Electrical Equipment, Appliances and Components Industry Terminology

AC Induction Motor

An electric motor where current induced in the rotor by the stator’s alternating magnetic field creates torque. Widely used in pumps, fans, compressors, and conveyors for robustness and cost-efficiency.

A conveyor is driven by a 3-phase AC induction motor with a VFD; Upgrade the line to IE3-efficiency AC induction motors to meet regulations; The pump spec calls for a 5 hp, 460 V, 60 Hz AC induction motor

Alternating Current (AC)

Electric current that periodically reverses direction, typically supplied by the grid at 50 or 60 Hz. Most household and industrial equipment interfaces to AC mains.

The appliance runs on 230 V AC mains; Use an AC-DC power supply to convert 120 V AC to 24 V DC; The test lab can provide 50 Hz and 60 Hz AC sources

APQP (Advanced Product Quality Planning)

A structured framework used to design and launch products with a focus on quality and cross-functional collaboration, commonly required by OEMs.

We’re in APQP Phase 2 and building the control plan; The customer requires APQP deliverables before SOP; APQP reviews caught a supplier tooling risk

Arc Flash

A dangerous, explosive release of energy caused by an electrical arc in high-energy systems. Mitigation involves proper design, labeling, PPE, and maintenance per standards like NFPA 70E.

Update arc-flash labels per NFPA 70E after the switchgear change; Conduct an arc-flash study to set appropriate PPE levels; The panel requires an arc-flash boundary of 1.2 cal/cm²

Battery Management System (BMS)

Electronics and software that monitor and protect rechargeable battery packs by managing state of charge, cell balancing, temperature, and safety limits.

The BMS balances cells and protects against overcharge; Integrate the BMS over CAN or Modbus for diagnostics; Firmware updates improved BMS state-of-charge accuracy

Bill of Materials (BOM)

A hierarchical list of all components, quantities, and assemblies required to build a product. Managed across engineering and manufacturing versions.

Engineering issued an ECO that changes the BOM revision; We need a cost roll-up for the top-level BOM; Use an MBOM for manufacturing and an EBOM for design

Brushless DC Motor (BLDC)

A high-efficiency motor using electronic commutation rather than brushes. Offers high power density, precise control, and low maintenance.

The BLDC fan reduces noise and improves efficiency; We’re using sensorless BLDC control for the compressor; BLDC motors simplify maintenance by eliminating brushes

Capacitor

A passive component that stores energy in an electric field. Used for filtering, power-factor correction, timing, and energy storage; special safety-rated types are required across mains.

Add an EMI filter with X and Y safety capacitors; The DC link capacitor must handle ripple current; We specified polymer capacitors for longer life

CE Marking

An EU conformity mark indicating the product meets applicable safety, health, and environmental directives and harmonized standards.

The inverter ships with a CE Declaration of Conformity; We tested per EN standards to support CE marking; The CE technical file must include risk assessments

Circuit Breaker (MCB/MCCB)

Automatically operated switch that interrupts overcurrent faults. MCBs protect branch circuits; MCCBs handle higher currents and are widely used in switchgear.

Select a Type C MCB to handle motor inrush; The MCCB in the main panel is rated 400 A; Coordination study ensures the breaker trips before the feeder fuse

Clearance and Creepage

Minimum distances in air (clearance) and along a surface (creepage) between conductive parts to prevent arcing and tracking. Defined by safety standards and environmental conditions.

Increase creepage on the PCB to meet IEC 62368-1; Pollution degree and overvoltage category affect required distances; Conformal coating can reduce required creepage

Design for Manufacturability (DFM)

Engineering practices that make products easier, faster, and cheaper to manufacture without sacrificing quality or reliability.

DFM feedback reduced assembly time by 20 percent; Update the design to meet automated test DFM rules; Early supplier DFM input avoided a tooling change

Dielectric Strength

The maximum electric field a material can withstand without electrical breakdown. Used to specify insulation and verify safety with hipot tests.

The insulation must withstand 3 kV for 60 s; We verified dielectric strength via AC hipot testing; Material selection improved dielectric breakdown margins

Electromagnetic Compatibility (EMC)

The ability of equipment to operate properly in its electromagnetic environment without causing interference to other devices. Includes emissions and immunity compliance.

Pre-scan EMC tests flagged radiated emissions at 200 MHz; Add shielding to improve EMC immunity; We designed the filter to meet EN 61000 limits

Electromagnetic Interference (EMI)

Unwanted electromagnetic energy that disrupts device operation or violates emission limits. Managed via filtering, shielding, grounding, and layout.

Use a common-mode choke to reduce conducted EMI; Switching edges were slowed to mitigate EMI; The EMI filter meets Class B limits

Energy Star

A U.S. program labeling energy-efficient products. Products meeting specified performance criteria can carry the Energy Star mark.

