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Themain 10 functions
of standard IEC 61439
For each of the following 10 functions, the standard IEC 61439 requires design
verifications from the system manufacturer - mainly through type-tests - and
routine verifications on each panel from the Panel Builder to achieve 3 basic goals:
safety, continuity of service and compliance with end-user requirements.
Continuityof service
Maintenance andmodification capability
Capability to preserve continuity of supply without impairing safety during
assembly
maintenance or modification
> Electrical condition of the
assembly
or various circuits
> Speed of exchange of the functional units
> Test facilities…
Electro-Magnetic compatibility
To properly function (immunity) and not to generate EM disturbances (emission) in specified environmental conditions:
> Industrial networks or locations (Environment A)
> Domestic, commercial, and light industrial locations (Environment B).
Compliancewithend-user requirements
Capability tooperate the electrical installation
To properly function, according to:
> The electrical diagram of the overall system and related information (voltages, coordination…)
> The specified operating facilities (e.g. free or restricted access to Man Machine Interfaces, isolation of the outgoing circuits…).
Capability tobe installedon site
> To withstand handling, transport, storage… and installation constraints
> Capability to be erected and connected (type of enclosure, type, material and cross sectional areas of external conductors).
Protectionof the
assembly
againstmechanical andatmosphericenvironmental conditions
> Presence of water or solid foreign bodies (IP according to IEC 60529)
> External mechanical impacts (optional IK according to IEC 62262)
> Indoor or outdoor installation (humidity, UV).
Safety
Voltage stresseswithstand capability
To withstand long term voltages, and transient and temporary overvoltages according to the insulation coordination principles
and requirements.
Current-carrying capability
To protect against burns and to withstand temperature rise:
> when any circuit is continuously loaded, alone, to the specified current
> when the
assembly
is loaded to the specified current according to the specified load pattern (between circuits and/or as
a function of the time).
Short-circuit withstand capability
To withstand the stresses resulting from the prospective short-circuit current and from the associated data (High forces between
conductors, temp. rise in a very short time, air ionization, overpressure).
Protection against electric shock
> Hazardous-live-parts not to be accessible (basic protection)
> Accessible conductive parts not to become hazardous-live (fault protection).
Protection against risk of fireor explosion
> Resistance to internal glowing elements
>
Note:
protection of persons, and optional protection of the
assembly
, against arcing due to internal fault can be specified through
a "special test" according to IEC 61641.
Presentation
IEC 61439 standard