Built-in gas boiler. Design electricians
We have carried out a comprehensive design of an integrated gas boiler for an administrative turnkey two-story building. Developed sections GSV, TM, EOM, AK, VK, OB, outdoor gas supply.
In this article, I propose to familiarize yourself with the section of the project of internal power supply and lighting.
DESIGNING OF ELECTRIC GAS BOILER
Electrotechnical part of the project
General directions.
The power supply of the boiler room to perform from the existing IGU of the building.
Grounding system TN-C-S.
According to the reliability of the power supply, the object is related to loads of category II according to PUE
As an input-distribution device, provide an SR cabinet, type ЩРн-12з-0 74 У2, IP54 protection level with circuit breakers providing protection of circuits against overloads, short-circuit currents and protection against earth leakage currents. Electricity metering centralized at IGU of the building. The main and distribution networks are made of cable VVGng (A) -LS, laid openly on the walls with brackets. All single-phase group lines should be made three-wire; in this case, on SR, zero working conductors should be connected to the zero operating bus N, and the neutral protective conductors - to the PE protective ground bus. Cable passes through walls are made in pipe sections.
Consumers of electricity are technological and lighting equipment.
The project provides for working and maintenance lighting for 12V. For repair lighting, a step-down separation transformer-transistor YaTP-0.25-220 / 12V was adopted. For emergency lighting laid FOS3-5 / 6 lamp with a sealed battery.
In the boiler room, install the LED lamp DPO 3030, control the switch in place, power up with cable VVGng (A) -LS 3x1.5 - open along the walls on the brackets. According to SNiP II-35-76, a separate group line must be provided for the class B1-a room, an NSP57M-01D 16P LED luminaire is installed, and a switch outside the boiler room.
To ensure the safety of people, the working documentation provides all types of protection required by GOST R 50571.1-2009 for electrical installations of buildings. Protection against direct contact is provided by the use of cables with appropriate insulation and sheaths of electrical equipment and apparatus with a degree of protection not lower than IP20. Protection against indirect contact is made by automatically disconnecting the damaged part of the network with overcurrent protection devices in combination with the TN-C-S grounding system.
In multi-conductor cables that do not have the appropriate PUE color of the cores, when mounted at the ends of the lines (at the connection points) over the entire diameter of the core insulation, color labels should be at least 5 cm in the following colors: for the zero operating conductor - blue; for the protective conductor - a two-color combination of longitudinal strips of green and yellow.
As the main grounding bus - building bus PE PE.
At the entrance to the building, re-ground the protective conductor. Run the main potential equalization system - to do this, connect it to the main grounding bus of the VRU:
• protective conductor (PEN-conductor) of the supply line;
• grounding conductor;
• all pipelines and air ducts;
• internal ground loop of the boiler room;
• lightning protection;
• met. chimney steel strip 40x5mm.
Lightning protection
In accordance with CO153-34.21.122-2003, for building lightning shields, the building belongs to ordinary objects with a level of protection II and has reliability of protection against direct lightning strikes 0.95.
External lightning protection system.
Met is provided as a lightning trap. chimney, on the roof - lightning-receiving grid with a cell pitch of at least 10x10 m. The lightning-receiving grid is made of galvanized steel wire f8 mm (section 50 mm), laid on the roof. Current leads are located around the perimeter of the building, the distance between them is not more than 20m.
The earthing switch is made in the form of an external contour from a steel strip 40x5mm, laid at a depth of 0.5 m from the ground and at a distance of at least 1.0 m from the walls. Grounding electrodes 50x50x5 mm of steel with a length of 3 m are located at a depth of 0.5 m from the ground.
Connect the earths of the grounding device by welding or bolting. The joints below the ground level should be protected from corrosion (plate anti-corrosion bandage).
To protect the building from the secondary manifestations of lightning and equalize the potential, metal pipes, fences and antennas should be connected to the air terminal.
The outlets on the building wall should be painted with paint Tikkurila Ral 1015 and Ral 8028 twice. Tikkurila Temacoat RM 40 TVH paint 14,4 l Ral 1015 and Ral 8028 - two-component, resin modified epoxy paint.
All electrical work to perform in accordance with the EMP.
PROJECTION REGIONS
Our company designs heating for facilities throughout Russia, but the best prices will be in Moscow, Moscow Region, St. Petersburg, Orel, Tula, Kaluga, Ryazan, Vladimir, Tver, Yaroslavl, Rzhev.