What are the specific electrical wiring processes?

There are two main categories. One is disconnection, which is safe and reliable, but the amount of work is large and uneconomical.

A type of uninterrupted line, with pre-branch cable, that is, the branch cable and the main cable have been connected in advance; One is the T-type joint, which is fixed by peeling, and the other is the insulation puncture technique, which is similar to the T-type joint, but it is pressed directly through a professional tool and does not need to be peeled.

Single-strand stranding, multi-strand stranding, crimping, cannon jointing, welding, T-jointing, etc.

Control panels, tables, cabinets, button cabinets.

The control panels, tables, cabinets and boxes provided by the supplier shall provide environmental protection for the equipment installed inside or on them, that is, they can be dustproof, drip-proof, anti-corrosion, moisture-proof, anti-condensation, insects and rodents, can withstand the specified high and low temperature and vibration of the supporting structure, and the protection level of the panel cabinet for indoor installation shall not be less than IP44,) and the protection level of the panel cabinet for outdoor installation shall not be less than IP56.

The design, material selection and process requirements of the control cabinet should be smooth and tidy on the inside and outside, with no welds, rivets or bolt heads on the outside.

The control cabinet should be strong enough to withstand all accidental stresses such as electrical short circuits during handling, installation and operation, and the thickness of the steel plate should be at least 3mm.

When there are heating components installed in the control cabinet, if natural ventilation alone cannot provide good heat dissipation, a forced ventilation device should be installed to ensure that the internal temperature does not exceed the allowable temperature limit value of the equipment during operation.

There should be 220VAC lights and access sockets inside the control cabinet, and the equipment in the cabinet should have signs.

The dimensions of the control cabinet are 800x700x2260 and the control cabinet color is RAL 7035.

The cable is introduced from the bottom of the control cabinet, and sufficient space should be reserved in the cabinet to facilitate wiring.

The control cabinet should use double-open cabinet doors, and set up cabinet locks, document bags and other ancillary equipment on the cabinet door, but it is not allowed to install electrical equipment, and special needs need to be confirmed by the buyer. The model of the door lock and the size of the document bag shall be determined by the buyer.

There should be a margin for electrical equipment, terminal strips, trunking, etc. in the panel. There should be a margin of 15 20% for electrical switches and terminal strips, and no less than 60% for the trunking.

All equipment power supply switches should have reliable electrical protection such as overload protection and short-circuit protection.

The arrangement of the control cabinet equipment should fully consider the requirements of installation and maintenance, and leave appropriate space.

The wiring in the control cabinet should be PCV-insulated standard conductors. The selection of wire diameter should consider the load current, and the wire diameter of the wire used for the control signal should not be less than. The color of the wire sheath should meet the requirements of the color code, and the specific requirements are as follows:

The live wire uses a red sheath wire, the neutral wire uses a blue wire, the grounding wire uses a yellow and green variegated wire, the DC positive wire uses a red wire, the DC negative wire uses a black wire, and the other signal wires use a gray wire.

The wire number, equipment identification, and name plate should be clearly identified and not faded.

The instrument grounding and safety grounding bus should be provided in the control cabinet, the current section of the instrument grounding and safety grounding bus should meet the requirements, and the instrument grounding should be insulated from the control cabinet.

The terminal blocks and mounting accessories in the control cabinet are from the Phoenix series.

The electrical main wiring is as follows:

The main wiring of the high-voltage distribution device is divided into two types, one is the wiring with the busbar

Includes: single bus wiring; Single bus segmented wiring; Double-busbar wiring; Double-busbar segmented wiring; Wiring of additional bypass bus or bypass disconnector;

The other is the wiring of the busbarless bus: including: transformer-line unit wiring; Bridge wiring (inner bridge wiring and outer bridge wiring) 3 5 angular wiring.

In some special cases, a semi-circuit breaker is also used.

The main wiring has double bus, three sections (or four sections), with bypass bus (or with bypass isolation switch) wiring; wiring of a half-circuit breaker; Transformer-busbar wiring and 3 5 angular wiring.

Other wiring includes: multi-segment wiring of ring bus; 1 has 1 3 circuit breakers wiring.

3.Large power plants (with a total capacity of more than 1000MW) have generator-transformer unit wiring; generator-transformer enlargement unit wiring; Generator--transformer-line unit wiring; One factory and two wars.

4.The main wiring of small and medium-sized power plants (with a total capacity of 200 1000MW) includes: the connection mode of the generator; the connection mode of the main transformer; wiring of generator voltage distribution devices; the connection method of the current-limiting reactor; Wiring of medium-sized power plants without generator voltage distribution devices.

The form of the main wiring should meet the three basic principles of reliability, flexibility and economy.

Hope it helps.

Generally, the cable enters the distribution box cavity and needs to reserve a length of cabinet height and leather pants + width + m. There is a relaxation coefficient calculated according to the total length of the cable for laying cables along the slot, and there is no coefficient for laying cables along the conduit. The following diagram shows the reserved lengths and descriptions of the cable lengths for various items.

Electrical wiring requires switchgear, measuring instruments, protective appliances and auxiliary equipment to be assembled in enclosed or semi-enclosed metal cabinets or on screens to form a low-voltage power distribution device. During normal operation, the circuit can be switched on or off with the help of manual or automatic switches. In case of failure or abnormal operation, the circuit is cut off with the help of protective appliances, and the balance is held or alarmed.

