All buildings will need electricity in order to operate equipment and lighting, and the installation of the electric system in usually performed while the building is still under construction. This gives the electrician a good opportunity to do the wiring before the building is completed so that the wiring can be hidden in the walls or floors which are still to be finished. Electrical inspections are required for compliance purposes, and only a qualified electrician can be used to install an electric system in any building. Constructions without electrical compliance certificates are considered unsafe for humans and are not allowed to be used or occupied until a compliance certificate has been obtained after prescribed changes have been made.
While the building was planned and the plans were drawn up, normally an electrician will be contacted to design an electrical system for that building. The design of an electrical system can be easy or complicated, and a suitable electrical design draughtsman is required to perform an effective design. Multiple documents must be provided, such as the electrical specification documents and the electrical system layout plans and maps which specify what the system is supposed to do, and how it is connected. It must also indicate where all the systems and subsystems are.
Once the electrician has arrived on site they start to lay the wiring and connections to the power sources. There are a lot of factors to take into consideration here. These include:
- Safety: The appropriate safety clothing and electrical gear have to be used while performing any electrical construction. All wires must be earthed and adequate safety measures in terms of the current must be taken. Safety is not also important on-site, but also in the construction of the electrical system and the long term use of this system. The wiring must be laid in such a way to make it invisible and safe for the occupants of the building.
- Voltage issues: The equipment such as switchgear and wiring must be installed according to the voltage required in the building. Protection against overflow must be built-in and trip switches installed to cut the power supply once something goes wrong with the circuit.
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