Apcm1, Apcm2 And Apcr Cubicles; Current Transformer Connection; Figure 3.4. Power Cables Connection To The Incoming Power Terminals For Boxes; Figure 3.5. Power Cables Connection To The Incoming Power Terminals For Cubicles - ABB APC Series Installation, Operation And Maintenance Instructions

Figure 3.4. Power cables connection to the incoming power terminals for boxes

3.4.3.2.

APCM1, APCM2 and APCR cubicles

The APCM and APCR cubicles are available in bottom or top cable entry. By default, the bottom cable entry
is applied.
The plate at the bottom left of the cubicle is provided to allow cable entry (see Figure 3.1.) In case of top
cable entry, use the two other plates at the top of the cubicle.
Run the power cable through a gland of a suitable diameter in order to keep the protection level of the
cubicle.
APCM1
(bottom cable entry on the picture)

Figure 3.5. Power cables connection to the incoming power terminals for cubicles

3.4.4.

Current transformer connection

Current transformers of Class 1 accuracy and appropriate burden with secondary current 5A will normally be
used. In case CT and the automatic capacitors are close to each other a 5VA burden is sufficient if no other
loads are connected to the CT.
The current transformer must be sited in a position to monitor the total load (i.e. inductive load and
capacitive load). This will normally be close to the incoming supply metering position. A range of ring and
split core CTs exists on the market to ease installation.
Current transformers are normally marked P1/P2 and S1/S2 and should be positioned so that P1 faces
the incoming supply while P2 faces the load side.
Control wires from S1 terminal go to terminal marked
l
terminal marked on the diagram. Once the connection is made, the shorting link (gray jumper)
must be removed for proper operation.
To easy guide control wires, a cable profile is fixed in each box.
Each cubicle has several base supports on its central frame to receive cable ties.
APC - Chapter 3. Installation
APCL1
APCM2
(bottom cable entry on the picture)
APCL2
APCR
(top or bottom cable entry)
k
on the circuit diagram and from S2 to
15