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2.6
ELECTRICAL CONNECTION
Electrical connection should be performed in compliance with the IEC regulations, only by authorised and competent per-
sonnel. In the first instance, examine the data shown on the technical data table of this manual, on the serial plate and on the
electrical diagram. The envisaged connection is of the fixed type.
IMPORTANT: Ahead of each unit it is necessary to install an omnipolar main breaker, having a spacing among contacts of
at least 3mm; example:
- manual breaker of appropriate capacity, complete with fuse valves
- automatic breaker with respective magnetothermal relays..
2.6.1
EARTHING
It is essential to earth the unit.
To this purpose, it is necessary to connect to an efficient earthing system the terminals marked with the symbols (
on the line-receiving terminal box. The earthing system should comply with the law in force.
SPECIFIC WARNINGS
The electrical safety of this unit is assured only when it is correctly connected to an efficient earthing system as stated
in the electrical safety regulations in force; the Manufacturer declines any responsibility for the non-compliance with
these safety regulations.
It is necessary to verify this fundamental safety requisite and, in case of doubt, ask for an accurate testing of the system by
professionally qualified personnel.
The Manufacturer cannot be deemed responsible for any damages caused by the lack of unit earthing.
ATTENTION: NEVER INTERRUPT THE EARTH WIRE (Yellow-Green).
2.6.2
EQUIPOTENTIAL
The unit should be included within an equipotential system whose efficiency must be tested according to the law in force.
The screw marked with the label "Equipotential" is located near the terminal box on the base.
2.6.3
POWER SUPPLY CABLE
The unit is supplied fitted for the following voltages:
The flexible cable for power supply connection should not have characteristics lower than the rubber insulation type H07RN-
F. The cable should be inserted through the cable clamp and firmly fastened. Furthermore, the supply voltage with the unit
functioning should not go outside the value of the nominal tension ±10%.
To have access to the terminal box in order to connect the unit to a supply network having different characteristics from those
provided for, or to replace the supply cable, you need to:
- remove the front panel (top or top + cabinet)
- connect the cable to the terminal box according to need, and following the instructions shown on the provided label near
the terminal bord and on the present booklet.
SUPPLY VOLTAGE TYPE
3N AC 380...415 V 50/60 Hz
2N AC 380...415 V 50/60 Hz
3 AC 220...240 V 50/60 Hz
1N AC 220...240 V 50/60 Hz
ELECTRICAL DIAGRAM
3N AC 380...415V; 3 AC 220...240V; 1N AC 220...240V 50/60 Hz.
MODEL
drawing n°
E77/PL4T
E77/PLCD4T
E77/PR4T
E77/PRC4T
Max
n° cables
A/f
mm
2
5,63
5 x 1,5
11,25
4 x 1,5
9,743
4 x 1,5
16,88
3 x 2,5
1147
- 13 -
E77/PL7T
E77/PLCD7T
E77/PR7T
E77/PRC7T
E77/PM7T
E77/PMCD7T
Max
n° cables
A/f
mm
2
5,63
5 x 1,5
11,25
4 x 1,5
9,743
4 x 1,5
16,88
3 x 2,5
1149
Tab.2
) placed
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