40 problems and solutions in the design of electrical general drawing

The first part of the building

I. fire protection design

1. The generator and fire water pump are not in the first phase, delaying the first acceptance date.The solution: in the first phase, should be considered to complete the complete set, the skirt building is not decorated, temporarily not use also should design the fire protection system, to be completed before the construction finished can be accepted.

Second, the construction node general disease and the solution measure

1. Wall engineering

(1) electric embedded drawing size should leave allowance as far as possible, such as distribution box, because sometimes the bidding time is civil progress lags behind, if you don't consider each manufacturer equipment size provide reserve size, will lead to waste.

Solution: agree.

2. The integrated

(1) the distribution room is now installed in the basement, the ground should be higher than the floor of the corridor or the waterproof steps are made at the door of the house.

(2) reserved hole is not complete.

Solutions:

A. The building diagram shows the positive pressure air outlet between the stairs.

B. The reserved holes of strong and weak electrical boxes must be marked.

C. All kinds of drains, water pipes must be marked.

D. The straight hole of the gas heater must be marked.

The second part of the equipment

I. major in water supply and drainage

1. The cable ditch in the boiler room communicates with the gutter, causing the water in the cable trench.

Solution: the cable trench should not be connected directly with the gutter, and the cable trench will set up water drainage.

2. The temperature control valve at the spring water system is not considered for special public power supply.

Solution: the design unit of the water and electricity professional coordination, the use of a dedicated public power supply.

2. Heating and ventilation

1. The wind duct and tuyere of partial transformer room are small, and the air volume can't meet the air ventilation requirement in the room.

Solution: the design needs to be based on the ventilation requirements of different rooms.

Three, strong current

1. No insurance is provided in the lamp posts within the area.

Solution: the design must indicate a short circuit and overload protection device.

2. (Beijing and tianjin new city) the electric power well is not clear at the interface between the large municipal and small municipal government. The early works have all set up the hand hole well, and it is very difficult to get the high voltage cable into and out of each block, which is difficult to pass.

Solution: large municipal and small municipal electric power Wells are selected in accordance with the on-site conditions according to the different specifications of manhole well in the design atlas of the 05 series of architectural standards in tianjin.

3. Fire fan, water pump electrical control cabinet installation, secondary control circuit not detailed problems.

Solution: the secondary control circuit in the electric control cabinet of the fire fan and water pump should indicate how to interface with the fire alarm system.

4. The specifications of cable bridge and metal groove are not clearly marked.

Solution: the specifications and dimensions of cable and metal grooves should be clearly marked and can not be omitted.

5. Unclear problems of potential connection design of toilet.

Solution: the equipotential connection of the toilet should be based on the actual layout of the toilet, and the system diagram will be made clear and drawn out in the plan of the floor plan or in the large sample of the toilet.

6. Two circuit breakers are not uniform in front of the dual-power switch (ATS) circuit design.

Solution: it is suggested that two circuit breakers should be removed in front of the dual power switch.Adopt PC level products according to fire requirements,

No CB products are selected.

7. The IC card meter is located in the pipe well, which is inconvenient for the owner to use, and the problem of the pipe well is too small.

Solution: the IC card meter is installed in the public place where the owner is easy to observe. The pipe well space should consider the installation and use of the equipment.

8. Some garden street lamps and garage lighting do not consider the lighting needs of different periods, causing unnecessary waste.

Solution: design should consider multi-channel control mode and night shift lighting circuit.Garden lighting should be controlled by timing controller.

9. The total switch in the household is larger than the power supply switch in the pipe well. If the electrical fault occurs in the user, the switch of the electrical switch will be switched off, causing recovery difficulties and the owner will complain.

Solution: the total switching value of indoor switch should not be greater than that of the superior switch.

10. Some outdoor distribution boxes and cabinets are not waterproof.

Solution: the design should indicate the IP protection level, and strictly follow the design order when purchasing.

11. Much of the cable is not up to design requirements.

The solution: strengthen the supervision work, buried depth should meet the design requirements.

12. The construction of lawn lamp and floor lamp is shallow and shallow. PVC protective effect is poor

Solution: the construction needs to be designed according to the design requirements and the use of heavy PVC pipe.

13. Cracks in the floor of the preburied section of the line tube.

Solution: the steel wire mesh reinforcement is used to prevent cracking of PVC line.Try to avoid the centralization of the line, as far as possible.

14. There are many underground pipelines, which are prone to failure and difficult to find.

Solution: the protection of the cable in the pipe is not allowed to have a joint, and the construction should be done according to the construction specification.

Iv. Weak current part

1. The design should avoid the weak electric box (including other public facilities) in the owner's yard

Solution: after determining the planning plane, other professional design should be carried out in time. The installation location of public facilities should be reserved when planning.

