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Laying and connecting underground cables - installation depth & costs
If the garden is to be used on warm summer evenings, it needs light. Maybe the pond needs a pump or the garden kitchen a socket.
When is it worthwhile laying an underground cable, and which alternatives are conceivable? Or would you like to know how you can save on electricity at the construction site?
Light in the garden
When it comes only to bringing light into the garden, and you shy away from the laying work, Niedervolttechnik is the solution. Here is a transformer housed in the house, then go from the only weak current leading cables in the garden. There is little danger from the electric current, so the cable can be laid underground in a canal. You just have to make sure that not every cut of the spike immediately damages the cable.
Lay underground cable
If electricity is required in the garden kitchen or garden shed, a real underground cable must already be made. You should not simply lay such an underground cable wildly, but there are some precautions to be taken: The connections to the fuse box may only be made by a company or electrician licensed by the electricity supplier.
Lines for outdoor use must be separately secured by him, so be provided with its own backup. In addition, a residual current circuit breaker must be installed for the outside line.
Formerly known as FI-switch, this protection is called today RCD (English: Residual Current Device), which could be translated as residual current protective device.
In the garden, however, you may dig and lay the cable yourself. This must also be done correctly, in the earth you may only lay approved cables. These have special names:
- NYY-J is a plastic cable with insulation and protective cover made of PVC,
- NYCWY refers to a PVC-insulated underground cable with copper wires and copper conductors,
- NAYY is a ground cable with aluminum conductor.
Which cable is advantageous for which purposes, your electrician can tell you. Which cross section you need depends on the strength of the fuse to which the cable hangs. That depends on which customers should draw electricity later. Again, the electrician will be able to advise you.
- This cable must be at least 60 centimeters deep
be laid (under lanes 80 centimeters, but through your property will probably rarely lead a road).
- To other power lines (this also includes communication lines) must be maintained at least a distance of 30 centimeters.
- Once the trench is dug, check that it is free of stones that could later damage the cable.
- Then a sand bed of about 10 centimeters comes into the ditch.
- Finally, the cable.
You can choose to route the cable into a conduit or to use cable covers made of clay or PVC. If you need to connect the cable, you must use special water-protected connectors. In no case rich simple couplings that are protected against splashing or not at all. After the installation, another 10 centimeters of sand is applied, then a warning tape made of yellow PVC with the inscription "Erdkabel" or a red and white construction site warning tape comes over it.
The fact that the connection to the fuse box can only be made by the licensed electrician has already been emphasized above. Of course, whether or not you can make other connections at the end of the cable (such as a garden socket) depends first of all on your electrical ability. If you are not a specialist, it is always advisable to have a connection with the electrician. Electricity can ultimately cost lives. When it comes to high current (three-phase current) as when connecting a sauna stove, this warning can only be emphasized twice.
If you want to save money on powering your new home, you can too
lay the ground cable, which is the main connection of the house, yourself. This saves you money, but not everything that was listed in the supply company's list of costs for cable entry. Also for the conduction path is usually a flat rate to pay, even if you dig yourself still a few hundred euros.
Earth cable - costs
The cable itself causes costs in the single-digit euro range per meter, the thinnest to 1, - Euro, the thicker the more expensive. The connection by the electrician costs depending on the effort, at about 100, - Euro it starts. Garden sockets are available from about 40, - € in the offer, the more comfortable and the more beautiful in the design they are, the higher the cost.