Hire the best freelance Molding Design expert designers for your company

Hello! I am a mechanical engineering student looking to further my experience with engineering consulting. I am very experienced in AutoCAD, Inventor, and Solidworks. I have 2 years experience in plas... Read more

Hello! I am a mechanical engineering student looking to further my experience with engineering consulting. I am very experienced in AutoCAD, Inventor, and Solidworks. I have 2 years experience in plastic injection molding design, 4 years experience in 3D CAD software, and am certified in Inventor, AutoCAD, and Solidworks.

Mechanical Design Engineer (13 Years+ Ex.) |DESIGN Expertise in Product Design. Design and Development, Whatever You Think About Product I Will Create.| Imagination to Design Conversion. I have a Dyna... Read more

Mechanical Design Engineer (13 Years+ Ex.) |DESIGN Expertise in Product Design. Design and Development, Whatever You Think About Product I Will Create.| Imagination to Design Conversion. I have a Dynamic Profile with an Excellent Blend of Parts & Assembly CAD Design, Qualified BE Mechanical and Great Knowledge of the Design of Mechanical And CAD Modelling. For Designing I Use TOP RATED Software Like Solid Works, Autodesk Inventor, AutoCAD, and Creo Parametric. | Analysis and simulation of Product I use ANSYS. Extensive CAD proficiency in modeling with the part, Assembly, Sheet Metal, Weldments, Mold, Surface & Design Table, and modules using SolidWorks, AutoCAD, Inventor & Creo2.0. I have worked on 3D Printing modeling. I can create a 3D Model for 3D printing with the maintain accurate thickness. Proficient user of: - Creo Parametric - 3D modeling, assemblies, weldment, sheet metal, drafting. - SolidWorks - 3D modeling, assemblies, weldment, sheet metal, drafting, simulation, motion... - Autodesk Inventor - 3D modeling, assemblies, weldment, sheet metal, drafting. - ANSYS - FEA Analysis, Fatigue test, - Autodesk AutoCAD Development, Manufacturing & prototype Modelling, General Arrangement Layouts, P & ID, Create a new design/drawing by measuring the objective (Reverse Engineering ). Comprehensive knowledge of computer-aided engineering (CAD Design software) and GD&T. I demonstrated the ability to resolve a variety of issues and New Developments. (Such as High-Pressure triplex plunger pump, Food processing machinery, Bus Body structure and Pressure Vessels). In addition to this experience, I gained considerable Mechanical design and product development skills. I have also gain CAD Software skills (Like Solid-works, Inventor, Creo & AutoCAD) I have worked within four high-volume Mechanical companies as a Mechanical Design Engineer. I also bring to the table strong computer proficiencies in MS Word, MS Excel applications. Please see the accompanying resume for details of my experience and education. I am confident that I can offer you the new development, Modifications, CAD Software skills you are seeking.

I am a design engineer with expertise in cad software like Solidworks (surfacing mold design, sheet metal analytical part, drafting, assembly), AutoCAD 2d & 3d and also cam software like Mastercam

I am a design engineer with expertise in cad software like Solidworks (surfacing mold design, sheet metal analytical part, drafting, assembly), AutoCAD 2d & 3d and also cam software like Mastercam

PhD, Expert in Mechanical Design and Engineering Simulations; Professional mechanical engineer with 12 years experience in mechanical design. I can create the mechanical designs to transform your ide... Read more

PhD, Expert in Mechanical Design and Engineering Simulations; Professional mechanical engineer with 12 years experience in mechanical design. I can create the mechanical designs to transform your ideas from concept to prototypes or fully working machines. I am interested in the design for manufacturing, contains concept components, plastic parts, sheet metal, molding design, 3d printing, welding, bonding and CNC. I can also prepare assembly models, presentation for animations. I have good experience at usage of the softwares of Autodesk Inventor, Autocad, Solidworks, Autodesk Fusion. I use the professional engineering analysis and simulation softwares to perform the Structural Finite Element Analysis (FEA), Multi Body System Analysis (MBS), Rigid Body Dynamic Analysis, Discrete Element Analysis (DEM), Transient Structural Analysis and Explicit Dynamic Analysis. Key Skills: . Computer Aided Design . Engineering Analyses and Simulations . Engineerin Analysis using FEA methods on Ansys . Mutibody System Analysis . Discrete Element Analysis . 3D printing sofwares . Simulink Sim Mechanics . Autodesk Fusion 360 . Advanced techical report writing . Arduino IDE codes . Design of the Graphical User Interface (GUI)

