ToolsArmenia Knowledge Base Electrical Equipment Explained: Classification by Purpose, Voltage and Protection "Electrical equipment" covers everything from a circuit breaker and an extension lead to a voltage stabilizer, a fan or a machine tool. This article explains the main groups and the parameters used to compare them. Reading time: about 9 min Updated: October 2026 ToolsArmenia Editorial Team Contents What electrical equipment isClassification criteriaMain groupsCommon mistakesFinal checklistFAQ What electrical equipment isElectrical equipment is any device or system that generates, converts, distributes, protects or uses electrical energy. In practice it falls into two large groups: network components (cables, panels, breakers, sockets) and energy consumers (motors, heaters, floodlights, machine tools, pumps).For the right choice, what matters is not only the device type but also its compatibility with your supply: voltage, number of phases, current and degree of protection. More equipment selection guides are in Choosing Equipment and Machinery.RememberBefore choosing any electrical equipment, check the voltage and number of phases of your supply and the load the circuit is designed for. Classification criteriaPurposeBy purpose there are distribution and protection devices, cables and connection components, power quality devices (stabilizers, UPS, inverters), lighting, heating and ventilation, and motors and working machines.Voltage and phasesHousehold and small workshop devices are usually single-phase (220–230 V), while powerful machines, compressors and motors can be three-phase (380–400 V). A three-phase device cannot be connected directly to a single-phase supply.Power and currentPower (W or kW) and current draw (A) determine which cable, breaker and socket you need. The starting current of motor-driven devices can be several times the rated current.Degree of protection (IP)The IP code shows protection against dust and water. Devices used outdoors or in damp or dusty areas need a higher IP rating.Electrical safety classClass I devices require earthing, while Class II devices have double insulation. This determines which socket and protection are needed.Duty classThe same device type can be household, semi-professional or industrial, with different permitted duty and service life.WarningDo not connect a powerful device to a circuit whose cable and breaker are not rated for that current. Panel work and fixed connections must be done by a qualified electrician. Main groupsBelow are the main groups and what to check for each of them.GroupExamplesKey parametersWhat to checkDistribution and protectionBreakers, RCDs, panelsRated current, poles, breaking capacityMatch to the circuit and the loadCables and connectionsCables, extension leads, socketsCross-section, length, IPPower and outdoor usePower qualityStabilizers, UPS, invertersPower, input voltage rangeTotal power of connected devicesLightingFloodlights, work lightsLuminous flux, IPPlace of use and mountingMotors and machinesElectric motors, machine tools, pumpsPower, phases, speedSupply phases and starting current Common mistakesBuying a three-phase device when only a single-phase supply is available.Comparing devices by power alone and ignoring starting current.Using a device or lead with a low IP rating outdoors.Plugging several high-power devices into one extension lead.Ignoring earthing for Class I devices.Good practiceBefore buying, note your supply data (voltage, phases, breaker rating) and compare it with the device rating plate. Final checklistI know the supply voltage and number of phasesDevice power matches the circuit and breakerMotor starting current is taken into accountThe IP rating suits the place of useThere is an earthed socket for Class I devicesHousehold or industrial class is chosen by workload Frequently asked questionsWhat is the difference between single-phase and three-phase devices?Single-phase devices run on 220–230 V, three-phase devices on 380–400 V. Three-phase devices are usually more powerful and do not plug into a standard household socket.What do IP44 or IP65 mean?The first digit shows protection against solid particles and dust, the second against water. The higher the digit, the better the protection.Why does starting current matter?Motors draw several times their rated current at start-up, which can trip a breaker or overload a generator.When is a voltage stabilizer needed?When the supply voltage often goes outside the permitted range and the connected devices are sensitive to fluctuations.Who should install panel equipment?Panels, breakers and fixed connections must be installed by a qualified electrician in line with current regulations. Read alsohow to choose electrical protection and switching deviceshow to choose an electrical panel, distribution board and enclosurehow to choose sockets, plugs, extension leads and power stripshow to choose electrical cable, conduit, trunking and connectorshow to choose a transformer, power supply, voltage stabilizer, UPS and inverterhow to choose grounding and lightning protection equipment Related categoriesElectrical equipmentWelding devicesVacuum cleanersWater pumpsPressure washersVoltage stabilizersElectric space heaters and heat blowersCar battery chargers and starter-chargersElectric hoists and winchesFloodlights and work lightsExtension cords and cable reelsElectric concrete mixersBench grinders and sandersDrill pressesMitre sawsMetal cut-off and band sawsThicknessers and jointersTable sawsVertical band sawsWood lathesElectric motorsFansDehumidifiers Next article: how to choose electrical protection and switching devices
