GB 55024:2022 General code for building electricity and intelligence
1 General
1.0.1 This code is formulated in accordance with relevant laws and regulations to ensure physical health, life and property safety, national security and ecological environment safety and meet the basic needs of economic and social management during the construction of building electricity and intelligent system.
1.0.2 Electricity and intelligent systems of industrial and civil buildings and municipals with the power supply voltage not exceeding 35 kV must be implemented according to this code.
1.0.3 Whether the technical methods and measures adopted in the construction meet the requirements of this code shall be judged by the relevant responsibility subjects. Innovative technical methods and measures shall be demonstrated to meet the performance requirements in this code.
2 Basic requirements
2.0.1 A building electricity project can ensure that power is supplied and distributed to electrical equipment. If a power supply and distribution system or electrical equipment fails and endangers personal safety, it shall be provided with the function of cutting off its power supply within the specified time.
2.0.2 An intelligent building system shall have the function of providing information service for personnel and equipment in the building with communication requirements. If the intelligent system fails, it shall be provided with the function of giving alarm within the specified time.
2.0.3 The room for building electrical equipment and intelligent equipment shall meet the following requirements:
1 It shall not be directly under the next storey of water-accumulated places such as rest room and bathroom; if it is adjacent to the above places, waterproof measures shall be taken;
2 Its ground or door sill shall be higher than the building floor ground. The elevation difference shall not be less than 0.10 m, or 0.15 m if the equipment is mounted on the underground floor;
3 There shall be no irrelevant pipelines and wires crossing;
4 Water pipes shall not be arranged right above electrical equipment;
5 Deformation joints shall not cross the substation, diesel generator room and intelligent system room;
6 The floor shall meet the requirements on load for electrical equipment and intelligent equipment.
2.0.4 The area and equipment layout of the electrical equipment room and intelligent equipment room shall be provided with enough space for wiring and safe distance necessary for maintaining the electrical equipment by operators. The environmental conditions of the electrical equipment room and intelligent equipment room shall meet the operation requirements for electrical and intelligent systems.
2.0.5 A compensation device shall be installed if a busway, cable tray and conduit traverse the deformation joint in the building.
2.0.6 The construction and acceptance of the building electricity and intelligent system must adhere to the principles of safe operation of equipment and safe use of electricity, and the control of process acceptance shall be strengthened.
2.0.7 A operation and maintenance plan shall be formulated and strictly implemented if using the building electricity and intelligent system.
2.0.8 The electrical equipment, wires and cables applied to the building electricity and intelligent system shall be qualified products meeting the corresponding product standards.
2.0.9 Energy-saving technologies and products applied to the building electricity and intelligent system, on the premise of meeting building function requirements, shall ensure that the energy utilization efficiency of building equipment and systems can be improved so as to reduce energy consumption.
3 Design of power supply and power room
3.1 Power supply and power load rating
3.1.1 The main power load rating of civil buildings shall comply with Table 3.1.1.
Table 3.1.1 Main power load rating of civil buildings
Power load level Rating basis of power load Example of applicable buildings Name of power load
Special Level 1) Interruption of power supply endangers personal safety, or causes serious casualties;
2) Interruption of power supply causes significant economic loss;
3) Loads of power supply are not allowed to be interrupted in the critical places and important sites of the building Class I high-rise public buildings higher than 150 m (included) Safety and security system, aviation obstruction lighting, etc.
Level I 1) Interruption of power supply causes personal injury;
2) Interruption of power supply causes huge economic loss;
3) Interruption of power supply affects the normal work of important power users, or causes serious disorder in people-intensive public places Class I high-rise buildings Safety and security system, aviation obstruction lighting, duty lighting, guard lighting, passenger elevator, drainage pump, domestic feedwater pump, etc.
Level II 1) Interruption of power supply causes larger economic losses;
2) Interruption of power supply affects the normal work of important power users or causes disorder in public places Class II high-rise buildings Safety and security system, passenger elevator, drainage pump, domestic feedwater pump, etc.
Class I and Class II high-rise buildings Lighting of main passage, walkway and staircase, etc.
Level III Power load not belonging to Special Level, Level I and Level II — —
3.1.2 The Level I power load shall be powered by two power supplies and shall meet the following requirements:
1 If one power supply fails, the other shall not be damaged at the same time.
2 The capacity of each power supply shall meet the supply requirements of all Level I and Special Level power loads.
3.1.3 The Special Level power load shall be powered by 3 power supplies and shall meet the following requirements:
1 The 3 power supplies shall be composed of two power supplies and one electric source for safety service meeting the Level I load requirements;
2 The capacity of the electric source for safety service shall meet the power supply requirements of the maximum Special Level power load working at the same time;
3 The switching time of the electric source for safety service shall meet the requirements of the allowable shortest interruption duration of Special Level power load;
4 The power supply time of the electric source for safety service shall meet the requirements of the longest continuous operation duration of Special Level power load.
