The electrical system in the commercial structures is a set of components, electromechanical and physical equipment, which allow the distribution and use of electrical energy.
For commercial structures we mean shops, warehouses, bars, exhibition areas, florists, hairdressing and beauty salons, bars, stores and similar, in particular they are open to the public.
The main standard to refer to for electrical installations in commercial structures is the CEI 64-8 standard, but it is not the only possible solution to obtain a system in a workmanlike manner, the installer will have to apply the necessary diligence and expertise in evaluating the particular circumstances of each plant.
Depending on the type and quantity of stored goods, it may be necessary to check whether the commercial structure is at greatest risk of fire: in this case it is necessary that the electrical system is designed by a professional registered in the professional register. The same, even if more rarely, is necessary in case of structures with danger of explosion.
In short, the design of the electrical system is necessary when:
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structure at greatest risk of fire
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the commercial area exceeds 200 square meters
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the engaged power is greater than 6kW
In other cases the project can be arranged by the technical manager of the installation company. Up to 6kW of power supply the supply is single-phase 230V as for residential buildings, above the supply becomes three-phase 400V .
In general, the electrical system in the commercial structures is as follows:
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delivery point with measuring group and overvoltage protection isolation system, located outside
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general framework that can be unique for centralized plants, or distribution board for more complex plants
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power and control circuits divided into the areas of greatest interest, for example interior lighting, external lighting, sockets, external or internal shop signboard, window lighting, automatic shutters and curtains, air conditioning
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stabilized circuit for critical or ICT users, such as loudspeakers, modems or ADSL connections, telephone outlets or dect repeaters, computers and network equipment in general
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anti-theft security circuit
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video surveillance security circuit
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access control circuits or driveways
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emergency lighting circuit
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rephasing plant if necessary
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network system for IT systems