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C-BUS TRAINING MANUAL - VOL 1

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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