Siemens S5-135U/155U appendix Installation Guidelines

Installation Guidelines

Routing of Cables Outside Buildings

Lightning

Protection

!

Equipotential

Bonding

Legend for the table

ÀLines can be laid in common bundles or cable ducts.

￿Lines must be laid in separate bundles or cable ducts (without minimum clearance).

￿Lines within cabinets must be laid in separate bundles or cable ducts; outside the cabinets but within buildings, they must be laid

over separate cable routes with a clearance of at least 10 cm.

￿Lines must be laid in separate bundles or cable ducts with a clearance of at least 50 cm.

Outside buildings, lay the lines on metal cable trays if possible. Provide the joints between cable trays with an electrical connection and ground the cable trays.

When laying lines outside buildings, you must observe the valid lightning protection and grounding measures. The following applies in general:

Caution

Where cables and lines for SIMATIC S5 controllers are to be laid outside buildings, you must apply measures for internal and external lightning protection.

Outside the buildings, lay your lines either

Sin metal conduit grounded at both ends, or

Sin concreted cable ducts with continuously connected reinforcement.

Protect the signal lines from overvoltages by means of

Svaristors or

Sinert gas-filled surge diverters.

Fit these protective devices at the cable entry into the building.

Note

Lightning protection measures always require an individual assessment of the entire installation. For clarification, please consult your Siemens regional office or a company specializing in lightning protection.

Ensure adequate equipotential bonding between the connected equipment (see Section 3.3.2).

System Manual	3-13
C79000-G8576-C199-06