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GB 55024-2022: General code for building electricity and intelligence
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB 55024-2022 | English | 1959 |
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General code for building electricity and intelligence
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GB 55024-2022
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Standard similar to GB 55024-2022 GB 55031 GB 55030 Basic data | Standard ID | GB 55024-2022 (GB55024-2022) | | Description (Translated English) | General code for building electricity and intelligence | | Sector / Industry | National Standard | | Word Count Estimation | 89,855 | | Date of Issue | 2022-03-10 | | Date of Implementation | 2022-10-01 | | Issuing agency(ies) | Ministry of Housing and Urban-Rural Development of the People's Republic of China; State Administration for Market Regulation | GB 55024-2022: General code for building electricity and intelligence---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
1 General
1.0.1 In order to protect personal health, life and property safety, national security, and ecological environment safety in the construction of building electrical and intelligent system engineering, and meet the basic needs of economic and social management, this specification is formulated in accordance with relevant laws and regulations.
1.0.2 The electrical and intelligent systems of industrial and civil buildings and municipal engineering whose power supply voltage does not exceed 35kV must implement this specification.
1.0.3 Whether the technical methods and measures adopted in the project construction meet the requirements of this specification shall be judged by the relevant responsible parties. Among them, innovative technical methods and measures should be demonstrated and meet the performance requirements in this specification.
2 Basic regulations
2.0.1 Building electrical engineering should be able to transmit and distribute electrical energy to electrical equipment. When the power supply and distribution system or electrical equipment fails to endanger personal safety, it should have the function of cutting off its power supply within a specified time.
2.0.2 The building intelligent system engineering should have the function of providing information services for the personnel in the building and equipment with communication requirements. When the intelligent system fails, it should have the function of alarming within the specified time.
2.0.3 The building's electrical equipment room and intelligent equipment room should meet the following regulations.
1 It should not be located on the floor directly below toilets, bathrooms and other places where water often accumulates, and waterproof measures should be taken when it is adjacent to it;
2.The ground or threshold should be higher than the floor of the floor, and the difference in elevation should not be less than 0.10m, and it should not be less than 0.15m if it is located in the basement;
3 Unrelated pipelines and lines shall not be crossed;
4 Water pipes shall not be set directly above the electrical equipment;
5 There should be no deformation joints passing through substations, diesel generator rooms, and intelligent system rooms;
The ground of the 6th floor shall meet the load requirements of electrical equipment and intelligent equipment.
2.0.4 The area and equipment layout of the electrical equipment room and the intelligent equipment room shall meet the wiring spacing and the necessary safety distance for the staff to operate and maintain the electrical equipment. The environmental conditions of the rooms for electrical equipment and intelligent equipment should meet the operating requirements of electrical and intelligent systems.
2.0.5 Compensation devices should be installed when the busway, cable bridge and conduit pass through the deformation joints of the building.
2.0.6 The construction acceptance of building electrical engineering and intelligent system engineering must adhere to the principles of equipment operation safety and electricity safety, and strengthen process acceptance control.
2.0.7 When building electrical and intelligent systems are used, an operation and maintenance plan shall be formulated and strictly implemented.
2.0.8 The electrical equipment and wires and cables used in building electrical engineering and intelligent system engineering shall be qualified products that meet the corresponding product standards.
2.0.9 The energy-saving technologies and products used in building electrical and intelligent system engineering should improve the energy utilization efficiency of building equipment and systems and reduce energy consumption on the premise of meeting the building function requirements.
3 Power supply and room design
3.1 Power supply and power load classification
3.1.1 The grading of main electricity loads of civil buildings shall comply with the provisions in Table 3.1.1.
3.1.2 The primary power load shall be powered by two power sources and shall meet the following requirements.
1 When one power supply fails, the other power supply should not be damaged at the same time;
2.The capacity of each power supply shall meet the power supply requirements of all first-class and super-class electric loads.
