Common sense of temporary electricity consumption in construction site

1. Safety Points of Temporary Power Utilization in Construction Site

Temporary power consumption:

1. 1, if there are five or more temporary power consumption equipment, or the total capacity of the equipment is above 50KW, the temporary power consumption organization design shall be prepared; When the temporary electricity consumption is less than 5 sets or the total capacity of the equipment is less than 50KW, measures for safe electricity consumption and electrical fire prevention should be taken.

1.2. Temporary power consumption on the construction site must be compiled by electrical engineering technicians, and the construction organization design or scheme can be implemented only after it is reviewed by the technical director and approved by the project director.

1.3. Electricians on the construction site must hold relevant certificates and participate in continuing education and safety technical training according to relevant regulations.

1.4. Safety technical files must be established for temporary electricity utilization on the construction site, including: the construction organization design scheme for temporary electricity utilization; Technical disclosure materials; Temporary electricity inspection and acceptance form; Inspection and debugging records of electrical equipment; Grounding resistance test record; Regularly check the review records; Electrical maintenance records, etc.

2. External protection

2. 1 If the transformer is within the revolving radius of the tower crane or the outer edge of scaffolding and tic-tac-toe frame is less than the minimum safe distance [6m], external protective measures must be formulated, guardrails, fences or protective nets should be set up, and warning signs should be hung at the site.

2.2, the erection of fences, fences or protective nets and other protective measures, should be in the construction site after the erection of high-voltage lines, installation of transformers, before sending, it is forbidden to live work. Insulating materials must be selected for external protection, and conductive materials are strictly prohibited.

3. Laying of temporary power lines

3. 1, the power supply line adopts concrete poles, which are erected with five blocks (the buried depth of concrete poles is110+0.6m) or buried through pipes. Overhead lines should be arranged in the order of yellow, green, red (phase line), blue (working zero line) and yellow/green line (protection zero line) from top to bottom. In order to meet the requirements of mechanical strength, the cross section of insulated copper wire of overhead line should not be less than 10mm2, the cross section of zero line of single-phase line is the same as that of phase line, and the cross sections of working zero line and protection zero line of three-phase five-wire system should not be less than 50% of that of phase line.

3.2. TN-S neutral protection system, namely "three-phase five-wire system", must be adopted for temporary power consumption on the construction site. The working zero line (N line) should be separated from the protection zero line (PE line) and cannot be mixed. The "PE line" shall be led out from the working grounding line of the transformer or the working zero line of the main distribution room or the working zero line of the power supply side of the primary leakage protector.

3.3, protect the zero line in addition to the distribution room or distribution box must be repeated grounding, also must be repeated grounding in the middle and end of the distribution line. The grounding resistance value of each repeated grounding device protecting the zero line shall not be greater than10Ω.

4. Power supply and distribution equipment

4. 1, the construction site must be set up with a main power distribution room, which is made of brick walls, with reinforced concrete or other fireproof insulation materials poured at the top. The room should be dry, ventilated and at room temperature, with a fire resistance rating of not less than Grade III. The rated current of the disconnector in the main power distribution box must be less than that of RT0 melt installed by the power supply department. The panel of the main distribution box shall be equipped with voltmeter, switch and ammeter for monitoring three-phase voltage, with the upper end not less than 0.5m from the ceiling, the width of the front operation channel not less than 1.5m, and the width of the rear and side maintenance channels not less than1m.. The door of the power distribution room is opened and locked outward, and a sand box and an insulating fire extinguisher are set.

4.2. "Three-level power distribution and two-level protection" must be implemented for temporary power consumption on the construction site. After the power cord is connected to the electrical box, it passes through the isolating switch and then enters the leakage switch. The primary and tertiary power distribution must be equipped with leakage protection devices.

2. What are the requirements for temporary electricity consumption in the construction site?

Construction plan 1. Temporary power consumption is independently designed by the project engineer, and temporary power consumption projects are regularly tested. Electricians must be operated by certified personnel.