Our refrigerator meets Energy Star Most Efficient criteria; The label enables utility rebate eligibility; Redesign improved energy consumption to keep Energy Star

Failure Mode and Effects Analysis (FMEA)

A systematic method to identify potential failure modes, assess their effects and causes, and prioritize risk reduction actions in design (DFMEA) and process (PFMEA).

We ran a PFMEA on the assembly line to reduce scrap; High-RPN items got corrective actions; DFMEA identified thermal risks early

Gallium Nitride (GaN)

A wide-bandgap semiconductor material used in power devices, enabling higher efficiency, higher frequency, and smaller, lighter power supplies.

GaN switches boosted charger efficiency to 94 percent; Higher switching frequency with GaN shrank magnetics; Thermal design changed due to GaN’s fast transients

Grounding/Earthing

Connecting equipment to earth or a common reference to ensure safety and control noise. Critical for fault current return, EMI control, and ESD protection.

Bond the chassis to PE at a single point; Low-impedance grounding reduced ESD issues; Verify continuity of the protective earth conductor

HALT/HASS

Highly Accelerated Life Test (design) and Stress Screen (production) use step-stress environments to reveal design weaknesses and screen latent defects.

HALT exposed a cold-start issue at −40 C; HASS screens out early-life failures in production; Combine thermal and vibration profiles during HALT

Hi-Pot Test (Dielectric Withstand)

A high-voltage test to verify insulation integrity between isolated circuits or chassis and live parts, per safety standards.

Perform 2 kV AC hipot for 1 minute per UL; DC hipot reduces capacitive trip for large filters; Record leakage current during hipot testing

IEC Standards

International Electrotechnical Commission standards covering safety, performance, EMC, and more for electrical equipment and components.

Design the appliance to IEC 60335; Switchgear must comply with IEC 61439; EMC testing follows IEC/EN standards

Ingress Protection (IP) Rating

Two-digit code (e.g., IP54) defining protection against solids and liquids. Higher numbers indicate greater protection.

Specify IP65 for outdoor enclosures; IP6X means dust-tight, IPX7 means immersion; Compare NEMA 4X to roughly IP66 for water ingress

Inrush Current

A surge of current when power is first applied, often due to charging capacitors or magnetizing inductance. Managed by soft-start, NTCs, or staged turn-on.

Add an NTC thermistor to limit inrush; Soft-start circuitry prevents breaker nuisance trips; Transformer inrush requires slow-blow fuses

Insulation Class

Thermal rating (e.g., Class A, B, F, H) defining the allowable temperature of electrical insulation systems, especially in motors and transformers.

Use Class F insulation for motor windings; Temperature rise must keep within Class B limits; Re-rate based on ambient to protect insulation class

Inverter

Power electronics that convert DC to AC. Used in solar, motor drives, UPS, and many appliance controls.

The PV inverter converts DC to AC for the grid; A motor drive’s inverter stage uses IGBTs or MOSFETs; The UPS inverter supplies sine-wave AC

Lean Manufacturing

A set of principles and tools to eliminate waste and improve flow, quality, and responsiveness in manufacturing operations.

Implement 5S to stabilize the cell; Value stream mapping revealed bottlenecks; SMED cut changeover time and boosted OEE

Mean Time Between Failures (MTBF)

A statistical reliability metric estimating average operating time between failures for repairable items. Often derived from field data or predictions.

Datasheet quotes 500,000 hours MTBF per Telcordia; We used FIT data to model MTBF; Raise MTBF by lowering operating temperature

Modbus

An open industrial communication protocol used over serial (RTU) and Ethernet (TCP) for device monitoring and control.

Connect the PLC over Modbus RTU via RS-485; The inverter exposes telemetry via Modbus TCP; Map holding registers for power and alarms

NEC (National Electrical Code)

U.S. electrical installation code (NFPA 70) governing safe design and installation of electrical systems in buildings.

Follow NEC Article 250 for grounding and bonding; GFCI requirements apply in wet locations; Conductor sizing complies with NEC ampacity tables

NEMA Ratings

North American enclosure type ratings (e.g., NEMA 1, 4, 4X) defining environmental protection and corrosion resistance.

Use NEMA 4X for corrosive washdown areas; The enclosure is NEMA 12 for dust; Translate NEMA type to equivalent IP rating

OEE (Overall Equipment Effectiveness)

A composite metric of manufacturing productivity: Availability × Performance × Quality. Highlights losses and guides continuous improvement.

Our OEE is 74 percent due to changeover losses; TPM raised availability, improving OEE; Use OEE to prioritize bottleneck improvements

OEM/ODM/EMS (Manufacturing Business Models)

OEM markets the product; ODM designs and supplies a finished design; EMS (contract manufacturer) builds to a customer’s design.