1-Mostly, I drew the Aluminum injection molds, separated the mold, what the mold elements would be and I could create the technical drawings of the mold elements for production. First of all, I make a... Read more

1-Mostly, I drew the Aluminum injection molds, separated the mold, what the mold elements would be and I could create the technical drawings of the mold elements for production. First of all, I make all the controls of the 3d data you have according to the technical drawing, if it is a drawing that cannot be removed from the mold, we create the molding process, then I create the female mold and remove the separation line and make it male in the 3d environment. I take out the technical drawing of each element of the mold separately and file it. If desired, I offer the opportunity to make a presentation with a 3d pdf file. Injection Molding is serious business. Correct design of the mold is very important for the mold to have a long life and to work efficiently. If you want to work with an experienced and reliable person, I am ready to make an offer. 2-When you have an idea as a prototype, I can work together to help you draw the product you want in 3d. I have been designing metal injection molds by actively using Solidworks program for more than 15 years. Afterwards, I have been designing machinery for more than 3 years in a company that produces mining and concrete pumping machines. Reading Technical Drawing Part drawing and 3D Modeling specialist. I am proficient in creating cut lists for laser and plasma, and designing sheet metal or surface parts. I can prepare technical documents to manage the production, explain to the welder and CNC operator and have them manufactured, and work in accordance with teamwork. I specialize in surface modeling and solid modeling for product design to create a photorealistic (Render) view of the product. I can also work competently in modeling and animating any mechanism. I can also help you realize a design that can be produced with 3d printing. I am proficient in machining and chipless manufacturing processes.

I'm professional in 3D CAD design, I have experience in this field for more than 3 years. I've completed various project in this field such as for my colleague, personal project and my client, my serv... Read more

I'm professional in 3D CAD design, I have experience in this field for more than 3 years. I've completed various project in this field such as for my colleague, personal project and my client, my services are about : 2D / 3D modeling Mechanical Engineering. Design for 3D printing. Molding design. 2D/3D CAD Design. 3D Rendering. Rapid Prototyping. Blueprinting / Shop Drawing. Sketch to CAD Conversion (2D & 3D). CAD file conversion. Reverse Engineering. My services are not limited to the above categories since I like to learn something new and make a contribution to complete your project. I am very happy and motivated to assist you in your project with my skills and experience. Happy to discuss and assist your project in the future. Tatan.

Hello, I am experienced in the field of CAD/ 3D-MODELING, Product Design and developing. I can provide you work as per your requirement, any design with high proficiency and within the time. Some of m... Read more

Hello, I am experienced in the field of CAD/ 3D-MODELING, Product Design and developing. I can provide you work as per your requirement, any design with high proficiency and within the time. Some of my skills are listed below for your convenience- 1. unigraphics cad/cam 2. solidworks 3.catia v5 4.ptc creo 5.collabcad

I am a Mechanical Design Engineer with over 5 years of hands-on experience in the full product development cycle — from initial concept and 3D modeling in SolidWorks to machining, manufacturing, and f... Read more

