How do I track wires behind drywall

Lay cable

 

Certain simple activities in electrical installation can be carried out by the experienced do-it-yourselfer without any problems. These activities include chiseling slots, setting flush-mounted sockets, laying pipes and cables, pulling cables into pipes. However, there are a few basics to consider.

Basically, it is important to use the correct installation cables when laying lines and cables. A list of the most important installation cables for house installation can be found on this page. Furthermore, many low-voltage lines, which are mainly laid flush in conduits, are important. You can read here which cables are suitable for which connections.

As already mentioned, it is important to use the correct cables for the planned connections. But it is also very important to pay attention to certain regulations and principles for electrical installation. These include, for example:

  • Installation zones
  • Classification of the circuits
  • IP protection classes
  • Laying in concrete ceilings
  • Laying outdoors
  • Definition of distributor and sub-distributor
  • Setting of flush-mounted boxes and cavity wall boxes
  • Installation in drywall and wooden stud walls
  • Connect (clamp) cables in sockets (distributors)
  • and much more

Laying cables - two possible designs

In massive shell construction - flush-mounted installation - there are two design options (only basic installation without low-voltage current, as this should generally be carried out completely with empty conduits).

1. The complete installation is carried out with flexible UP conduits, into which the individual wires (PVC core lines) are later drawn.

Advantages:

  • The circuits can be changed at any time
  • The circuits can be expanded later without great effort
  • lower material costs

 

Disadvantage:

  • Wider wall slots must be made
  • Much more time spent on installation and therefore more labor costs

 

2. The complete (basic) installation is carried out with cable NYM-J (empty pipes from the concrete ceiling are cut off flush with the ceiling)

Advantages:

  • Only narrow slots need to be made
  • Installation (laying cables) is usually very quick

 

Disadvantage:

  • The installations can later only be expanded or changed with great effort and possibly with chiselling work

In both versions, the pipes, lines and cables are laid in wall slots.

 

Important:

  1. The slots should be milled and, depending on the wall thickness, not too deep

  2. Wall slots for electrical lines must not be chiseled on chimneys. It is also strongly advised not to lay cables on chimneys (heat generation reduces the service life of the cable insulation)

  3. Wall slots must not impair the stability of the wall

  4. Large wall slots (e.g. in the main distribution) can weaken the statics of the building

  5. Always lay cables in ceilings or on floors with suitable clamps or mounting brackets (fixed installation). Avoid moving the layout

  6. When laying the cables and lines, make sure that they are protected from mechanical damage. Either through a secure fixed installation or through cladding (pipes)

offer
Kopp 150850849 NYM-J 3 x 1.5 mm² damp room cable, 50 m ring *
  • Sheath (damp room) cable NYM-J 3G1.5 mm², 3-core
  • 50 m ring, gray
  • 3 cores with a nominal cross-section of 1.5 mm² each, outer diameter of the installation cable approx. 8 mm
  • Can be used for fixed laying / installation in dry and damp environments as well as for use in or under plaster and in concrete (with cable hose). Not suitable for use in the ground!
  • 300V nominal voltage (U0) between conductor and metal covering, 500V nominal voltage (U) between outer conductors with three-phase current, max.permissible conductor temperature 70 ° C

You can find more information about the currentness of the displayed prices here.

Cables that are laid flush, as well as for switches and sockets, apply certain installation zones. Basically lines are only laid vertically and horizontally. Exceptions are ceilings and in the floor, here cables can also be laid on the shortest route. When laying in the ground or on the unfinished floor (under the screed), NYM-J sheathed cables must also be protected with protective tubes.

Other ways of laying cables are:

  • On the wall
  • In and under plaster
  • In electrical cable ducts
  • In cavity walls (drywall made of plasterboard or wood)
  • In installation pipes suitable for electrical installation
  • On cable trays
  • In the ground (with protective tube)
  • In concrete (with protective pipe)

 

When laying the lines and pipes concealed (concealed), it is essential to adhere to the installation zones in accordance with DIN 18015.

Lines laid horizontally should run 30 cm or 15 cm above the finished floor or 30 cm below the finished ceiling surface. Vertically laid cables should run 15 cm next to the edges or corners of the shell.

Sockets, switches or junction boxes that are outside these areas should be supplied with a vertical stub line from the closest horizontal installation zone.

Separate regulations also apply in kitchens and domestic work rooms. Separate stipulations also apply in the bathroom.


 

Installation zones (laying of cables) living space:

Image source: Wikipedia

 

 

 

Important: When making wall slots, pay attention to the depth of the slot, it should be a maximum of 2 cm for thin walls of 11.5 cm, a maximum of 3 cm for walls with 17.5 cm, and a 4 cm slot for walls with 24 cm. for walls with 36 cm max. 6 cm slot depth.

Before you start laying the cables in the building shell, you should have placed all the flush-mounted sockets in the masonry. You can read here how to do this yourself.

The sequence of the individual work steps for flush-mounted installation can be found here.

 

offer
Kopp 150850849 NYM-J 3 x 1.5 mm² damp room cable, 50 m ring *
  • Sheath (damp room) cable NYM-J 3G1.5 mm², 3-core
  • 50 m ring, gray
  • 3 cores with a nominal cross-section of 1.5 mm² each, outer diameter of the installation cable approx. 8 mm
  • Can be used for fixed laying / installation in dry and damp environments as well as for use in or under plaster and in concrete (with cable hose). Not suitable for use in the ground!
  • 300V nominal voltage (U0) between conductor and metal covering, 500V nominal voltage (U) between outer conductors with three-phase current, max.permissible conductor temperature 70 ° C

You can find more information about the currentness of the displayed prices here

 

 

Filed Under: TOP Articles, BasicsTagged With: Laying cables, laying lines, flush-mounted installation, installation zones