3.1.3 Special power loads should be powered by 3 power sources, and should meet the following requirements.
1.The 3 power sources shall be composed of two power sources meeting the requirements of the primary load and one emergency power source;
2.The capacity of the emergency power supply should meet the power supply requirements of the largest super-grade power load working at the same time;
3 The switching time of the emergency power supply shall meet the requirements of the shortest power supply interruption time allowed by the super-grade power load;
4 The power supply time of the emergency power supply shall meet the requirements for the longest continuous operation time of special-grade power loads.
3.1.4 The emergency power supply shall consist of a power supply meeting one of the following conditions.
1.The urban power grid power delivered by a dedicated feeder line that is independent of the normal working power supply;
2 Generating sets independent of normal working power supply;
3 battery pack
3.1.5 When one of the following conditions is met, the power consumption unit shall set up its own power supply.
1 The emergency power supply for special loads cannot meet the requirements of paragraph 1 of Article 3.1.4 of this code;
2 The second power supply provided cannot meet the requirements of the primary load;
3 The switching time of the two power sources cannot meet the requirements of the allowable power interruption time of the electrical equipment.
3.1.6 Buildings with a building height of 150m and above should be equipped with self-contained diesel generator sets.
3.1.7 The generator set used for emergency power supply should be in the self-starting state. When the city grid power supply is interrupted, the generator set should be able to start within the specified time.
3.1.8 The photovoltaic power generation system connected to the grid should have corresponding grid-connected protection and isolation functions.
3.1.9 The photovoltaic power generation system shall be equipped with a grid-connected control device at the grid-connected place, and shall also be provided with special signs and suggestive text symbols.
3.1.10 Electric shock safety protection measures should be taken and warning signs should be installed on the conductive photovoltaic module parts that are accessible to personnel.
3.2 Room for electrical installations
3.2.1 The substation layout should meet the following requirements.
1 When the length of power distribution room and capacitor room is greater than 7m, at least two entrances and exits shall be provided.
2 When the length of electrical devices arranged in a row is greater than 6m, at least two outlets shall be provided in the channel behind the electrical device; when the distance between the two outlets of the channel behind the low-voltage electrical device is greater than 15m, additional outlets shall be added.
3 The entrance and exit doors directly leading from the substation to the non-substation area in the building shall be Class A fire doors and shall open outwards.
4 When doors are set between adjacent high-voltage electrical equipment rooms, they should be able to open in both directions.
5 When the rated voltages of the live parts of adjacent electrical installations are different, the safety net distance shall be determined according to the higher rated voltage; the distance between electrical devices and the channel width shall meet the requirements of the safety net distance.
6 Waterproof and drainage measures shall be taken for the cable interlayer, cable trench and cable room of the substation.
3.2.2 The substations installed in civil buildings shall meet the following requirements in addition to the requirements of Article 3.2.1 of this code.
1 There should be no exposed live conductors or devices;
2 Transformers and electrical equipment with flammable oil should not be installed.
3.2.3 When the substation is equipped with exposed live conductors, in addition to meeting the requirements of Article 3.2.1 of this code, it shall also meet the following requirements.
1 The height of low-voltage exposed live conductors from the ground shall not be less than 2.5m;
2.The distance between 3kV～35kV electrical devices and channel width shall meet the requirements of safe clearance;
3 No electrical equipment, exposed lighting lines and power lines or pipelines shall be installed above the exposed live conductors.
3.2.4 The layout of the diesel generator room shall meet the following requirements.
1 In the diesel generator room, the distance between the units and the unit corridor to the wall shall meet the needs of equipment transportation, local operation, maintenance and arrangement of auxiliary equipment;
2 When the diesel generator room and control room are longer than 7m, at least two entrances and exits shall be provided.
3.2.5 Explosion-proof lamps shall be used in the special battery room, and ordinary switches and power sockets shall not be installed in the room.
4 Power supply and distribution design
4.1 General provisions
4.1.1 Between emergency power supply and non-emergency power supply. Measures should be taken to prevent parallel operation.
4.1.2 The switching time between the two power supply sources should meet the requirements of the allowable power interruption time of the electrical equipment.
4.1.3 The standby power supply shall meet the requirements of continuous power supply time and power supply capacity of electrical equipment.