I am a Mechanical Design Engineer with over 5 years of hands-on experience in the full product development cycle — from initial concept and 3D modeling in SolidWorks to machining, manufacturing, and final assembly. My Core Expertise: Laboratory Equipment Design — I specialize in designing and building standard-compliant test and measurement instruments Advanced SolidWorks modeling (parts, assemblies, sheet metal, surfacing) Design for Manufacturing (DFM) — I design parts that are actually producible Design for Assembly (DFA) — optimizing designs for easy and cost-effective assembly CNC machining & programming — I understand manufacturing processes deeply Reverse engineering and 2D-to-3D conversion FEA (Finite Element Analysis) using Abaqus — I simulate and optimize designs Injection molding & tooling design for mass production Process optimization using Design of Experiments (DOE) Notable Laboratory Equipment Projects (ISO, ASTM, INSO Compliant): Izod/Charpy Impact Tester (ISO 180, ASTM D256) Abrasion Resistance Tester (ASTM D4060) Pencil Hardness Tester (ASTM D3363) Cross-Cut Adhesion Tester (ASTM D3359) 25-Ton Hot Press (up to 250°C) ESCR Test Fixture (ASTM D883) 55L Forced-Air Laboratory Oven Pneumatic Leak Test Stands (ISO 13255) Other Key Industrial Projects: Designed and manufactured 200 industrial burner and cutting band units for MBICO Optimized mixer blade geometry and coating for Sangan Iron Ore Complex (SIC) Produced 10,000+ automotive door handles (Pride & Peugeot) from design to injection molding Designed, manufactured, and programmed a 6-axis mini industrial robot Software Proficiency: SolidWorks (advanced modeling, assemblies, drawings) Abaqus (FEA, structural simulation) AutoCAD (2D drafting, manufacturing drawings) MATLAB (data analysis, numerical computing) PowerMill (CNC programming) Currently pursuing my Master's degree in Mechanical Engineering (Manufacturing) at Ferdowsi University of Mashhad, researching the clinching process — a non-thermal sheet metal joining method. I take pride in turning ideas into real, working products — and I am committed to delivering excellence in every project I take on. If you need a reliable engineer for your laboratory equipment or industrial project, let's talk!

I am a Senior Mechanical Engineer with over 10 years of experience in designing and manufacturing electronic product enclosures and hardware. My expertise spans the full product development lifecycle,... Read more

I am a Senior Mechanical Engineer with over 10 years of experience in designing and manufacturing electronic product enclosures and hardware. My expertise spans the full product development lifecycle, from conceptual design and CAD modeling to production management and quality control. I leverage tools like SolidWorks, CorelDraw, and Keyshot to create innovative designs that meet industry standards while ensuring aesthetic appeal and user-friendly interfaces. If you're looking for a skilled engineer who can bring your product concept to reality with precision and creativity, let's discuss your project. I am ready to help you achieve your goals and exceed your expectations. Mechanical & Industrial Design: - Machine Elements Design, Enclosure & Hardware Design, Body & Chassis Design, Material Selection, Design for Manufacturing and Assembly (DFM/DFA), PCB Mechanical Integration, Electro-Mechanical Compatibility - Visual & Product Design: Photorealistic product rendering and visualization, graphic design & printing preparation, aesthetic design, UI/UX integration for product interfaces. Manufacturing & Production: - CNC Sheet Metal Forming, CNC Machining, CNC Laser Cutting, 3D-Printing, Vacuum Casting, SMC-BMC Molding, Injection Molding, Die Casting, Welding, Surface Treatments, Finishing, Powder Coating, Anodizing, UV Printing - BOM, OPC, FPC, QC, Technical and financial reports, cost/time estimation, Rapid Prototyping, Low-Quantity & Batch Production, Mass Production, AI-assisted Lean Manufacturing Software: - SolidWorks CAD/CAE/CAM, CorelDraw, KeyShot, Solidworks Simulation & Flow Simulation Soft Skills: - Project Management, Contract Negotiation, Technical Communication, Creative Problem Solving, Team Collaboration: Cross-functional coordination with electronic engineers, PCB designers, and product managers for integrated product development.

Hello my name is Mojtaba Shahbazi.I am 29 I have 9 over years of experience in about plastic injection mold. I can do product and plastic mold design also I can work with catia soft wares and rhino.I... Read more

Hello my name is Mojtaba Shahbazi.I am 29 I have 9 over years of experience in about plastic injection mold. I can do product and plastic mold design also I can work with catia soft wares and rhino.I also have experience in the fields of producing toys and Home appliances, automotive, electrical, etc....

Bachelors in Engineering (B.E) from Mumbai University. 8 years of experience in CAD , 3d modeling , 2D modeling.

Bachelors in Engineering (B.E) from Mumbai University. 8 years of experience in CAD , 3d modeling , 2D modeling.

