Common mistakes in building electrical work
1. Using self-extinguishing pipes instead of non-self-extinguishing pipes (known as fireproof).
2. Failure to observe the color of the neutral (blue) and earth wires (green and yellow striped).
3. Failure to observe the height of the sockets (at least 60 cm for washing machines with a distance of 30 cm from the water outlet).
4. Residential sockets must have a safety cap or child-proof curtain, as hundreds of sockets have been installed without protection.
5. The cable is not installed and the extension wires are wound and crushed under the terminal screw (or instead of the cable, the extension wires are soldered together).
6. The minimum distance of 120 cm from the light to the shower is not observed.
7. Wire is used instead of cable between the meter and the unit’s electrical panel, which is likely to damage the wires and break the strands on long routes.
8. Not using the neutral terminal bus and the earth terminal bus.
9. The ratio of the pipe diameter to the bundle of wires and cables
1.3 (one point three tenths) was not observed.
10. The wiring was done before the finishing and plastering was completed.
11. Ordinary wire (instead of fire-resistant cable) was used for the fire alarm system.
12. For warehouses (in buildings of 5 floors and more), the fire alarm piping was not done and the finishing and plastering was completed.
13. The outlet in the yard and roof does not have dust and water penetration protection (IP).
14. The neutral and earth wires must be pulled together with the phase inside the lighting pipes, which in many cases, the neutral wire is mistakenly pulled separately from the phase wire towards the lighting branches.
15. The earth wire is mistakenly not pulled for lighting.
16. They mistakenly take the neutral and ground wire cross-sections as half-phase.
17. Use of substandard, self-igniting, and non-standard hose pipe.
18. Failure to implement the main connection of the ground system with the building structure.
19. The elevator cable is incorrectly used as four strands (without protective conductors)
20. No detector is provided for the elevator engine room and later a branch is inevitably taken from an unrelated zone.
21. The package socket is installed in an inappropriate location (do not install it under the package, as there is a possibility of water leakage and electric shock.)
22. An inappropriate wire or pipe is used to power the so-called halogen spot lights (the wire must be at least one and a half square millimeters).
23. According to topic three, at least one fire alarm must be installed on each floor, and at least two alarm circuits must be implemented, so that in case of a possible disconnection of one, the other remains.
At least one fire alarm button must be installed for each floor, which is not installed.
24. The pipes in the open space (roof and yard) are made of PVC, which dries and becomes brittle under sunlight (replace it with a grounded steel pipe).
25. At least four sockets are required in a three-by-four bedroom, but a maximum of one or two sockets are installed by mistake.
26. The work is done without an executive plan.
27. The central antenna cables are not addressed and the antenna end sockets are used instead of the antenna middle socket. Also, the circuits or miniature switches of the electrical panels are not addressed.
28. The phase wire is connected to the left hole of the socket (the phase must be connected to the right hole).
29. A diagonal pipe in the wall is not allowed.
30. A three-pole or four-pole (multi-pole) isolator switch is not installed for the water cooler on the roof, and as a result, it creates a risk of electric shock during service.
Topic thirteen mentioned that competent performers with a valid professional license to work in electrical installations must be employed to install electrical installations.
Unfortunately, we see that the contractor or coordinating supervisor is late in coordinating with the electrical supervisor for the inspection, and when the electrical supervisor visits, he is faced with a world of problems and errors that cannot be repaired or replaced, or that are very expensive to fix.