ABB CI810V1 Analog module industrial system controller

Description

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– non-conducting locations: locations with a particular resistance value of
insulating floors and walls (≥ 50 kΩ for Ur ≤ 500 V; ≥ 100 kΩ for Ur > 500 V)
and without protective conductors inside
– electrical separation, e.g. by using an isolating transformer to supply the circuit;
– earth-free local equipotential bonding: locations where the exposed conductive
parts are connected together but not earthed.
Finally, the following measures provide combined protection against both direct
and indirect contact:
– SELV (Safety Extra Low Voltage) system and PELV (Protective Extra Low
Voltage) system;
– FELV (Functional Extra Low Voltage) system.
The protection against both direct and indirect contact is ensured if the
requirements stated in 411 from IEC 60364-4-41 are fulfilled; particularly:
– the rated voltage shall not exceeds 50 V ac r.m.s. and 120 V ripple-free dc;
– the supply shall be a SELV or PELV source;
– all the installation conditions provided for such types of electrical circuits shall
be fulfilled.
A SELV circuit has the following characteristics:
1) it is supplied by an independent source or by a safety source. Independent
sources are batteries or diesel-driven generators. Safety sources are supplies
obtained through an isolating transformer;
2) there are no earthed points. The earthing of both the exposed conductive
parts as well as of the live parts of a SELV circuit is forbidden;
3) it shall be separated from other electrical systems. The separation of a SELV
system from other circuits shall be guaranteed for all the components; for
this purpose, the conductors of the SELV circuit may be contained in multiconductor cables or may be provided with an additional insulating sheath.
A PELV circuit has the same prescription of a SELV system, except for the
prohibition of earthed points; in fact in PELV circuits, at least one point is always
earthed.