Cabling - Pilz PSS Series Installation Manual

• The housing should be connected to the earth conductor "PE". A cable
cross section of at least 2.5 mm
be kept as short as possible.
• Always connect the earth conductor "PE" to the central earth point in star
form.
• The 0 V connections on all the 24 V power supplies should be connected
and the 0 V mains earthed at a single point. The connection of the 0 V
supply to the central earth bar or earth fault monitor must be in
accordance with the relevant national regulations (such as EN 60 204,
VDE 0113, NFPA 79-1991:17-7, NEC: Article 250, for example).
• Connections should be protected from corrosion.
• Flexible earthing straps should be used on moving earth parts (e.g.
machine parts, gates). Ensure these earthing straps are as short and
wide as possible.

Cabling

It is possible to differentiate between cables according to their function.
The following groups exist:
• Group 1: Data and supply lines for DC voltages below 60 V and AC
voltages below 25 V
• Group 2: Data and supply lines for DC voltages from 60 V to 400 V and
AC voltages from 25 V to 400 V
• Group 3: Supply lines above 400 V
Cabling inside buildings:
• The cable groups listed above should be laid separately.
• Cables of the same group can be laid within the same cable duct.
• Lines from group 1 and group 2 should be laid in separate groups or in
cable ducts which are at least 10 cm apart.
• Lines from group 1 and group 3 should be laid in separate groups or in
cable ducts which are at least 50 cm apart.
Installation Manual: PSS 3056 Series
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2
should be used. Connections should
3-3