ABB TC820-1 After sales service is provided for the control card of the power supply device

Description

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Further values of k can be taken from the Tables in Annex D, which provides
the formula for accurate calculation of the value of k.
If Table 2 or formula (1) do not provide a standardized cross section, a larger
standardized cross section shall be chosen.
Regardless of whether Table 2 or formula (1) are used, the cross section of the
protective conductor, which is not part of the supply cable, shall be at least:
– 2.5 mm2
Cu/16 mm2
Al, if a mechanical protection is provided;
– 4 mm2
Cu/16 mm2
Al, if no mechanical protection is provided.

For current using equipment intended for permanent connection and with a
protective conductor current exceeding 10 mA, reinforced protective conductors
shall be designed as follows:
• either the protective conductor shall have a cross-sectional area of at least
10 mm2 Cu or 16 mm2
Al, through its total run;
• or a second protective conductor of at least the same cross-sectional area
as required for protection against indirect contact shall be laid up to a point
where the protective conductor has a cross-sectional area not less than
10 mm2
Cu or 16 mm2
Al. This requires that the appliance has a separate
terminal for a second protective conductor.
When overcurrent protective devices are used for protection against electric
shock, the protective conductor shall be incorporated in the same wiring system
as the live conductors or be located in their immediate proximity