4.1.4 When the backup power supply and emergency power supply share the diesel generator set, the following regulations shall be met.
1 The standby power supply and emergency power supply shall have their own power supply bus sections and circuits;
2 The power load of the backup power supply should not be connected to the emergency power supply circuit.
4.1.5 When the fire-fighting load and non-fire-fighting load of civil buildings share diesel generator sets, the following regulations shall be met.
1 A dedicated circuit shall be set for the fire-fighting load;
2.It should have the function of cutting off non-fire-fighting loads in case of fire;
3 It should have the function of alarming or displaying the low level of oil storage.
4.2 High voltage power distribution system
4.2.1 The relay protection device should meet the requirements of reliability, sensitivity, quick action and selectivity.
4.2.2 The short-circuit fault protection of the high-voltage power distribution system should have the function of reliably, quickly and selectively removing the short-circuit fault of the protected equipment and lines.
4.2.3 The household circuit breaker should have overload and short-circuit current delay and quick-break protection function.
4.2.4 Distribution circuit breakers should have overload and short-circuit current quick-break protection functions.
4.2.5 Blocking measures should be taken between the isolating switch and the corresponding circuit breaker and grounding switch.
4.3 Low-voltage power distribution system
4.3.1 For low-voltage power lines introduced from outside the building, electrical appliances with isolation function shall be installed at the receiving end of the main distribution box (cabinet).
4.3.2 The electrical equipment in the refuge area shall adopt a dedicated power supply circuit.
4.3.3 The exposed conductive parts of electrical equipment and external conductive parts are strictly prohibited from being used as protective earthing neutral conductors (PEN).
4.3.4 In the TN-C system, it is strictly forbidden to disconnect the protective earthing neutral conductor (PEN), and any electrical appliance that disconnects the protective earthing neutral conductor (PEN) is not allowed.
4.3.5 In the power supply and distribution system, semiconductor devices shall not be used for isolating appliances; isolators, fuses and connecting pieces shall not be used for functional switching appliances.
4.3.6 The low-voltage power distribution circuit should be provided with short-circuit protection, and the power supply should be cut off before the short-circuit current causes harm.
4.3.7 For the power supply circuit that causes greater loss due to power failure caused by overload, the overload protection should act on the signal alarm and should not cut off the power supply.
4.3.8 AC motors should be equipped with short circuit protection and ground fault protection.
4.3.9 When the reverse rotation of the AC motor will cause danger, there should be safety measures to prevent reverse rotation.
4.3.10 When the controlled electrical equipment needs to be provided with an emergency stop button, the emergency stop button shall be located near the controlled electrical equipment where it is convenient for operation and observation, and shall not reset automatically.
4.4 Extra low voltage power distribution system
4.4.1 The voltage of the extra-low voltage power distribution system should not exceed AC 50V or DC 120V.
4.4.2 The wiring of extra-low voltage power distribution circuits shall meet the following requirements.
1 The cables of extra-low voltage power distribution circuits should use copper core conductors;
2 The copper core conductor shall meet the minimum cross-sectional area and mechanical strength requirements;
3 When the extra-low voltage distribution circuit and the low-voltage distribution circuit are laid in the same metal box, metal isolation measures with grounding shall be adopted.
4.4.3 The lighting circuits powered by safety extra-low voltage (SELV) shall be protected against overload and short circuit.
4.5 Electric lighting system
4.5.1 Buildings should be equipped with lighting power supply and distribution systems. The lighting power distribution terminal circuit should be equipped with short-circuit protection, overload protection and ground fault protection, and the outdoor lighting power distribution terminal circuit should also be equipped with residual current action protective devices as additional protection.
4.5.2 For pools where personnel are allowed to enter, lamps installed under water shall be lamps with Class III protection against electric shock, and the power supply shall comply with the provisions of Article 4.6.7 of this code.
4.5.3 The protection grade of outdoor lamps should not be lower than IP54, the protection grade of buried lamps should not be lower than IP67, and the protection grade of underwater lamps should not be lower than IP68.