3.1.4 The electric source for safety service shall be composed of power supplies complying with one of the following conditions:
1 Urban power grid independent of normal operating power supply and transmitted by dedicated feeder line;
2 Generating set independent of normal operating power supply;
3 Batteries.
3.1.5 The power user shall be equipped with standby power supply if any of the following conditions is met:
1 The electric source for safety service of Special Level load fails to meet the regulations of Item 1 of Subclause 3.1.4;
2 The secondary power supply equipped fails to meet the requirements of Level I loads;
3 The switching time of the two power supplies fails to meet the requirements of the allowable interruption duration of power supply for current-using equipment.
3.1.6 The building higher than 150 m (included) shall be equipped with a standby diesel generating set.
3.1.7 The generating set used for emergency power supply shall be in self-starting state. In the event of interruption of urban power grid, the generating set shall be able to start up within the specified time.
3.1.8 The photovoltaic system connected with the grid shall be equipped with corresponding functions like grid-connection protection and isolation.
3.1.9 The photovoltaic system shall be equipped with grid-connected controller at the grid-connected positions, as well as special signs and indicative text and symbols.
3.1.10 Electric shock safety protection measures shall be taken and warning signs shall be set for people-accessible conductive photovoltaic modules.
3.2 Electrical installation room
3.2.1 The layout of a substation shall meet the following requirements:
1 If the power distribution room and capacitor room are longer than 7 m, at least two entrances/exits shall be set up.
2 If the electrical installation arranged in rows is longer than 6 m, the passage shall be equipped with at least two exits; if the distance between two exits of the passage after the low-voltage electrical installation is greater than 15 m, an additional exit shall be arranged;
3 The entrance/exit doors of the substation leading directly to the non-substation area shall be Class A fire doors opened outwards;
4 The door set between adjacent high-voltage electrical installation rooms shall be able to open outwards and inwards.
5 In case of different rated voltages of the live part of adjacent electrical installation, the safety clearance shall be determined according to the higher rated voltage; the spacing between electrical installations and the passage width shall meet the requirements of safety clearance.
6 Waterproof and drainage measures shall be adopted for the cable mezzanine, cable trench and cable room of the substation.
3.2.2 In addition to the requirements of 3.2.1, the substation in the civil building shall meet the following requirements:
1 The exposed live conductor or device shall not be installed;
2 The transformer and electrical equipment with combustible oil shall not be installed.
3.2.3 In addition to the requirements of 3.2.1, the substation equipped with a exposed live conductor shall meet the following requirements:
1 The height of the low-voltage exposed live conductor shall not be less than 2.5 m above the ground;
2 The spacing between 3 kV ~ 35 kV electrical installations and the passage width shall meet the requirements of safety clearance;
3 The current-using equipment, exposed laying lighting line, power line or crossed pipeline shall not be arranged above the exposed live conductor.
3.2.4 The layout of the diesel generator room shall meet the following requirements:
1 In the diesel generator room, the distance between units and from the veranda to the wall shall meet the needs of equipment transportation, on-site operation, maintenance and repair and arrangement of auxiliary equipment;
2 If the diesel generator room and the control room are longer than 7 m, at least two entrances/exits shall be provided.
3.2.5 Explosion-proof lamps shall be used in the dedicated battery room. Ordinary switches and power sockets shall not be installed in the room.
4 Design of power supply and distribution
4.1 General requirements
Foreword iii
1 General
2 Basic requirements
3 Design of power supply and power room
3.1 Power supply and power load rating
3.2 Electrical installation room
4 Design of power supply and distribution
4.1 General requirements
4.2 High-voltage distribution system
4.3 Low-voltage distribution system
4.4 Extra-low voltage distribution system
4.5 Electrical lighting system
4.6 Protection against low-voltage electric shock
5 Design of intelligent system
5.1 Information facility system
5.2 Building equipment management system
5.3 Public safety system
6 Design of wiring system
6.1 General requirements
6.2 Indoor wiring
6.3 Outdoor wiring
7 Design of lightning protection and grounding
7.1 Lightning protection
7.2 Earthing system
7.3 Equipotential bonding
8 Construction
8.1 Installation of high-voltage equipment
8.2 Installation of transformer and instrument transformer
8.3 Installation of electric source for safety service
8.4 Installation of distribution box (cabinet)
8.5 Installation of current-using equipment
8.6 Installation of intelligent equipment
8.7 Wiring system
8.8 Lightning protection and grounding
9 Inspection and acceptance
9.1 General requirements
9.2 Inspection for electrical equipment
9.3 Intelligent system testing
9.4 Line detection
9.5 Acceptance
10 Operation and maintenance
10.1 General requirements
10.2 Operation
10.3 Maintenance
10.4 Maintainability