Certified SolidWorks Professional (CSWP) | Top Rated | 300+ product design projects delivered I turn product ideas into manufacturable designs. From concept CAD to simulation, production drawings, an... Read more

Certified SolidWorks Professional (CSWP) | Top Rated | 300+ product design projects delivered I turn product ideas into manufacturable designs. From concept CAD to simulation, production drawings, and prototypes, I handle the engineering details so you can focus on your product and your customers. I've worked with 15+ startups and established companies, including Heisha Tech (Shenzhen) and Team-mb (Berlin), taking products from concept to production-ready files. WHAT I DO • 3D CAD Modeling: solid and surface modeling, sheet metal, injection-molded parts, assemblies, tolerance stack-up analysis • Engineering Drawings & GD&T: manufacturing-ready 2D drawings for CNC, mass production, and 3D printing, plus patent drawings • FEA & CFD Simulation: structural, thermal, fluid flow, and multiphysics analysis to optimize designs before you build • Design for Manufacturing & Prototyping: DFM review, print-ready designs, functional prototypes • Rendering & Animation: product renders and animations for pitches, marketing, and patents GOOD FIT IF YOU • Are launching a consumer or industrial product and need CAD, prototyping, or injection molding design • Want tolerance-aware drawings your manufacturer can build from without back-and-forth • Are filing a patent and need clear engineering drawings • Want an engineer who manages technical details and communicates clearly BEYOND CLIENT WORK I also create engineering content, designing and documenting DIY projects and sharing the project files on my own website. One example is a 3D-printable setup for making an extrusion screw at home using an angle grinder. It's a good look at how I approach design problems from idea to working build. Message me and I'll send you the link. HOW TO START Send a message or invite me to your job with a short description of your product, goals, and timeline. I'm happy to share relevant past work so you can judge my approach. TOOLS: SolidWorks (CSWP), Fusion 360, Blender, and industry-standard CAE tools. Keywords: mechanical design, SolidWorks, 3D CAD, FEA, CFD, sheet metal, injection molding, GD&T, engineering drawings, DFM, 3D printing, prototyping, product design

I’m a Plastic Product Design Engineer with over 7 years of experience in injection molding design, product development, and production support. I specialize in creating innovative, manufacturable, and... Read more

I’m a Plastic Product Design Engineer with over 7 years of experience in injection molding design, product development, and production support. I specialize in creating innovative, manufacturable, and cost-effective plastic components using SolidWorks and AutoCAD. My expertise covers the complete product development cycle — from concept design and 3D modeling to detailed drafting, mold feasibility, and production optimization. Having worked closely with production and maintenance teams, I bring a strong practical understanding of tooling and process parameters, ensuring designs are ready for real-world manufacturing. I’m passionate about transforming ideas into functional designs that meet both performance and aesthetic goals. With a focus on quality, precision, and timely delivery, I aim to add value to every project I undertake. Core Skills: Plastic Product Design (Injection Molding) 3D Modeling & 2D Drafting (SolidWorks, AutoCAD) Mold Design Understanding Reverse Engineering & Product Optimization Prototype Development & NPD

Mechanical engineering bachelor, experienced in plastic molding injection (parts design/modeling using SolidWorks). My academic skills are generally in M.engineering field (CAD, 3D/2D modeling. techni... Read more

Mechanical engineering bachelor, experienced in plastic molding injection (parts design/modeling using SolidWorks). My academic skills are generally in M.engineering field (CAD, 3D/2D modeling. technical/mechanical solutions, mechanisms building/optimisation).

Engineer specialized in engineering and product design, with 15 years of experience as an Innovation and Development Engineer in manufacturers of plastic products. Management of projects related to th... Read more

Engineer specialized in engineering and product design, with 15 years of experience as an Innovation and Development Engineer in manufacturers of plastic products. Management of projects related to the development of products and their processes. Development of industrial products from their idea to their release to the market, manufacturing and implementation of applied means of production (Molds, machinery and tooling). Extensive experience in designing plastic products in injection and extrusion blow molding processes. Advanced skills in CAD design and modeling software (Solid Edge, Autocad and Rhinoceros). Advanced knowledge in GEN 3 TRIZ methodology (engineering problem solving through skills focused on innovation). Strategic knowledge about platforms and product families.

