ABB CI830 Analog module industrial system controller

Description

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-FELV circuits are used when for functional reasons the requirements for SELV
or PELV circuits cannot be fulfilled; they require compliance with the following rules:
a) protection against direct contact shall be provided by either:
– barriers or enclosures with degree of protection in
accordance with what stated above (measures of protection
against direct contact);
– insulation corresponding to the minimum test voltage
specified for the primary circuit. If this test is not passed, the
insulation of accessible non-conductive parts of the
equipment shall be reinforced during erection so that it can
withstand a test voltage of 1500 V ac r.m.s. for 1 min.;
b) protection against indirect contact shall be provided by:
– connection of the exposed conductive parts of the
equipment of the FELV circuit to the protective conductor of
the primary circuit, provided that the latter is subject to one
of the measures of protection against direct contact;
– connection of a live conductor of the FELV circuit to the
protective conductor of the primary circuit provided that an
automatic disconnection of the supply is applied as measure
of protection;
c) plugs of FELV systems shall not be able to enter socket-outlets
of other voltage systems, and plugs of other voltage systems
shall not be able to enter socket-outlets of FELV systems.
Figure 1 shows the main features of SELV, PELV and FELV systems