Manual for electrical installation on plasterboard walls.
How to outline the plant
1. Inside the metal structure that makes up the plasterboard wall, at the back of the slab, trace the lines that indicate the passage of corrugated pipes with a construction pencil. (N.B: in case of adhered wall the traces will be made on the wall with a special marker).
2. On the newly designed lines, place some block-pipe rings that will serve, together with the clamps, to fix the "corrugated" mapping the project.
3. During the mapping phase it will be established also where the holes will be made on the plate for the subsequent assembly of the electrical boxes (boring with a circular saw with diameter 63) and for the assembly of junction boxes (drill with a plasterboard saw).
Fixing of corrugated pipes
1. Pass the corrugated tubes through the previously installed tube retainer rings and secure them with the clamps.
2. Near the exit points established on the project for positioning the electric boxes, cut the pipes with scissors. This operation will facilitate, later, the assembly of the plant. (N.B: it is suggested to abound with the length of cables and pipes so as to avoid having to roll out the whole again or create dangerous junctions during processing).
Creating exit points
1. First of all, the plasterboard sheets will be fastened with 3,5x25 black nailed phosphated self-tapping screws, on the aluminum structure to close the created wall (or counter-wall).
2. Using the previously designed project-map, the access points for the insertion of the electrical boxes will be identified by indicating them with a pencil on the plate.
3. On the points just marked, mill the slab with a 63 mm hole saw or, in the case of junction boxes, with a simple saw for plasterboard.
4. Now remove the previously cut tubes in abundance from inside the wall to the outside.
5. At the end of this operation we should have about 10/15 cm of corrugated pipes projecting from the wall.
Assembly of electrical boxes
1. Pass the pipes out of the wall, inside the electrical box.
2. Now insert the electric box into the wall-mounted recess and if the length of the cables is correct, there should be about 10/12 cm of protruding cables in order to work comfortably and at the same time avoid waste by making patches or last-minute additions .
3. Screw the steel fins on the small electric box with a screwdriver with depth adjustment, making sure that the same go to fix to the plasterboard. N.B: not all the electric boxes on the market have screwable steel fins and therefore it is advisable to pay attention during the purchase.
Finishing of electrical boxes
During the phase described above, it may be necessary to reinforce the points around the sump with polyurethane foam before inserting the electric box. This operation has mainly two functions: the first is to improve the strength of the steel mordents of the boxes on the slab and the second is to strengthen the rigidity and mechanical strength of the plasterboard in an area that could be critical due to the hole created for entry of electrical supports.
Passage of electric wires
1. Once the previous point has been completed with the creation of the holes and the subsequent assembly of the electrical boxes, the work is essentially finished.
2. Having created a new electrical system, it will be necessary to run the electric cables inside the corrugated pipes and then proceed with the wiring connecting the fixtures to the conductors cutting the electric cables at the right length (NB: do not leave wires protruding outside of the closing terminals).
3. It will be important to also evaluate the insertion of a new control unit that can host a multiple circuit breaker and which has more exit points, compatible with the needs of the new system.
Completion of the work
1. We will now proceed with the final touch-ups by mounting sockets and switches in the boxes, checking their stability.
2. Stucco and repair the damaged parts of the plate during the box fixing operations.
3. Complete the work by painting the wall evenly.
Suggestions:
Intervening on the electrical system turns out to be complex and articulated both because it consists of several elements, and because it is a "potentially" dangerous work.
Against this, the rules that regulate the creation and installation are strict and safety-conscious.
It is therefore recommended to renounce the do-it-yourself for this type of intervention.
The plant must be made only by companies registered with the Chamber of Commerce who will then issue the "Declaration of conformity of the work performed" that will certify that the circuit is up to standard.
To regulate the construction of electrical systems are the rules:
⁃ Cei 64-8 (Italian Electrotechnical Committee) - entered into force on 1 March 1993 - and variant V3 to the standard itself, which came into force in September 2011.
⁃ Decree of the Ministry of Economic Development n. 37 of 22 January 2008 (published in the Official Gazette No. 61 of 12-3-2008), which replaced the law 46/1990.
In case you still want to proceed with the construction of the plant in a private way, below you will find basic tips:
1. Use materials in accordance with:
- pipes and cables of a given thickness based on the electric current that passes through them;
- sockets and circuit-breakers approved and above all insulating and fire-retardant.
2. Before performing any type of work, disconnect the power supply of the house.
3. Once the installation work has been completed, before completing the closing of the plasterboard wall, it is suggested to have all of this checked by an expert in plant engineering and / or qualified personnel.
Tools and materials:
- High quality corrugated cardboard
- 4x4 tarpaulin
- Metro (flexometer or folding wooden meter)
- Construction pencil
- Marker for wall tracks
- Cable cutting scissors
- Cordless drill with depth adjustment
- Professional cutter
- Saw for plasterboard
- 63 mm diameter cup milling cutter
- SDS drill bit 6x110
-Ladder
- Steel or plastic pipe rings
- Steel or plastic pipe clamps.
- Corrugated pipes for passing electrical wires
- 3.5x25 black phosphated self-drilling screws
- "Upright" profiles in aluminum
- Plasterboard sheets
-Polyurethane foam
- Stucco
-Water
- Nylon expansion plugs with diameter 6.
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