2. The power distribution on the construction site shall be arranged in accordance with the Technical Specification for Safety of Temporary Electricity Use on the Construction Site. The power supply system adopts TN-S protective conductor and neutral conductor grounding system separately, and the three-phase five-wire power supply system must meet the requirements of three-level distribution and two-level protection. 3. Each electrical equipment must meet the requirements of "one machine, one brake and one leakage box", the line signs should be clear, the leads should be neat, and each electrical box should have doors and locks to meet the requirements of rain and moisture. The electrical equipment used shall conform to the current national standards and shall have a certificate of conformity. The equipment should have a nameplate, and the electrical equipment in use should be kept in good working condition.

4. The power distribution room must meet the requirements of "Four Preventions and One Ventilation" to ensure fire prevention, moistureproof, waterproof, animal prevention and good ventilation. The room should be equipped with insulation equipment, supporting electrical fire fighting equipment, emergency lighting and other safety appliances. 5, the establishment of temporary electricity construction organization design and safety technical measures for examination and approval system, and establish the corresponding technical files.

6. Establish a technical degree of * * * and introduce the general intention, technical content and matters needing attention of temporary electricity construction organization design and safe electricity technical measures to professional electricians and all kinds of electricity users, and perform the signing procedures of the disclosure person and the disclosure person on the written materials of technical disclosure, indicating the disclosure date. 7. Establish a safety inspection system.

Starting from the temporary power utilization project, the temporary power utilization project shall be tested regularly, including the grounding resistance value, insulation resistance value of electrical equipment, operation parameters of leakage protector, etc. 8. Establish electrical maintenance system, strengthen daily and regular maintenance work, discover and eliminate hidden dangers in time, and establish maintenance records, recording maintenance time, place, equipment, content, technical measures, treatment results, maintenance personnel and acceptance personnel.

9, the establishment of engineering demolition system. After the completion of the project, the demolition of the temporary electricity utilization project should have unified organization and command, and the demolition time, personnel, procedures, methods, precautions and protective measures should be specified.

10, establish patrol inspection and assessment system. Construction management departments and enterprises should regularly inspect and evaluate the site electricity safety according to JGJ59-99 "Safety Inspection Standard for Building Construction".

1 1. Establish a responsibility system for safe electricity utilization, and implement the operation, supervision and maintenance of all parts of the temporary electricity utilization project to people, supplemented by necessary rewards and punishments. 12, establish a safety education and training system, and regularly conduct electricity safety education and training for professional electricians and various electricity users.

Anyone who takes up the post must hold a post certificate issued by the relevant department, and it is strictly forbidden to take up the post without a license. [1] The electrical equipment is set 1, and the power distribution system is set with indoor main distribution box and outdoor distribution box or outdoor main distribution box and distribution box, and the distribution is carried out at different levels.

2. Power distribution box and lighting distribution box should be set separately. If placed in the same distribution box, the power and lighting lines should be set separately, and the lighting line should be connected to the upper side of the power switch. 3. The switch box should have a final distribution box, and there should be one brake and one leakage in the switch box. Each electrical equipment should be equipped with its own switch box. It is forbidden to directly control two or more electrical equipment with one switching appliance.

4. The main distribution box should be located near the power supply, and the distribution box should be installed in the area where the electrical equipment or load is relatively concentrated. The distance between the distribution box and the switch box should not exceed 30m, and the horizontal distance between the switch box and the fixed electrical equipment it controls should not exceed 3m. 5, distribution box, switch box should be installed in a dry, ventilated, normal temperature place, shall not be installed in harmful media such as gas, flue gas, steam, liquid with serious loss.

Nor should it be installed in a place that is vulnerable to the impact of foreign solid objects, strong vibration, liquid splashing and heat source baking. Around the distribution box and switch box, there should be enough space for two people to work at the same time, and articles that hinder operation and maintenance should not be piled around.

6, distribution box, switch box installation should be correct and firm, mobile box is located in a solid bracket. The vertical distance between the lower surface of fixed distribution box and switch box and the ground should not be greater than 1.3m, nor should it be greater than1.5m. ..

Mobile distribution box and switch box are made of iron plate or high-quality insulating material. The thickness of iron plate should be greater than1.5m.

7. The inlet and outlet of distribution box and switch box should be located at the bottom of the box, and it is forbidden to be located at the top, side, back or door of the box. [2] Electrical equipment installation 1. The electrical appliances in the distribution box should be installed on the metal or non-wood insulated electrical appliance installation board first, and then fastened in the distribution box as a whole. The metal plate should be electrically connected with the distribution box, and the metal plate should be electrically connected with the distribution box.