2. The infrared system in use is covered by the landscaping in the garden wall, which can not achieve its true efficacy

Solution: the professional company of the weak current system is in the design of the infrared detection device to set the location and the landscape related major to communicate and confirm before the construction drawing.In order to avoid the peripheral green plant protection, ensure the infrared device protection function.

3. Fire alarm system, some lines have no line number.

Solutions: for bus circuit, power circuit, telephone loop, radio, multi-line linkage control circuit, etc., each circuit and branch circuit must be designed line number, in order to check line installation and debugging and maintenance.

4. Ladder, passenger lift the emergency call system inside the capsules, cannot be used as three-way calling, now the emergency telephone inside the capsules, factor of emergency call by a fire telephone lines connected, call quality cannot guarantee;The phone has no coding position, unable to confirm the source of distress, and cannot implement quick rescue;The emergency call system in the elevator should be enabled to connect with the monitoring center or fire center to ensure the quality of the call and achieve quick relief.

Solution: design a reserved pipeline to meet the three-party call, increase the address code and bring the phone to the post hole.

5. There are no visual intercom at the entrance of the residential area. The security of the entrance guard is not convenient for the landlord, so it is not convenient for security management.

Solution: visual intercom host is installed at the entrance and entrance of the community so that visitors can contact the owner at the entrance of the community and confirm the admission.

6. Door access and visual intercom system are not installed in the garage.

Solution: increase the corresponding security system.

7. Some weak electrical systems (including fire alarm) do not have special protection devices for lightning protection.

Solution: the strong and weak electrical system increases surge protection device and integrated design of lightning protection system.

8. The cell phone capacity of the community is not enough, and the number of units in the vertical well is only 2. The owner can not meet the demand when the owner reports the increase.

Solution: the apartment building is reserved on the total capacity of 2.5 Numbers per household.

There are problems: partial control fire control, closed-circuit television surveillance system, including the camera not using centralized power supply, only the nearest power supply;During the management process, it was found that the power was unplugged and the work was interrupted.

Solution: use centralized power supply, and equipment system should be equipped with emergency standby power.

9. The residential entrance hall and elevator car should consider adding video weak power lines, which can play marketing and other advertisements.

Solution: agree and adopt its approach.

10. The construction quality of the weak current pipeline is not good, the threading is difficult or even worn

Solution: the construction must be carried out according to the construction standard, the fittings of the pipeline are complete.

The comprehensive part

1. Waterproofing - the leakage of the pipe through the floor and the roof of the roof

Solution: select and bury the casing in accordance with the regulations;The casing should be filled with bituminous and waterproof oil.

2. The equipment room lacks the problem of large sample

Solution: the equipment room and the pipe well provide the detailed layout of the equipment and the layout of the section.

3. Professional pipeline conflict of water, electricity and ventilation air-conditioning.

Solution: in the basement, ventilation and air duct and pipe, water supply and drainage pipe, cable bridge, metal trough and bus slot shall be marked on the installation location and height.

4. Sometimes the equipment designed for exclusive production, such as water tank self-cleaning, may increase project cost or quality hidden trouble.

Solution: it is suggested that the design of mature general equipment and products should be used to form competitive selection.

5. In some buildings, the line tube is passed at the kitchen flue, resulting in the failure to install the exhaust duct.

Solution: the design must indicate the exact location of the pipeline and avoid conflict when there is a possibility of such a situation.

6. Power distribution cabinet in low voltage distribution room, not reserved base

Solution: the base block should be added, and the indoor cable trench and drainage ditch should be separated.

7. The drainage ditch in the water pump room (living water room and medium water chamber) should meet the water displacement during the run and overflow of the water tank.

Solution: the design should be calculated to determine the reasonable section size of gutter.

8. The liquid level control system of some water tanks is frequently malfunctioned and has a serious overflow situation.

Solution: select a reliable liquid level control system and alarm signal to the duty room.

9. The elevator was caused by a failure of power failure, causing the owner to complain.

Solution: add automatic level (add emergency EPS).

10. The elevators in the old buildings are in single mode, which increases the operating cost of the elevator and the waiting time of the owner.

The solution: group control.

11. The room temperature of the elevator room is very high in summer, the ventilation equipment inside the machine room can not reduce the indoor temperature, causing the electronic equipment to not work properly.

Solution: add air conditioner in the machine room.

12. The equipment room has not reserved the bearing hook, which is not conducive to the disassembly and maintenance of heavy machinery equipment.

Solution: the equipment room shall be reserved with the necessary support hook (the structure increases the embedded parts).

13. The construction damage pipeline phenomenon is serious.

Solution: various pipes shall be marked.