We’ll use an ODM for the new smart thermostat; The OEM supplies the brand, the EMS builds the PCBAs; Dual-source the EMS to reduce supply risk

PCB (Printed Circuit Board)

A laminated substrate supporting and interconnecting electronic components. Key parameters include layer count, copper weight, spacing, impedance, and materials.

The power board uses a 4-layer PCB with heavy copper; Maintain creepage on the PCB for mains spacing; Controlled-impedance PCB traces for Ethernet

PLC (Programmable Logic Controller)

Industrial controller for deterministic machine control and sequencing, programmed using ladder, function block, or structured text.

Program the PLC with ladder logic; The PLC controls motors and reads sensors via Modbus; Add a safety PLC for SIL-rated functions

PLM (Product Lifecycle Management)

Systems and processes for managing product data, configurations, and changes across the full lifecycle from concept to end of life.

All changes flow through PLM via ECN; PLM maintains CAD, BOM, and firmware baselines; Use PLM to control variant configurations

Power Factor (PF)

The ratio of real power to apparent power in AC systems. Low PF increases current draw and losses; corrected using capacitors or active PFC circuits.

Add PFC to meet utility requirements; The motor runs at 0.85 PF under load; Active PFC raised PF to 0.99

QMS (ISO 9001 Quality Management System)

An organization’s documented system for managing quality to meet ISO 9001 requirements, including processes, audits, and continual improvement.

Passed the ISO 9001 surveillance audit; Use CAPA processes within the QMS; Procedures for calibration are part of the QMS

RCD (Residual Current Device)

A protective device that trips when it detects imbalance between live and neutral currents (leakage to earth), providing shock protection. Regional variants include GFCIs.

Install a 30 mA Type A RCD for personnel protection; Test the RCD trip time during commissioning; RCDs complement overcurrent breakers

REACH

EU regulation on Registration, Evaluation, Authorisation and Restriction of Chemicals. Requires control and disclosure of hazardous substances in products.

Provide REACH SVHC declarations to customers; Ensure compliance with Annex XVII restrictions; Update compliance when ECHA adds SVHCs

RoHS

Restriction of Hazardous Substances directives limit certain substances (e.g., lead, mercury) in electrical and electronic equipment placed on the market.

Confirm lead-free solder to meet RoHS; Document exemptions for high-temp solders; Supplier declarations support RoHS compliance

SOC (State of Charge)

A measure (percent) of remaining battery capacity relative to its nominal capacity. Estimated via voltage models, coulomb counting, or both.

SOC dropped to 20 percent under peak load; The BMS estimates SOC with coulomb counting; Display SOC on the user interface

SPD (Surge Protective Device)

A device that limits transient overvoltages (surges) by diverting surge energy, protecting equipment from lightning and switching events.

Install Type 2 SPDs at the distribution panel; MOV-based SPD protects against transients; Check SPD clamping voltage and let-through energy

Thermal Management

Techniques to control temperature of components and systems, including heat sinks, TIMs, heat pipes, airflow, and derating.

Add a heat sink and TIM to reduce junction temps; Use heat pipes to spread hot spots; Derate output based on ambient and airflow

TPM (Total Productive Maintenance)

A holistic maintenance approach engaging all employees to reduce equipment losses, increase availability, and improve quality.

Operators perform daily autonomous maintenance; TPM reduced unplanned downtime by 30 percent; TPM pillars support higher OEE

Transformer

An electromagnetic device that transfers power between circuits via magnetic coupling, providing voltage conversion and isolation.

Use an isolation transformer for safety and noise; The step-down transformer feeds the control circuits; Design for temperature rise within insulation class

UL 94 (Flammability)

A plastics flammability standard classifying materials (e.g., V-0, V-1, HB) by how they burn under test conditions.

Specify UL 94 V-0 plastics for enclosures; UL Yellow Card confirms the material’s UL 94 rating; HB is not sufficient near hot components

UL Certification/Listing

A safety compliance mark indicating the product or component has been evaluated to UL standards. Includes UL Listed for end products and UL Recognized for components.

The product is UL Listed and has a file number; Use UL Recognized components in the BOM; UL Follow-Up Services audit is scheduled

Variable Frequency Drive (VFD)

An AC motor controller that varies frequency and voltage to control speed and torque, improving efficiency and process control.

Install a VFD to control fan speed and save energy; The VFD’s PWM can create motor shaft voltage; Tune V/Hz or vector control for better torque

WEEE

EU Waste Electrical and Electronic Equipment directive requiring producer responsibility for collection, recycling, and proper disposal.

Set up a WEEE take-back program in the EU; Mark the product with the crossed-out wheeled bin; Producers must register and report WEEE volumes