2. The electrical appliances in the distribution box shall be fixed in the specified position with the mounting plate, and shall not be skewed or loose. In addition, the distance between electrical equipment and the surrounding environment should meet the requirements of relevant process standards.

3. The working zero line in the distribution box and switch box should be connected by terminal board, and the protective zero line terminal should be set separately. 4, distribution box, switch box connection adopts insulated wire, wire type and cross section should strictly implement the temporary electricity drawing section.

The connecting wires between various instruments shall be insulated copper wires with a cross section of not less than 2.5 mm. The wire joints shall not be loose and there shall be no exposed live parts.

5. The cables at the back of the distribution box should be arranged neatly. Bundle them into bundles, and the incoming and outgoing lines behind the tray should be properly redundant for easy maintenance.

6, wire exploitation to prevent wire core damage is too long, wire pressure head should be solid and reliable, multi-strand wire should not be coiled, pressure welding, multi-strand wire should be rinsed tin before pressure welding, and shall not reduce the number of wire shares. 7. Operators and maintenance personnel of electrical equipment must meet the following requirements: a. The construction and maintenance of temporary electricity consumption on the construction site must be completed by professional electricians who have obtained post certificates after training, and junior electricians are not allowed to carry out intermediate or advanced operations.

B, all kinds of electricity users should do: a, master the basic knowledge of safe electricity use and the performance of the equipment used. B, before using the equipment, you must wear and equip the corresponding labor protection articles according to the regulations; And check whether the electrical devices and protection facilities are in good condition.

It is forbidden to operate the equipment "with illness". C, stop using the equipment must switch power, lock the switch box; D, responsible for protecting the load line of the equipment used, protecting the zero line and the switch box, and solving problems in time when found.

Carry or move.

3. The construction site temporary electricity specification

Temporary power consumption on the construction site refers to the power supply and lighting of mechanical equipment provided by temporary power lines, installed electrical appliances and distribution boxes, and the Technical Specification for Temporary Power Consumption on the Construction Site (JGJ46-2005) must be implemented.

Chapter *** 10 of this manual mainly includes: general principles, terms and specifications, temporary power management, protection of external power lines and electrical equipment, grounding and lightning protection, power distribution room and its own power supply, power distribution lines, distribution boxes and switch boxes, electric construction machinery and hand-held power tools, lighting, etc. In the book, the clauses in Technical Specification for Safety of Temporary Electricity Use in Construction Sites (JGJ 46—2005) are briefly analyzed one by one, and the corresponding safety measures (safety technical measures and safety management measures) and the key points of implementation and inspection are defined.

This paper lists the common hidden dangers in the construction site, and puts forward some corresponding preventive measures, which creates conditions for better implementing the specifications and ensuring the safety of electricity consumption in the construction site. There is an appendix at the back of this book.

This manual can be used as a reference book for electrical engineering technicians, site electricians and full-time project safety personnel in construction enterprises to design, construct, maintain and manage temporary electricity consumption on site, and also as a teaching material for technical training of temporary electricity consumption on the construction site. Extended data:

In order to strengthen the safety construction management of the project, ensure the safety of employees in the production process and promote the development of production, the safety requirements of the construction site of the project department are now formulated, and all units are expected to comply with them: 1. All personnel must wear safety helmets correctly when entering the construction site.

2. It is forbidden to wear hard-soled shoes, slippers, spiked shoes and shirtless (* * * clothes) for aerial work. 3, high homework, dangling homework, must wear a qualified seat belt.

4. Smoking is strictly prohibited on the construction site, and smoking is allowed in the designated area. 5. Don't drink before going to work and don't do homework after drinking.

6. Without the approval of the construction director, no one is allowed to dismantle or move the protective facilities and safety devices at will. 7, are not allowed to throw any material from a height.

8, the scene of all kinds of mechanical equipment, electrical equipment, non-working personnel shall not be arbitrarily used, disorderly pull disorderly wiring. 9, in the production area and living area of the construction site, are not allowed to urinate anywhere, littering and meals, in violation of the safety discipline of the construction site.

10. The notices, forms and rectification notices of potential safety hazards issued by the project quality and safety office must be rectified and fed back in time. 1 1, special operations personnel must hold relevant certificates or their certificates are consistent with those of people.

