Precautions For Connecting - Mitsubishi Electric V Series Instruction Manual

8.2 Precautions for connecting

Use M12 bolts, plain washers, and spring washers to connect the conductor. Clean the surface of conductor
to be connected to the (silver plating) terminal of circuit breaker and securely tighten the bolts with a correct
torque (M12: 45±5 N·m).
The circuit breaker terminal which is applicable to connect the conductor is different depending on the shape
of the terminal.
Tightening torque
Screw size Tightening torque (N·m)
M12 45±5
CAUTION
Conductor
strip
Circuit
breaker
Bolt
Circuit breaker
terminal
Arrange the conductor strip to contact the
terminal of the circuit breaker securely.
And fix the conductor strip with a bolt so that no
force is applied to any direction of the terminal.
Since the fault current flowing through the conductors causes large electromagnetic forces, the conductors
should be secured firmly, using the values in the below table as a reference. The distance between the fixing
support and the circuit breaker conductor strip should be less than 200 mm.
Electromagnetic force in N per 1 m conductor (3-phase short circuit)
Type
Conductor distance (mm)
Prospective fault current kA (pf)
30 (0.2)
42 (0.2)
50 (0.2)
Ensure that they have a sufficient current capacity. Refer to the following table.
Conductor size (Ambient temperature: 40° C at open air)
(Compliance with IEC 60947-1)
Rated current
connecting max. (A)
Arrangement
630
1000
With long
surface vertical
1250
1600
(Note) The values indicate the quantity per pole and terminal.
(Note)
The above table shows a conductor size based on IEC 60947-1 Table 11 in ambient temperature 40°C
and open air. The above figure shows an examination circuit.
CAUTION
M12
45±5 N·m
Do not oil.
Circuit breaker
Conductor
terminal
(silver plated)
AED630-CV to AED1600-CV
85
7,700
15,100
21,400
Conductors (Copper bus bar)
Quantity (Note) Conductor size (mm)
40 × 5
2
2 60 × 5
2 80 × 5
2 100 × 5
CAUTION
25mm
Use plain washers to connect so that the
washers do not overlap with each other.
(N)
Conductor strip
Circuit
breaker
200 mm max.
Fixing support
3 m
Circuit
breaker
2 m
Plain
washer
Plain
washer
E-21