4.5.4 When the normal lighting fixtures are installed at a height of 2.5m or less and the fixtures are powered by AC low voltage, a residual current action protective device should be installed as additional protection. When the evacuation lighting and evacuation indicator lights are installed at a height of 2.5m or less, they shall be powered by safety extra-low voltage.
4.5.5 The design of power supply and distribution for evacuation lighting and evacuation sign lamps shall meet the following requirements.
1 The luminaire shall be powered by mains and battery power. Under normal circumstances, the battery pack should be kept in a charging state, and in case of fire, the power supply time of the battery pack should be guaranteed to meet the requirements for safe evacuation.
2 For the centralized control system, its main power supply shall be powered by fire-fighting power supply.
4.5.6 It is strictly forbidden to connect the fire emergency lighting circuit to the switchgear, power socket and other loads other than the fire emergency lighting system.
4.5.7 For public buildings with a fire control room, the fire evacuation lighting and evacuation indication system shall be able to be centrally controlled and monitored in the fire control room.
4.5.8 One of the following measures shall be adopted for the general lighting of public halls and main aisles in crowded places.
1 induction control;
2 Centralized or regional centralized control, when automatic control is adopted for centralized or regional concentration, it shall have manual control function.
4.5.9 As for the glass cover of the suspended lamp installed in a densely populated place, measures should be taken to prevent the glass from breaking and splashing downwards.
4.6 Low voltage electric shock protection
4.6.1 Electrical equipment should adopt one or more of the following low-voltage electric shock fault protection measures according to external influence conditions.
1 Automatically cut off the power supply;
2 double insulation or reinforced insulation;
3 electrical separation;
4 Extra low voltage.
4.6.2 When the electrical equipment adopts the protective device to automatically cut off the power supply as a low-voltage electric shock fault protection measure, for the TN system and the TT system with the nominal line-to-ground voltage of AC 220V, the rated current of the power socket circuit and the rated current shall not exceed 63A. For terminal circuits of electrical equipment with fixed connections exceeding 32A, the maximum time for cutting off the power supply shall comply with the following regulations.
1 The maximum time for the TN system to cut off the power supply should be 0.4s.
2 The longest time for TT system to cut off a single source should be 0.2s; when the TT system adopts over-current protection device to cut off the power supply and adopts protective equipotential bonding measures, the longest time for it to cut off the power supply should be 0.4s.
4.6.3 When electrical equipment adopts double insulation or reinforced insulation as a measure to prevent the expansion of low-voltage electric shock faults, the conductive part in the insulation outer shield is strictly prohibited from being grounded. And there should be a mark of double insulation/reinforced insulation.
4.6.4 When one isolation transformer is used for electrical separation to supply power to one electrical equipment, the following regulations shall be met.
1 The isolation transformer should not be functionally grounded;
2 It is strictly forbidden to ground the exposed conductive parts of the electrical equipment;
3 The separated circuit should not be connected to the ground or other circuit protection conductors and exposed conductive parts.
4.6.5 When the residual current operating protective device is used as an additional protective measure for electric shock protection, the following regulations shall be met.
1 The rated residual current operating value should not be greater than 30mA.
2 The following circuits whose rated current does not exceed 32A should be installed with residual current operating protective devices.
1) Power socket circuit for general personnel;
2) Indoor mobile electrical equipment;
3) Outdoor electrical equipment accessible to personnel.
3 The residual current operating protective device should not be used as the only protection measure.
4 When the residual current action protective device is used, a protective earthing conductor (PE) should be installed.
4.6.6 The electric shock protection measures for places equipped with fixed bathtubs or showers shall meet the following requirements.
1.The electrical equipment in Zone 0 shall be protected by safety extra-low voltage (SELV) whose rated voltage does not exceed AC 12V or DC 30V, and the power supply device shall be installed outside Zone 0 and Zone 1;
2.The electrical equipment installed in Zone 0 and Zone 1 shall adopt a fixed permanent connection method;
3.Switchgear, control equipment, power sockets and junction boxes shall not be installed in Zone 30;
4 In rooms with bathtubs and/or showers, auxiliary equipotential bonding should be provided as additional protection.
4.6.7 The electric shock protection measures for swimming pools, paddling pools and places for people to swim, play in water or other similar activities shall meet the following requirements.
