Electrical Connection; Ground Connection; Connection To Main Power Supply; 6.5.3 Current Transformer (Ct) Connection - ORTEA NEXT ICAR MICROmatic Manuel D'installation

ICAR by ORTEA NEXT
6.5 E
LECTRICAL CONNECTION
DANGER T
HE ELECTRICAL CONNECTION MUST BE CARRIED OUT BY TRAINED AND QUALIFIED PERSONNEL
. A
INVOLVED RISKS LWAYS USE SUITABLE TOOLS AND
BE CARRIED OUT IN CONFORMITY WITH THE RULES AND REGULATIONS ENFORCED IN THE
Note The cross-section value of the cables/bars for the connection to mains and load falls entirely under
the installer's responsibility. The Manufacturer shall not be held liable for any damage that might occur to
people or belongings due to an incorrect choice.
Open the cubicle and locate the connection terminals. Prepare the connection cables/bars with regard to the
current values and make them go through the openings prepared on purpose trying to avoid kinks and
accidental contact between the cables and the electric components.
6.5.1

Ground connection

The very first operation is to connect the earth wire to the terminal identified by PE, GRD or the symbol G.
DANGER T
HE EARTH CONDUCTOR MUST NEVER BE ELECTRICALLY INTERRUPTED NEITHER INSIDE NOR OUTSIDE THE UNIT
The earth wire cross-section must be chosen in conformity to the regulations in force. Therefore, depending
on the phase cable cross-section, the earth wire cross-section should respect the values in the table below:
P -
HASE CABLE CROSS
S ≤ 16
16 < S ≤ 35
35 < S ≤ 400
400 < S ≤ 800
S > 800
Note If a not standardised cross-section is determined, the nearest larger one should be chosen.
6.5.2

Connection to main power supply

The three phases of the mains should be connected, via adequately sized power cables (refer to annex E), to
the terminals of the load disconnect switch marked by the letters L1, L2 and L3 (R, S and T) respectively.
The table below shows the load break switch terminal distance from the base of the equipment (*)
CABINET HEIGHT [mm]
1760
1960
2160
2360
(*) Distances apply only to the MULTImatic cabinets in the catalogue.

6.5.3 Current Transformer (CT) connection

Connect terminals S1 and S2 (S11 and S12 in MIDImatic and MULTImatic units) to the secondary of a current
transformer (not supplied) with 5A secondary current connected on phase L1 (R) (see Annex B). In order to
ensure the correct operation of the automatic control it is essential for the unit to be connected as described
in the above mentioned annex, which also illustrates some typical connection mistakes.
Being the current transformer a measuring instrument and not merely a display instrument, it should
possess certain characteristics, besides being of high quality:
CT Apparent power
The Apparent Power of the current transformer (expressed in VA) should be such as to meet the self-
consumption of both the controller current input and the connecting cable (see table below).
CABLE SIZE
2,5 
4
6
10
16
 For each 10°C variation in temperature, the VA absorbed by the cables increase by 4%; the values given
above are deduced from typical resistances of flexible cables, class 5
 Minimum size of connection of cables between current transformer and controller.
CT amperage
The primary amperage of the current transformer should be determined by the user solely in relation to the
current drawn by the load that needs to be corrected.
CT position
S [sqmm]
SECTION
250
455
[mm ]
2
P P E
ERSONAL ROTECTIVE QUIPMENT
E
ARTH WIRE MIN CROSS
-
LOAD BREAK SWITCH SIZE
400
DISTANCE
405
353
303
VA
PER METER OF CABLE AT
20 / 40
MAT189 jun19
,
(PPE). T
HE OPERATIONS MUST
C
OUNTRY OF INSTALLATION
- [sqmm]
SECTION
S
16
S/2
200
S/4
[ ]
A
630 800
[mm]
395 380
342 325
290 280
265 255
20°C 
0,41
0,254
0,169
0,0975
0,062
AWARE OF THE
.
.
1250
367
320
268
240