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C-BUS TRAINING MANUAL - VOL 1
16
4.3 Wiring a C-Bus Network
The C-Bus system is wired using Cat-5 UTP cable.
C-Bus Cat-5 UTP has a mains rated sheath (pink) and consists of four colour-coded twisted pairs.
The standard colours are:
• blue twisted with blue & white
• orange twisted with orange & white
• green twisted with green & white
• brown twisted with brown & white.
The conductors within a C-Bus cable are displayed in Figure 7.
Figure 7 – Conductors within a C-Bus cable
The electrical characteristics of Cat-5 UTP cable include low resistance and capacitance. The cable
also has high noise immunity (provided by the twist between the pairs), making it ideal for C-Bus
wiring.
Two conductors are used for each positive connection to a C-Bus unit and two for each negative
connection:
• a termination is more secure when made with two conductors
• the extra copper provided by the second conductor reduces the voltage drop on long
cable runs.
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