The usual wire joints are rotten eggplant is connected in this way to ensure that the wire joints do not occur ignition, short circuit, and poor contact.

2.Fireproof tape isolation method, mostly used in the hanging item, or more high-energy projects in the hunger inspection, the main line can not be broken, the rune line around the main line for 6-8 weeks, the spotlight in the ceiling, along the way to have a lot of lights in this way, with fireproof tape wrapped in it, its role is to prevent electric fire to burn things, which is very heavy in the ceiling. The outside is then wrapped with insulating tape.

3.This method is the most standardized and practical, but it needs special tools to do, the crimping pliers to crimp the wire, the special pliers used to press the wire, set on the crimping line, and press it hard. The size of the crimping is related to the number of wires according to the size of the crimped wire warp, and the commonly used is the T4 type, which is a diameter of millimeters, and can press four wires of four square millimeters.

1. The fastening wiring force should be moderate, to prevent the bolts and nuts from slipping with excessive force, and the bolts and nuts that have been slid should be replaced in time, and it is strictly forbidden to operate;

2. When tightening the screws with a screwdriver or loosening the screws, you must force the screws to hold up the screws, and then tighten or loosen them to prevent the screwdriver from slipping and causing damage to the screws, which is not easy to disassemble and assemble, especially the common empty opening in the hanging box;

3. If you find bolts and nuts that are difficult to disassemble, do not act recklessly to prevent deformation and make it more difficult to disassemble, and should be properly beaten, or add screw loosening agent, dilute hydrochloric acid, etc.

4. Do not use vises to tighten or loosen bolts and nuts to prevent damage, and adjust the opening when using a live wrench to prevent the bolts and nuts from being damaged and deformed, resulting in difficult disassembly and assembly;

5. The same terminal is allowed to connect up to two spinal fibrillation wires of the same type and specification.

1. The fastening wiring force should be moderate, to prevent the bolts and nuts from slipping with excessive force, and the bolts and nuts that have been slid should be replaced in time, and it is strictly forbidden to operate;

2. When tightening or loosening the screws with a screwdriver, you must force the screwdriver to hold up the screws, and then tighten or loosen them to prevent the screwdriver from slipping and causing damage to the screws.

3. If you find bolts and nuts that are difficult to disassemble, don't act recklessly, and it is more difficult to disassemble to prevent deformation, so you should give proper beating, or add screw loosening agent, dilute hydrochloric acid, etc.

4. Do not use vises to tighten or loosen bolts and nuts to prevent damage, and adjust the opening when using a live wrench to prevent the bolts and nuts from being damaged and deformed, resulting in difficult disassembly and assembly;

5. The same terminal is allowed to connect up to two wires of the same type and specification.

The basic requirements of the electrical main wiring are eight words: "safe, economical, reliable and flexible";

Specifically, it is:

1. Meet the requirements of electricity consumption;

2. Simple wiring;

3. Economical and reliable operation;

4. Easy to operate and flexible to operate;

5. Reasonable selection of equipment;

6. Easy to maintain and overhaul;

7. Fault handling can ensure safety;

To put it simply, the basic form of electrical main wiring includes: bus wiring and bus wiring

There are busbar wiring including:

1. Single bus wiring (including single bus knife switch segmentation, single bus switch segmentation, single bus with bypass, etc.);

2. Double bus wiring (including double bus knife switch segmentation, double bus switch segmentation, double bus with bypass, etc.);

2 circuit breakers wiring.

3 circuit breakers wiring.

5. Wiring of transformer bus group.

Busbarless wiring includes:

6. Wiring of line transformer group;

7. Bridge wiring (inner bridge, outer bridge, full bridge, etc.).

8. Angular wiring, etc.

Supplement. Cable or sheathed wire. The two joints should be staggered. You cannot have two joints in the same location. The above is the same upstairs.

According to the size of the current, the current is about large, the higher the requirements for the process, 10 ampere, generally more than two centimeters of winding contact surface, soldering if possible. If the connection is made with a large current or power line, it is generally required to connect the contact surface at 8 cm. And soldered, using a layer of ordinary insulating tape plus high-pressure waterproof self-adhesive tape winding.

The wiring contact surface should ensure that the copper surface is bright and oxidation-free.

Electrician wiring process standards.

Several ways to connect wires.

1 Cut the wire insulation.

Wire strippers or wire cutters can be used to exploit the insulation of the wire, or the insulation of the plastic wire can be cut with an electrician's knife. When cutting the insulation layer of plastic hard wire with an electrician knife, the knife edge of the electrician knife is at an angle of 450 to the wire to be cut, cut into the insulation layer obliquely, and then pushed at an angle of 250 degrees. Finally, the cut insulation layer is folded and cut at the root.

Do not cut the core when cutting the insulation.

2. Straight connection and T-shaped branch connection of single-strand copper conductor.

1) Straight connection of single-strand copper core wire First cut out a certain length of wire core from the two wire heads, remove the oxide layer on the surface of the wire core, cross the two wire cores in an X shape, and twist each other 2 3 times, and then pull the straight head. Wrap the straightened wires tightly around each side 6 times, cut off the remaining threads and straighten the ends of the threads.

2) T-shaped branch connection of single-strand copper core wire Intersect the cut core with the trunk core, leave about 3 5mm at the root of the branch core, and then wrap it around the trunk core in a clockwise direction for 6 8 turns, cut off the remaining core with a wire cutter, and clamp the end of the core.

Resources.