Guidelines for Parallel Cabling

The following guidelines should be observed for parallel cabling with signals of different classes:

• Unshielded cables with signals from different classes should only be installed over the shortest distance possible.

• Parallel cabling of unshielded cables with signals from different classes should be installed with the largest possible working clearance.

• Shielded cables should be used if cables with different signal classes are to be installed in parallel over distances of more than 30 m, or if the working clearance can not be guaranteed.

Recommended working clearances

The following illustration shows the recommended working distances between shielded cables with signals from different classes for parallel installation up to 30 m. The longer the distance for the parallel cabling, the greater the working distance to be selected.

Guidelines for crossing cables

Cables that carry different class signals must cross at right angles.