Select your country/region in the menu or by clicking on the world map *
Country Selector Alternate Image
Panelbuilders
                                                         
                                                         
                                                         

                                                        10 functions to define the IEC 61439-1&2 standard

                                                         
                                                         

                                                        All the verifications proposed by standard IEC 61439 contribute to the achievement of 3 basic goals and 10 functions:
                                                        > The 5 Safety functions
                                                        > The 2 Continuity of Service functions
                                                        > The 3 Compliance with End-User Requirements functions 

                                                        10 functions to define the new IEC standard 61439-1&2 : the 5 safety functions The 5 Safety functions

                                                        Voltage stress withstand capability 
                                                        Needs & design requirements Design verification Routine verification
                                                             
                                                        Insulation to withstand long-term voltages
                                                        and transient and temporary overvoltages guaranteed through clearances, creepage distances and solid insulation.
                                                        • Measurement of clearances and creepage distances
                                                        • Power frequency dielectric test
                                                        • Impulse withstand voltage test, when clearances are greater than specified values
                                                        • Visual inspection of clearances (subject to design conditions and creepage distances).
                                                        • Power frequency dielectric test
                                                             
                                                        Current-carrying capability
                                                        Needs & design requirements Design verification Routine verification
                                                             

                                                        Protection against burns by limiting
                                                        excessive temperatures:

                                                        • when any single circuit is continuously loaded to its rated current and.
                                                        • when any circuit is continuously loaded to its rated current multiplied by its rated diversity factor.
                                                        • Temperature rise tests
                                                        • Either comparison with a tested reference design, under restrictive conditions
                                                        • Or, under very restrictive conditions, calculations with safety margins (including 20% derating of devices)
                                                        • Visual inspection
                                                        • Random verification of tightness
                                                             
                                                        Short-circuit withstand capability
                                                        Needs & design requirements Design verification Routine verification
                                                             
                                                        Capability to withstand short circuits thanks  to short-circuit protection devices, short-circuit coordination, and capability to withstand the stresses resulting from short-circuit currents in all conductors.
                                                        • Short-circuit testing (Isc and Icw) of the main circuit, including the neutral conductor, and of the protection circuit.
                                                        • Or comparison with a tested reference design under restrictive conditions
                                                        • Visual inspection
                                                             
                                                        Protection against electric shock 
                                                        Needs & design requirements Design verification Routine verification
                                                             
                                                        Hazardous live parts are not accessible
                                                        (basic insulation protection) and accessible conductive parts are not hazardous for life
                                                        (fault protection, and continuity of protective equipotential bonding).
                                                        • IP XXB test and verification of insulating materials
                                                        • Mechanical operation tests
                                                        • Verification of dielectric properties
                                                        • Measurement of the resistance between each exposed conductive part and the PE terminal
                                                        • Short-circuit strength of the protection circuit
                                                        • Visual inspection of basic and fault protection
                                                        • Random verification of
                                                          tightness of the protective
                                                          circuit connections
                                                             
                                                        Protection against fire or explosion hazard 
                                                        Needs & design requirements Design verification Routine verification
                                                             
                                                        Protect persons against fire hazard: resistance to internal glowing faulty
                                                        elements, through selection of materials and various design provisions.
                                                        • Glow wire test
                                                        • Special test according to IEC TR 61641, where specified
                                                        None

                                                         
                                                         
                                                         
                                                         
                                                         
                                                        Around the world
                                                          
                                                         
                                                        To know more

                                                        To know more 

                                                        Requests for Products and Services information

                                                         

                                                        Switchboards Offer

                                                         

                                                        IEC standards

                                                         

                                                        IEC 61439 Guide and FAQs

                                                         

                                                        Panelbuilder’s team

                                                         

                                                        Panelbuilders newsletter

                                                         

                                                        Products & Services