SMA MC-Box 6.3 - Manual (Page 24)

6 Electrical Connection SMA Solar Technology AG
24 MC-BOX-6_12-BE-en-20 Operating Manual
6.2 Preparing the Cables
Cable requirement:
☐ Conductor material: copper
Procedure:
1. Select a suitable membrane for inserting the individual connection cable.
2. Pierce the selected membrane with a pointed object. The opening must not be too large.
3. Insert the connection cable through the membrane in the Multicluster Box. The connection cable
must be tightly enclosed by the membrane after it is inserted.
4. Strip the insulation off the connection cable in accordance with the tube terminal lug used.
5. Fit the stripped insulated conductor with a suitable tube terminal lug. This does not apply to the
connection cables of the Sunny Island inverters.
6. Connect each connection cable as described in the following sections.
6.3 Cable Connection
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Damage to the Multicluster Box due to moisture penetration
Dust and moisture can penetrate the Multicluster Box due to overstretched rubber membranes.
• When inserting the connection cables, take the maximum diameter of the rubber membranes
into account (see Section 6.1.2, page 21and Section 6.1.4, page 23).
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Damage to the Multicluster Box due to rupture of the grounding cables
If the mechanical stress on the connection cables is too high, the connection cables get loose and
damage the Multicluster Box.
• Secure the connection cables of the Multicluster Box 6.3 externally, e.g. by means of cable
support rails.
• Secure the connection cables in the Multicluster Box 12.3 in the provided cable support rail.
Use the strain reliefs and counter-troughs provided for that purpose.
Overview of the connection area
The following sections show an example of the connection area of the Multicluster Box 12.3.
The connection procedure for both Multicluster Boxes is identical, only the environment is
different.
Torque of the terminals
When connecting the cables, it is essential to observe the torques of the individual terminals
(see Section 11, page 38or Section 12, page 42).