Worked as a Packaging Design Engineer for an automotive company for over 8 years designing car instrument clusters. My specialty is part design and modelling using UG Nx software. Creation of manufact... Read more

Worked as a Packaging Design Engineer for an automotive company for over 8 years designing car instrument clusters. My specialty is part design and modelling using UG Nx software. Creation of manufacturing drawings for those designs also included. A brief overview of my work: - Receive and discuss product design request from customer. - Provide initial quotations and design proposals. - Proceed with 3D design until customer requirements are met. - Create production drawings for suppliers and quality control. As needed: - Structural strength simulation. - Injection molding design considerations. - Appearance and overall quality improvement. - Project management and coordination. Languages: - English (Fluent) - Japanese (JLPT N2, Conversational, Expatriated for 3 years)

✅ 3D Product Modeling & Mechanical Design – From concept sketches to final assemblies, ensuring precision, function, and aesthetics. ✅ Design for Manufacturability and Assembly (DFM & DFA) – Minimiz... Read more

✅ 3D Product Modeling & Mechanical Design – From concept sketches to final assemblies, ensuring precision, function, and aesthetics. ✅ Design for Manufacturability and Assembly (DFM & DFA) – Minimize production cost and complexity while maximizing efficiency and quality. ✅ Injection Molding Design – Mold-ready parts with the right draft angles, wall thicknesses, and split lines. ✅ Sheet Metal & Weldments – Robust designs for brackets, enclosures, and structural frames using efficient fabrication methods. ✅ Surface & Hybrid Modeling – Combine curves and solids for complex, eye-catching designs that perform. ✅ Engineering Drawings & GD&T – Manufacturing-ready documentation with clear tolerances and specifications as per ASME Y14.5. ✅ Motion Analysis & FEA Simulation – Validate the structural integrity of the design before manufacturing using ANSYS and MSC APEX/PATRAN/NASTRAN. ✅ DFM for 3D Printing - Designs tailored to specific 3D printing processes, ensuring full compliance with design standards like clearance tolerances, overhang angles, and printability constraints.

I am an injection mold designer, had worked in two mold maker companies, but now I am a teacher in the field of plastic injection molding expertise

I am an injection mold designer, had worked in two mold maker companies, but now I am a teacher in the field of plastic injection molding expertise

I am an Indonesian, DESIGN is my passion, AVIATION is what I do, and AERONAUTICS is my soul. 7 years experienced as mechanical and aeronautical design engineer can help you to get a reliable desig... Read more

I am an Indonesian, DESIGN is my passion, AVIATION is what I do, and AERONAUTICS is my soul. 7 years experienced as mechanical and aeronautical design engineer can help you to get a reliable design that compliance with DRO or design specification. Based on my academic background, research projects, and working experiences, I can offer you following services: - Technical Drawing - Product Design for 3D printing - Injection Molding Design - Technical Drawing for CNC Machine - 3D modeling and 2D drawing using SolidWorks or AutoCAD - Prototype Design for testing - RC Aircraft / UAV Design As a professional engineer, I always committed to deliver best result to my client as per requested Product Design Specification, with technically-proofed design (Design for Manufacturing, Design for Assembly) and prepossessing artistic appearance. Looking forward to work with you and create a design that will exceed your expectation! *Build a SIMPLE, SMART and STYLISH design for you*

Machine desing Mechanical part desing Assembly 2D to 3D, paper to 3D etc. conversation PLC programming EPlan desing

Machine desing Mechanical part desing Assembly 2D to 3D, paper to 3D etc. conversation PLC programming EPlan desing

I am a self-taught mechanical designer with expertise in 3D modeling and product development using SolidWorks, Unigraphic NX (NX), and CATIA I have honed my skills through hands-on projects and pract... Read more

I am a self-taught mechanical designer with expertise in 3D modeling and product development using SolidWorks, Unigraphic NX (NX), and CATIA I have honed my skills through hands-on projects and practical experience. My strengths include: Proficiency in CAD Software: SolidWorks, NX for part design and injection die molding designer. Specialized in injection mold design

I always work with everyone I can to improve myself. At the same time, I also want to work part-time to earn more income for myself and my family. I do any job, even the smallest, very meticulous an... Read more

I always work with everyone I can to improve myself. At the same time, I also want to work part-time to earn more income for myself and my family. I do any job, even the smallest, very meticulous and clear Honestly, I come here to earn more income and improve myself. With more than 5 years of experience, I hope to be of great help to you. add me for work: whatsap: +84975199632 ▒▒▒▒▒: ▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒ grabcad: https://grabcad.com/mr.k-23

Hi! I'm Mathias,during my scholarship I spent 15h/week for two years on solidworks. I'm really used to this software, we used it to conduct molding studies (drafts, molds, cores, etc..), mechanical si... Read more

Hi! I'm Mathias,during my scholarship I spent 15h/week for two years on solidworks. I'm really used to this software, we used it to conduct molding studies (drafts, molds, cores, etc..), mechanical simulation, flow simulation and hardening simulation (used to see if there can be problems inside the part). I am now using cad softwares to create jewels. I will create any model/assembly for you, from drawings, pictures or 2d plans.