12, it is forbidden to play and frolic in the operation area. 13, it is forbidden to violate the safety operation procedures, and the project department has the right to punish those who don't listen to the advice of the safety officer.

14. The wires and cables on the construction site should be overhead, and it is forbidden to crush the cables and wires with a hopper. 15, it is forbidden to directly plug the power cord into the power socket without a power plug.

16, it is forbidden not to take the safe passage, climb and jump, and climb over the scaffold. 17, it is forbidden to arbitrarily use fire control facilities for other purposes.

18, it is forbidden to cook or use high-power appliances in the dormitory. 19, the operation procedures should be strictly implemented in the construction, and illegal command, illegal operation and risky operation are strictly prohibited.

20. Newcomers must report in time and have safety education. It is forbidden to work without safety education. 2 1, it is forbidden to pile up all kinds of materials on scaffolding, scaffolding must be spread all over and tied to the head.

22, it is forbidden to unloading platform overweight and not timely transfer of materials. 23, it is forbidden to template support scaffolding, overweight, ultra-high stacking materials or less than time to spread out.

24. The construction site must be cleaned up after work. 25, it is forbidden to material heap, the place, not neat, no sign.

26. After the construction is completed, the power supply of machinery and lighting lamps must be turned off. 27. Welding operations in places with obvious signs prohibiting fireworks or other inflammable and explosive places must be carried out with hot certificates.

28, machinery must be fixed personnel operation, non-mechanical operators shall not start the machinery without authorization, without permission, shall not be engaged in this type of work, the operator shall not leave without authorization. 29. During the construction period, it is forbidden to be tired or work in spite of illness.

30, each type of work is strictly prohibited in the floor, limb, scaffolding and other dangerous places that endanger personal safety to rest or play. 3 1, non-operating personnel, family members and children are strictly prohibited from entering the construction site.

32. Non-electricians are forbidden to engage in electrical work. 33, tower crane operation must have witness operation and witness command.

34. It is forbidden to overload the construction elevator, and all kinds of safety facilities must be complete and effective. 35. It is forbidden to knock and throw steel pipes, steel molds or other objects that are prone to high noise at the construction site.

36, the construction site must be wet, covering operation, control dust. 37, the construction site electrician, machine operator, tower crane driver, tower crane command and other special types of work are strictly prohibited to leave their posts.

38, tower crane commanders, it is forbidden to command or do other things that have nothing to do with the command. 39, welding machine used in the construction site must have a reliable safety leakage protection device (secondary protection device).

40. It is forbidden to block and throw steel pipes and fasteners around when the formwork is dismantled. 4 1, it is forbidden to pry open the template without following the operation procedures; It is forbidden to stand on the steel pipe rack to install and dismantle the formwork.

42. It is forbidden to hoist materials on the construction site without binding them firmly according to safety regulations. 43, elevator shaft, reserved hole, safety protection around the building must be closed in time.

44, oxygen, acetylene bottle operation must ensure enough safety distance (10 meters). 45, it is forbidden to scaffolding, not according to the plan frame plate must be spread, every two steps with a horizontal safety net closed.

46, the subcontract construction units, prohibit the use of child labor, underage workers and elderly workers. 47. Disabled people with physical defects are not allowed to be used on the construction site.

48, the construction site roads must be kept clear, without sundry, stones and other dangerous goods. All construction units must strictly abide by the above provisions, and relevant personnel will be held accountable if there is any violation.

Baidu Encyclopedia-Implementation Manual of Technical Specification for Temporary Electricity Safety in Construction Site.

4. What should I pay attention to when using electricity temporarily on the construction site?

1. Temporary power consumption on the construction site must be designed and approved by the construction organization.

2. Installation, maintenance or removal of temporary electricity projects must be completed by electricians, who must hold electrician operation certificates.

3. The cable must use five-core cable. Cable trunk lines should be laid underground or overhead. Laying along the ground is strictly prohibited, and mechanical loss and medium corrosion should be avoided. Overhead lines must be erected on special poles, and it is forbidden to be erected on trees and scaffolding.

4. TN-S neutral protection system must be adopted for power lines, and the setting of protection zero line must comply with technical specifications.

