ABB 500 Series, Руководство строителя

Страница: 66 / 134

60
Making the electrical connections
&KDSWHU
(OHFWULFDOFRQQHFWLRQV
0DNLQJWKHHOHFWULFDOFRQQHFWLRQV
&RQQHFWLRQWRSURWHFWLYHHDUWK
When, for example, a terminal is mounted in a cubicle, it shall be connected to protec-
tive earth with a green/yellow conductor with a cross section area of at least 2.5 mm
2
(AWG 12). The connection shall be made from the terminals earthing screw (on the rear
side) to the cubicles frame with a conductor <10 cm long or as short as possible,
see
figure 28 .
The cubicle frame must be connected to a copper earthed bar or equivalent, with a con-
ductor that must have cross section of at least 4 mm
2
and as short as possible. The cop-
per bar should preferably run along a row of cubicles.
0DNHWKHHOHFWULFDOFRQQHFWLRQV
The wiring from the cubicle terminals to the 500 relay terminal, must be made in accor-
dance with the established guidelines for this type of equipment (see Installation guide
1MRK 500 005-MEN, chapter 3, “wiring of relay assemblies). The wires from binary
inputs and outputs and the auxiliary supply must be routed separately from the current
transformer cables between the cubicle terminals and the relay terminal.
&RQQHFWLRQRIWKH&7FLUFXLWV;
CT’s are to be connected to the 12-pole Weidmuller type DFK 6/12 connector known
as“feed-through” terminal blocks for conductors with cross section areas:
• Use a solid conductor between 2.5 - 6.0 mm2 (AWG 14-10)
• Use a stranded conductor between 2.5 - 4.0 mm2 (AWG 14-12)