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                                  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

                                    
                                   
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