What does laying cables mean

Baunetz_Knowledge

Details are in the DIN 18015-3Electrical systems in residential buildings - Part 3: Cable routing and arrangement of equipment set. It was re-published in September 2016 as a replacement for the 2007 edition and applies to the arrangement of invisible lines and cables as well as outlets, switches and sockets in electrical systems. It does not apply to visible surface-mounted installations. The revision contains, among other things, more precise definitions of ceilings and floor slabs as well as, for the first time, installation zones on the outside of buildings.

The following principles apply

  • Lay cables in walls only vertically or horizontally
  • a fixed installation is safer than a movable one
  • Lines outside the reach of people are safer

Common types of installation in the building are

  • on plaster
  • in and under plaster
  • in electrical installation pipes
  • in electrical installation ducts (skirting, parapet or underfloor floor ducts)
  • in structural cavities (ceilings, walls)
  • on cable trays or trays
  • directly in the masonry or in recesses in the concrete as a type of concealed installation
  • directly in the concrete (but not in vibrated or rammed concrete, here only in pipes)

Relocation is not permitted

  • on chimney chimneys (would result in a reduced service life of the insulation due to the heating)
  • in chimneys
  • in ventilation ducts
  • within metal profiles (penetrations through metal profiles are allowed with appropriate edge protection)

Keep enough distance from

  • warm pipes
  • Lightning protection systems (install surge arrester if necessary)
  • Telecommunication lines (if necessary provide separators in channels)

When laying in the ground, sheathed cables (e.g. NYM) must be protected with protective tubes or closed installation ducts. Only cables may be laid directly in the earth.

Comply with installation zones
Certain installation zones are stipulated within buildings for lines covered by plaster as well as for switches and sockets. Taking into account the regulation that lines are only to be laid vertically or horizontally, this ensures that the approximate course of the (invisible) lines can be traced. This reduces the risk that during subsequent assembly work by third-party trades (gas, water, heating), e.g. B. when drilling dowel holes or driving nails etc. the lines are damaged.

According to DIN 18015-3: 2016-09, the following preferred dimensions apply when laying cables inside buildings:

Horizontal installation zones with horizontal installation

  • ZW-u: Lower horizontal installation zone in the area 15 to 45 cm above the floor
  • ZW-m: Central horizontal installation zone in the area of ​​100 to 130 cm above the floor
  • Two: Upper horizontal installation zone in the area 15 to 45 cm under the ceiling cladding

Vertical installation zones for vertical installation

  • ZS-t: Vertical installation zones on doors in the area of ​​10 to 30 cm
  • ZS-f: Vertical installation zones on windows in the range 10 to 30 cm
  • ZS-e: Vertical installation zones on wall corners in the range 10 to 30 cm

Cable routing on the ceiling

  • ZD-r: Installation zone in the room with a width of max. 30 cm with a wall clearance of at least 20 cm
  • ZD-t: Installation zone in the doorway with a width of max. 30 cm with a wall clearance of at least 15 cm

Preferred heights for switches and sockets

  • in the middle area: 105 cm above the finished floor area (deviations are possible in kitchens and housework rooms)
  • in the lower range: 30 cm above the finished floor area

For sockets, switches or installation sockets that are located outside the installation zones, they must be supplied with a vertical stub line from the closest horizontal installation zone.

Installation zones on the outside of external walls
In order to avoid structural damage from electrical installations, the revised standard defines installation zones on the outside of external walls for the first time. The following installation zones have been defined:

Horizontal installation zones outside

  • AZW-o: Outer horizontal installation zone at the top in the area 20 to 40 cm below the inner ceiling
  • AZW-u: Outer horizontal installation zone at the bottom in the area 20 to 40 cm above the floor

Vertical installation zones outside

  • AZS-t: Outer vertical installation zone on doors in the area 10 to 30 cm next to them
  • Shell edges
  • AZS-f: Outer vertical installation zone on windows in the area 10 to 30 cm next to the building shell edges
  • AZS-w: Outer vertical installation zone on wall edges in the area of ​​50 to 70 cm next to the unfinished building edge

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