Carrier 33ZCVAVTRM Specifications download pdf (Page 210)

When connecting the CCN Communication Bus to a system element,

each of the three conductors must be used for the same signal type

throughout the entire CCN. That is:

 signal (+) terminals must always be wired to signal (+)

 signal ground terminals must always be wired to signal ground

 signal (-) terminals must always be wired to signal (-)

To achieve this consistancy, the following color code system is recom-

mended:

Signal Type Conductor Insulation Color/Pin #

+ Red (1)

Ground White (2)

- Black (3)

If a cable with a different color scheme is selected for the CCN Commu-

nication Bus, a similar color code system should be adopted to simplify

installation and checkout.

At each system element, the shields of its communication bus cables must

be tied together. If the CCN Communication Bus is entirely within one

building, the resulting continuous shield must be connected to ground at

only one single point (refer to Figure 7). If the CCN Communication Bus

exits from one building and enters another, its shields must also be

connected to ground at a lightning suppressor in each building.

The specific shield connections are illustrated on the following pages in

the wiring description for each system element type.

Grounding of Bus

Shields

1 2 ... 205 206 207 208 209 210 211 212 213 214 215 ... 315 316

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Carrier 33ZCVAVTRM Specifications Page 210