of a three-phase supply.

An instrument displaying voltage waveforms against time.

Measurement of potential difference between two points.

Measurement of electric current in a conductor or circuit.

Resistance of insulation measured under specified test conditions.

Resistance between an earth electrode system and the surrounding earth under test conditions.

Verification that the protective conductor path is electrically continuous.

The impedance path formed by the line and neutral conductors.

Verification that line, neutral and switching connections are correctly arranged.

Verification of the order of the three phases.

Comparison of an instrument with a reference to establish measurement characteristics.

A legally defined confirmation that a measuring instrument meets applicable metrological requirements.

Connection of parts of an electrical system to the general mass of earth for protective or functional purposes.

Earthing used as part of protection against electric shock.

Earthing provided for a functional purpose rather than solely for electrical safety.

A system in which protective and neutral functions are combined in a PEN conductor throughout the defined section.

A system with separate protective and neutral conductors throughout.

A system using a PEN conductor in one part and separate PE and N conductors after a defined separation point.

A system where exposed-conductive-parts are connected to a local earth electrode independent of the supply neutral earthing.

A system with the supply isolated from earth or connected through impedance, with exposed parts earthed.

Bonding of specified incoming services and conductive parts to reduce dangerous potential differences.

Additional bonding used in a defined location where required by the protective measures.

Disconnection of electrical energy from the relevant equipment or work area.

Confirmation with suitable equipment that the intended conductors are not live.

A formal document defining the work, location, safety measures, responsible persons and work boundaries.

Equipment worn or used to reduce exposure to workplace hazards.

A classification of enclosure protection against access, solid objects and water.

A broad Russian construction term for communications, security, data and control systems.

A standardised telecommunications cabling infrastructure for data, voice and related services.

A data network connecting devices within a limited area.

A device providing Wi-Fi access to a wired network.

A system of cameras, recording equipment, network links and monitoring interfaces.

A system for visitor calling, communication and controlled door release.

A system controlling and recording access through doors, gates or other controlled points.

A system for detecting and signalling fire-related events.

An integrated system for monitoring and controlling lighting, climate, security and other building functions.

An industrial controller programmed to automate machines or processes.