1 Electrical equipment in Zone 0 and Zone 1 shall be powered by safety extra-low voltage (SELV) with a rated voltage not exceeding AC 12V or DC 30V, and the power supply device shall be installed outside Zone 0 and Zone 1;
2.The electrical equipment in Zone 0 and Zone 1 should be installed with fixed electrical equipment dedicated to swimming pools;
3.Switchgear, control equipment, power sockets and junction boxes shall not be installed in zone 30;
4 In Zone 0, Zone 1 and Zone 2, auxiliary equipotential bonding shall be set as additional protection.
4.6.8 Fountain pools and ponds where people are allowed to enter shall be implemented in accordance with the regulations and requirements of Zone 0 and Zone 1 of the swimming pool. For fountain places where personnel are not allowed to enter, the electric shock protection measures shall meet the following regulations.
1.One or more of the following protective measures should be taken for the electric shock protection measures in Zone 0 and Zone 1.
1) Safety extra low voltage (SELV) protection is adopted, and the power supply device is installed outside Zone 0 and Zone 1;
2) Use residual current action protective devices as additional protection;
3) Adopt electrical separation measures in accordance with Article 4.6.4 of this code, and the power supply device is installed outside Zone 0 and Zone 1.
2.The electrical equipment in zone 0 and zone 1 shall take measures to prevent people from being touched.
3 Measures shall be taken to comply with the provisions of paragraphs 3 and 4 of Article 4.6.7 of this code.
4.6.9 The electric shock protection measures for places equipped with sauna heaters shall meet the following requirements.
1 Only sauna heaters and their accessories should be installed in area 1;
2 No power socket shall be provided;
3 Except for the sauna heater, the power distribution circuit in the place shall adopt the residual current operating protective device whose rated residual current operating value is not greater than 30mA as additional protection.
4.6.10 The electric shock protection of heating cable radiant heating equipment, electric equipment for public kitchens, solar water heaters with electric auxiliary heating, lift parking equipment, and outdoor metal electric doors accessible to personnel shall be equipped with additional protection against electric shock, and shall meet the following requirements. Regulation.
1 The residual current operating protective device whose rated residual current operating value is not greater than 30mA should be used;
2 Auxiliary equipotential bonding shall be provided.
5 Intelligent system design
5.1 Information facility system
5.1.1 The design of the information access system shall meet the following requirements.
1 The information access system should have the function of accessing the public information and special information required in the building, the communication network and the cable TV network should be connected to the building where there is demand, and the information access system facility room should be reasonably configured.
2 In areas where optical fiber transmission has been realized in the public information network, the construction of information facilities must adopt the method of fiber-to-user or fiber-to-user unit.
5.1.2 Buildings should be equipped with information network systems. The information network system should meet the requirements of building functions, business needs and information transmission, and should be equipped with information security equipment and network security management system.
5.1.3 The communication system design should meet the following requirements.
1 Public buildings should be equipped with public communication facilities suitable for communication planning;
2 The public mobile communication signal should cover the underground public space of the building and inside the passenger elevator car.
5.1.4 The design of cable television system shall meet the following requirements.
1 Users who set up their own front-end should set up program source monitoring facilities;
2 The output level of the cable TV system terminal should meet the requirements of the user's receiving equipment for the input level.
5.1.5 The design of the public address system shall meet the following requirements.
1 The public address system should have the function of releasing voice broadcasts in real time. When the public address system has multiple voice broadcasting purposes, one broadcasting microphone shall have the highest broadcasting priority.
2 The emergency broadcast shall have the highest priority, and the continuous power supply time of the backup power supply of the emergency broadcast system shall be consistent with the continuous power supply time of the backup power supply of the fire evacuation indication sign lighting.
3 The public address system should be able to play warning signals (including sirens), alarm voices or real-time command voices to relevant broadcasting areas within 10s of manual or alarm signal triggering.
4 Based on the on-site ambient noise, the signal-to-noise ratio of emergency broadcasts should be equal to or greater than 12dB.
