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6.7.2 DC Cable Connection
Proceed as follows to connect the DC cables:
Step 1
Make sure the switch upstream of the combiner box is in the OFF position.
Step 2
Strip off the insulation cover of the cable with a tripped length of 5mm longer than the
depth of the cable lug.
Step 3
Crimp the cable lug. It is advisable to select DT-95 cable lug.
Put the stripped cable inside the cable lug;
Tighten the cable lug with relevant tools. The crimping number should be more than two.
Step 4
Insert the heat-shrinkable tubing;
A tubing with length 2cm longer than the depth of the cable lug is recommended;
Insert the heat-shrinkable tubing into the cable lug;
Shrink the tubing with hot air blower.
NOTE:
Cable protectors are advisable in the cable crosses if the multi-core cables are
used.
Step 5
Connect the cable;
Select bolts matching with the cable lug, recommend: M10;
Attach the cable lug to the DC connection copper bar following the sequence in the following
figure;
Fasten the bolts with screwdriver or spanner with torque of 25N.m.
WARNING:
Incorrect connection sequence may cause fire. Please pay maximum attention to
the connection sequence.
Ensure the firmness of the cable connection. Poor connection or oxidation of the
surface may cause over-heating or fire.
NOTICE:
Long bolts may affect the insulation and may cause short circuit.
Remove the heat-shrinkable tubing between the cable lug and the copper bar if
necessary. Poor contact or over-heating may follow if otherwise.
Step 6
Confirm that all cable connections are secure.
(a) Dimensions of holes on DC copper bar (mm)