Hi, I am a Mechanical Engineer, and I had done CAD-CAM TOOL DESIGN; and I am a professional in Plastic Injection Mold Design and Product design. We also having a manufacturing department of inject... Read more

Hi, I am a Mechanical Engineer, and I had done CAD-CAM TOOL DESIGN; and I am a professional in Plastic Injection Mold Design and Product design. We also having a manufacturing department of injection mold tool as well as Presstool washer of any material like Stainless Steel, Copper, Brass, Mild Steel ,etc.I know CREO PARAMETRIC 2.0, SOLID WORKS Softwares. I can make a 3d model as per your drawing and also create detailing in AutoCAD. I had an experience of Autocad, CATIA, ANSYS and CREO PARAMETRIC software that has given me a piece of good knowledge. With this software, I can complete the project as soon as possible. Now I can make a die casting design with the help of solidworks. I can also make a mold of any part like silicon mold design and rubber mold design . THANK YOU.

As a Mechanical CAD Designer with 5+ years of experience, I specialize in Injection Molding part design, Scan to CAD, and converting technical drawings into 3D models using CATIA V5. I work with manu... Read more

As a Mechanical CAD Designer with 5+ years of experience, I specialize in Injection Molding part design, Scan to CAD, and converting technical drawings into 3D models using CATIA V5. I work with manufacturers and product designers to create accurate, high-quality 3D models for injection-molded parts, ensuring functionality and manufacturability. My skills include reverse engineering (Scan to CAD), designing for injection molding, and creating detailed technical drawings with clear GD&T specifications for production. My services include: Injection Molding Design: Drafting, modeling, and optimizing parts for injection molding Scan to CAD: Converting 3D scan data to precise CAD models Technical Drawings & 3D Models: Creating detailed 2D drawings and 3D parts, including tolerances and material specifications I am committed to clear communication, fast turnaround times, and delivering designs that meet client needs and manufacturing standards.

I am a Mechanical Designer with over 8 years of experience specializing in 3D modeling, 2D drawings, assembly drawings, and product design. My expertise spans multiple industries, including manufactur... Read more

I am a Mechanical Designer with over 8 years of experience specializing in 3D modeling, 2D drawings, assembly drawings, and product design. My expertise spans multiple industries, including manufacturing, automotive, and molding. Currently, I am working with a German company in Pakistan, handling design projects for German clients in the CNC machine molding industry. I hold an Associate Mechanical Engineering degree, and I have extensive hands-on experience with industry-standard design tools such as SolidWorks, Creo 10.0, and CATIA V5. My core competencies include: 3D modeling, 2D drawings, and assembly drawings for automotive parts and sheet metal components. Managing client projects and delivering CATIA V5-based designs for BMW vendors, ensuring the highest quality and compliance with client specifications. Designing complex automotive parts, sheet metal components, and molding designs for CNC machines. SolidWorks Rendering using KeyShot, offering realistic product visualizations for clients before production. Key Accomplishments: Successfully delivering automotive and sheet metal designs for BMW vendors using CATIA V5, meeting precise client specifications. Leading product design and rendering efforts with KeyShot, helping clients visualize the final product before manufacturing. Collaborating with international clients and efficiently handling end-to-end design projects from concept to delivery. I am passionate about creating innovative, efficient, and aesthetic designs. With my experience in Mechanical Engineering and a strong background in CAD software, I am confident in my ability to tackle complex design challenges and deliver high-quality solutions that meet client needs.

* Project Management * GD&T Y 14.5 * Plastic product design & Engineering * Sheet Metal Fabrication * Injection Molding, Vacuum Molding, Extrusion Molding & Blow Molding * Design ideas for Refrigerat... Read more

* Project Management * GD&T Y 14.5 * Plastic product design & Engineering * Sheet Metal Fabrication * Injection Molding, Vacuum Molding, Extrusion Molding & Blow Molding * Design ideas for Refrigerator under IEC 62552 1-3