Recommended 24V Power Cable; 24V Power Supply Connection - Distech Controls ECL/ECB-PTU Series User Manual

Maintain consistent polarity when connecting controllers and devices to the transformer. That
is, the 24V COM terminal of each controller and each peripheral
same terminal on the secondary side of the transformer. This transformer terminal must be
connected to the building's ground.

Recommended 24V Power Cable

The table below lists Distech Controls' recommended power cable.
Table 14: Distech Controls Recommended 24V Power Cable
Cable Type Non-Plenum Applications (FT4)
AWG - Number
of Conductors Part Number
18-2 CB-W181P-1002
16-2 CB-W161P-1031
14-2 CB-W141P-1081

24V Power Supply Connection

Use an external fuse on the 24VAC side (secondary side) of the transformer or DC power sup-
ply, as shown in
For any given number of devices, wire the power supply as shown in
Maintain consistent polarity when connecting controllers and devices to the transformer. That
is, the 24V COM terminal of each controller and each peripheral should be connected to the
same terminal on the secondary side of the transformer.
Connecting the power source to Electrical System Ground is not a requirement for
proper system operation. However it is good installation practice to do so in order to
maintain the same potential between all controllers and Protective Earth.
Figure 38: Power wiring – 24VAC: Maintain Consistent Polarity with all Controllers' Power Connections
Controller 1
24V AC/DC
24V COM
Controller 2
24V AC/DC
24V COM
64
O.D. (Ø)
5.0mm 0.20in.
4.8mm / 0.19in.
7.2mm / 0.29in.
Figure 38 and Figure 39, to protect all controllers against power line spikes.
Fuse: 4 A Max .
Fast Acting
24 VAC AC
Transformer
OPTIONAL : Connect to Electrical System
Ground - At Power Supply Only
may be connected to the
Plenum Applications (FT6)
Part Number O.D. (Ø)
CB-W181P-2051 5.0mm 0.20in.
CB-W161P-2062 4.8mm / 0.19in.
CB-W141P-2013 7.2mm / 0.29in.
Figure 38 and Figure 39.
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