What Is a Cord Circuit?

A wire is a wire that transmits electrical energy. Divided into bare wires, electromagnetic wires and insulated wires. Bare wires have no insulation, including copper, aluminum flat wires, overhead stranded wires, and various profiles (such as profile wires, bus bars, copper bars, aluminum bars, etc.). It is mainly used for outdoor overhead and indoor busbars and switch boxes. Electromagnetic wire is an insulated wire that generates a magnetic field after being energized or induces a current in the magnetic field. It is mainly used in motor and transformer windings and other related electromagnetic equipment. The conductor is mainly copper wire, and it should have a thin insulation layer and good electrical and mechanical properties, as well as heat resistance, moisture resistance, and solvent resistance. Different characteristics can be obtained by using different insulating materials.

A wire is a wire that transmits electrical energy. Divided into bare wires, electromagnetic wires and insulated wires. Bare wires have no insulation layer, including copper, aluminum flat wires, overhead stranded wires, and various profiles (such as profile wires, bus bars, copper bars, aluminum bars, etc.). It is mainly used for outdoor overhead and indoor busbars and switch boxes.

Electromagnetic wire is an insulated wire that generates a magnetic field after being energized or induces a current in the magnetic field. It is mainly used in motor and transformer windings and other related electromagnetic equipment. The conductor is mainly copper wire, and it should have a thin insulation layer and good electrical and mechanical properties, as well as heat resistance, moisture resistance, and solvent resistance. Different characteristics can be obtained by using different insulating materials.

There are two types of electromagnetic wires: enameled wire and wound wire. Enameled wire is made by coating insulating varnish on bare copper wire. The insulation layer is thin and takes up a small volume. It is widely used in various electrical appliances and instruments. The properties of the enameled wire vary according to the nature of the insulating material used. Wrapped wires mainly include yarn covered wire, silk covered wire, glass fiber covered wire, paper covered wire and plastic film covered wire, etc. Among them, yarn covered wire and silk covered wire may be eliminated due to poor temperature resistance and large occupied volume. Glass-fiber covered wire is wrapped around a round copper wire and impregnated with a silicone resin. It can withstand temperatures up to 180 ° C and has good insulation and mechanical strength. Paper covered wire is mainly used for oil-immersed transformers. Plastic film covered wire is made of polyimide film coated with an adhesive and wrapped around a conductor and fused. Its insulating layer is tough and elastic, easy to wind, wear-resistant and heat-resistant, and is widely used in space navigation and other equipment. Insulated wires generally consist of a conductive wire core, an insulating layer, and a protective layer. The core can be divided into four types: hard, soft, mobile and extra soft. There are four types of cores: single core, two core, three core and four core. The insulating layer is generally made of rubber or plastic. This type of insulated wire is widely used in various instruments, telecommunications equipment, power lines and lighting lines with AC voltage below 500 volts and DC voltage below 1,000 volts.

Wires and cables consist of conductors,

• Start with copper slag, not necessarily

  The composition and sequence of the cable types are as follows :

  [1: Category, application] [2: Conductor] [3: Insulation] [4: Inner sheath] [5: Structural features] [6: Outer sheath or derivative]-[7: Using characteristics

  Black, white, green, red, blue, orange, brown, and gray. The color of the insulation sheath on the outside of the wire usually has its own meaning. So, when working with new fixtures, in addition to turning off the circuit breaker, you must also determine what each colored wire you will encounter next means.

  Residents in the United States did not have a systematic color coding for electricity at first, and they did not even have a set of standards for correct use. In 1879, shortly after Edison first introduced electric lights, the insurance industry began issuing safety guidelines. The first set of formal guidelines appeared in 1881 and included addressing capacity, insulation, and installation. There is no classification of wire colors.

  In 1882, the National Fire Underwriters Committee (NBFU) also adopted early safety regulations. In 1893, the National Insurance and Electricity Association began to try to unify the different electrical installation codes and specifications of each state, and proposed a national coding standard for electric lights and power supply units for wiring buildings.