5. The electrical box must meet the requirements of "three-level distribution, two-level protection" and "one switch for one box", and a leakage protector must be installed at the same time.

6. The temporary electricity consumption on the construction site must be checked and accepted by the supervisor, who will issue the use license.

5. What problems should be paid attention to in the construction of temporary electricity?

1. Rated capacity of electrical equipment during peak construction period. 2. Maximum load of domestic electricity and equipment electricity. 3, temporary electric field layout, the direction of the line, to ensure the economy. 4. Set up a three-level electrical box with leakage protector near the electrical equipment, and adopt three-phase five-wire system for temporary construction on site. 5, wet parts with 36V low voltage lighting. According to the regulation of "three-level power distribution and two-level leakage protection", the distribution box with integrated lighting and power is provided with a main switch and a sub-switch. When the distribution box is more than 50m away from the power supply, it is repeatedly grounded, and its grounding resistance is not more than 10 ohm. The metal shell of all kinds of electrical equipment is protected by zero connection. 36V safety lighting should be used in damp parts of corridors and basements. 6. Before cable laying, insulation test shall be conducted, the insulation resistance value shall not be lower than10mΩ, and the cable fixing point shall meet the specification requirements. 7, mobile lighting installation height, indoor shall not be less than 2.4 meters, outdoor shall not be less than 3 meters, the power cord needs to use rubber cable, conform to the requirements of the specification.

6. What are the requirements for temporary electricity consumption at the construction site?

Requirements:

1, the power distribution system should be equipped with indoor main distribution box and outdoor distribution box or outdoor main distribution box and distribution box, and the distribution should be carried out at different levels.

2. Power distribution box and lighting distribution box should be set separately. If placed in the same distribution box, the power and lighting lines should be set separately, and the lighting line should be connected to the upper side of the power switch.

3. The switch box should have a final distribution box, and there should be one brake and one leakage in the switch box. Each electrical equipment should be equipped with its own switch box. It is forbidden to directly control two or more electrical equipment with one switching appliance.

4. The main distribution box should be located near the power supply, and the distribution box should be installed in the area where the electrical equipment or load is relatively concentrated. The distance between the distribution box and the switch box should not exceed 30m, and the horizontal distance between the switch box and the fixed electrical equipment it controls should not exceed 3m.

5, distribution box, switch box should be installed in a dry, ventilated, normal temperature place, shall not be installed in harmful media such as gas, flue gas, steam, liquid with serious loss. Nor should it be installed in a place that is vulnerable to the impact of foreign solid objects, strong vibration, liquid splashing and heat source baking. Around the distribution box and switch box, there should be enough space for two people to work at the same time, and articles that hinder operation and maintenance should not be piled around.

6, distribution box, switch box installation should be correct and firm, mobile box is located in a solid bracket. The vertical distance between the lower surface of fixed distribution box and switch box and the ground should not be greater than 1.3m, nor should it be greater than1.5m. Mobile distribution box and switch box should be made of iron plate or high-quality insulating material. The thickness of iron plate should be greater than1.5m.

7. The inlet and outlet of distribution box and switch box should be located at the bottom of the box, and it is forbidden to be located at the top, side, back or door of the box.

Extended data

Installation of temporary electrical equipment for construction:

1, the electrical appliances in the distribution box should be installed on the metal or non-wood insulated electrical appliance installation board first, and then fastened in the distribution box as a whole, and the metal plate should be electrically connected with the distribution box.

2. The electrical appliances in the distribution box shall be fixed in the specified position with the mounting plate, and shall not be skewed or loose.

3. The working zero line in the distribution box and switch box should be connected by terminal board, and the protective zero line terminal should be set separately.

4, distribution box, switch box connection adopts insulated wire, wire type and cross section should strictly implement the temporary electricity drawing section.

5. The cables at the back of the distribution box should be arranged neatly. Bundle them into bundles, and the incoming and outgoing lines behind the tray should be properly redundant for easy maintenance.

6, wire exploitation to prevent wire core damage is too long, wire pressure head should be solid and reliable, multi-strand wire should not be coiled, pressure welding, multi-strand wire should be rinsed tin before pressure welding, and shall not reduce the number of wire shares.

7, electrical equipment operation and maintenance personnel must meet the requirements.