Connection - Mitsubishi Electric C Series Handling And Maintenance

Prevent the ingress of
water into the enclosure.
See to it so that rain water isn't
allowed to enter into the board
along the wires, for example.

3.6.3 Connection

• At the time of wire connection, tighten the terminals screws with the tightening torque shown
in Appendix 4.
Otherwise, fire can result.
• Loose fastening leads to overheat and can cause malfunction.
• Excessive fastening injures the screws and breaks the moulded case.
• Use a screwdriver suitable for screw shape.
Oil is prohibitive
to threads
Oiling lowers frictions lead-
ing to loose screw. Over
tightening causes breakage
of the screw.
Fix the conductors firmly keeping the poles parallel with
each other
Attach the connecting conductors so that the poles are kept
parallel with each other.
Fix (bundle) the connecting conductors firmly as significant
magnetic force is generated according to magnitude of fault
current.
21
Never use thinner, detergent, and
other chemicals for cleaning.
It is likely to make letters on the
plate illegible or to lower insu-
lation performance.
Clean the breaker using air
cleaner or by brushing.
Don't deform the
studs
When insulation distance isn't enough, or for
the live and exposed part of the terminal to
prevent short-circuit or ground fault due to
metal piece dropping, applying insulation by
Fasten the conductors of
taping, insulation tube, and insulation barrier.
rear connection type with-
Of 400V and higher systems, in particular, un-
covered conducting part is dangerous.
out deforming the stud
Note. The model that a standard packs insu-
Insulation
support
Do not adhere gum tape
on the name plate.
The name plate may come off.
CAUTION
Insulate the live Use the terminal screws
and exposed part packed together.
Taping or
insulation tube
Long terminal screw makes
insulation distance insuffi-
cient, while short terminal
Insulation
barrier
screw causes insufficient
tightening force, which
leads to overheat.
lation barrier together is to install insu-
lation barrier.
Magnetic force per 1 meter of conductor
(In the case of 3-phase short circuit) N
Conductor distance cm
Let-through
current r.m.s.kA (pf)
10 (0.4)
18 (0.3)
25 (0.2)
35 (0.2)
42 (0.2)
50 (0.2)
65 (0.2)
85 (0.2)
100 (0.2)
125 (0.2)
Avoid strong electro
magnetic field.
When a transceiver is used, keep
it off at least 1 meter from installed
places of the earth leakage circuit
breakers and circuit breakers with
electronic over-current release.
Use ring-type terminals
of suitable size.
Where a large number of
solderless terminals are
used for connection, con-
nect them referring to Ap-
pendix 4.
10 20
500 250
1900 950
4500 2250
8900 4450
12800 6400
18200 9100
30800 15400
52600 26300
73000 36500
114000 57000