5.1.6 The design of the hall sound reinforcement system shall meet the following requirements.
1 The sound reinforcement system in the hall should not cause environmental noise pollution to the personnel activity area outside the service area;
2 The speaker system must have reliable safety measures and should not produce mechanical noise.
5.1.7 The conference system and conference simultaneous interpretation system should have the function of linkage with the automatic fire alarm system.
5.2 Construction Equipment Management System
5.2.1 The design of building equipment management system shall meet the following requirements.
1 should support open system technology;
2 It should have the functions of system self-diagnosis and automatic isolation of faulty components, automatic wake-up, fault alarm and automatic monitoring;
3.It should have the functions of parameter over-limit alarm and execution of protection action, and feed back its action signal;
4 When the building equipment management system is associated with other building intelligent systems, communication interfaces with other building intelligent systems shall be configured.
5.2.2 The underground motor garage equipped with a building equipment management system shall be equipped with a carbon monoxide concentration monitoring device linked with the exhaust equipment.
5.2.3 When the ventilation and air-conditioning system adopts electric heaters, the building equipment management system shall have the monitoring functions of interlocking electric heaters and air blowers, electric heater power cut-offs without wind, over-temperature power cut-off protection and alarm devices, and have corresponding monitoring functions. The monitoring function of the fan system to stop after running after a delay.
5.2.4 The setting of the building energy efficiency supervision system should not affect the functions of energy-consuming systems and equipment, and should not reduce the technical indicators of energy-using systems and equipment.
5.2.5 The building equipment management system shall establish an information database, and shall have the function of forming operation records as required.
5.3 Public Safety System
5.3.1 The fire-fighting water pump, smoke prevention and smoke-exhausting fan shall adopt linkage/chain control mode, and a manual control fire-fighting water pump start-up device shall also be installed in the fire control room.
5.3.2 The fire control room shall reserve a communication interface for reporting to the superior fire monitoring center.
5.3.3 The security monitoring center shall have safety protection measures to prevent abnormal entry and external communication functions, and shall reserve a communication interface for receiving alarms from the alarm center to the superior.
5.3.4 The security monitoring center shall be powered by a dedicated circuit, and the security system shall be powered according to its load level.
5.3.5 The safety protection system should have an anti-sabotage alarm function; the cables of the safety protection system should be laid in conduits or cable trough boxes.
5.3.6 The entrance and exit control system and the parking garage (field) management system shall be able to receive the fire linkage control signal, and shall have the function of releasing the access control.
5.3.7 The detection sensitivity of the video surveillance camera should be compatible with the minimum ambient illumination of the surveillance area.
5.3.8 Video surveillance cameras should be installed at the upper and lower ports of escalators in public buildings.
6 Wiring system design
6.1 General provisions
6.1.1 The laying of power cables, control cables and intelligent cables shall comply with the following regulations.
1 Power cables of different voltage levels should not share the same conduit or cable tray for wiring;
2 Power cables and intelligent cables should not share the same conduit or cable tray for wiring;
3 When laying power cables in the ceiling with combustible materials or in the suspended ceiling, it should be protected by conduits or cable troughs made of non-combustible materials.
6.1.2 The total sectional area of the distribution wires in the conduit and cable trough box should not exceed 40% of the sectional area of the conduit or cable trough box; the total sectional area of the control cables in the cable trough box should not exceed the cross-sectional area of the cable trough box 50% of the area.
6.1.3 The outdoor power supply and distribution lines within the red line of civil buildings should not be laid by overhead lines.
6.1.4 In closed cable passages such as tunnels, pipe galleries, shafts, interlayers, etc., heat pipes and pipes for conveying flammable gases or liquids shall not be arranged.
6.2 Indoor Wiring
6.2.1 When cables in indoor dry places are routed through conduits, they shall comply with the following regulations.
1 When using metal conduit for wiring, its wall thickness should not be less than 1.5mm;
2 When using plastic conduits for concealed wiring, no less than medium-sized conduits should be selected.
6.2.2 When laying cables in damp indoor places, the following requirements shall be complied with.
1 Conduits made of moisture-proof and anti-corrosion materials or...
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