  The first National Electrical Code (NEC) was proposed by NBFU in 1897, and it also ignored the standardization of wire color issues. Later, in 1928, the NEC was updated and revised. One of the requirements was to establish a standard for the color of the ground wire, which was later white or natural gray. It was also forbidden to apply these colors to live lines and neutral lines.

  Further color coding is a new version launched by NEC in 1937, which uses color-coded wires with "multi-branch circuits", and stipulates that the wires of three-branch circuits should be black, red, and white. More branches can be added in other colors, such as yellow and blue.

  In 1953, NEC changed the color of the ground wire to green or bare wires. Green is also forbidden for circuit wires (such as live and neutral wires).

  NEC's 1971 version encodes multi-lane runs. Although white, natural gray, green, and yellow-green stripes are still retained, these colors are also prohibited from being used for ground wires. This time the specifications for the stereotyped color code of the access wires were dropped because there were not enough colors to distinguish the system, voltage, and circuit.

  A few days ago in the United States, the ground wire was green, yellow-green stripes, or bare wires. The neutral wire should be white or gray, and the circuit wires might be black, red, blue, yellow, orange, or yellow, depending on the voltage.

  These color standards are U.S. and other country codes are different (Canada's is very similar to the U.S.). For example, Australia, New Zealand, and the United States have the same ground wire, and their neutral wires are blue or black. Moreover, live wires can be used in any color other than ground and neutral. Red and brown are the recommended colors for single-phase wires, and red, white, and blue are the recommended colors for multi-phase current charged wires.

  The latest (2004) in the UK has changed the system for complying with the International Electrotechnical Commission (EC). Their ground wire color (yellow-green stripes) remained the same, and the neutral line color changed from black to blue. Similarly, single-phase wires were previously red but turned brown. In addition, the marking and coloring of multiphase circuits in the UK has also changed: L1 changes from red to brown, L2 changes from yellow to black, and L3 changes from blue to gray.

  The meaning of the pinyin letters in the product model (without brackets)

  A: (Poly) amine (fat), safety (installation), aluminum plastic sheath (Alpeth)

  B: flat, half, weaving (weaving), pump, cloth, (poly) benzene (vinyl), glass (glass fiber), patch, parallel

  C: car, alcohol, mining (excavator), porcelain, heavy (type), marine, electricity storage (pool), magnetic charging, compensation, (yellow wax) silk, (three) vinegar (acid film), self-supporting

  D: belt, (not) drip (flow), lamp, electricity, (cold) freezing (ie cold-resistant), Ding (base rubber), plating

  E: Two (layer), field (outside), symmetrical structure (codename), B (C rubber) (EPR)

  F: (polytetrafluoro) (ethylene), divided (phase), non (flammable), fly (machine), foamed polyethylene (YF)

  G: steel, trench, modified (paint), pipe, high (pressure)

  H: (metal), ring (oxygen paint), welding, flower, communication cable (use code), H (H type, that is, split-phase shield structure), cold

  J: Twisting, plus (strong), plus (thick), saw, round (used)

  K: (True) Empty, Card (Pullon), Control, Armored, Hollow.

  L: Aluminum, furnace, wax (gram), bitumen (green), (protection) lightning, phosphorus

  M: Cotton (yarn), linen, female (thread), cap, film

  N: (self) stickiness (sex), peat (charcoal), (high resistance) Ni (wire core), Ni (dragon), fire resistance

  O: coaxial (structure code)

  P: Row, (core) screen (shield), distribution (wire), lean (pan-impregnation, dry insulation), signal cable (use code)

  Q: Pull (lead car), paint, lead, light (type), gas, steam (vehicle), high (strength polyvinyl acetal)

  R: soft, human (made) silk, daily use (use code), (resistant) heat (chemical).

  S: brush, wire, radio frequency (use code), double, steel plastic sheath (Stalpeth), low smoke halogen free flame retardant sheath

  T: copper, ladder, special, pass, pottery, elevator, exploration

  U: mineral, cotton (referring to asbestos), mining (use code)

  V: (P) V (C) (polyvinyl chloride)

  W: (Earth) physical (physical), wrinkle sheath, non (magnetic), (high temperature) resistance, (field) outside, petroleum (use code)

  X: rubber (force cable), polyamide, rubber (leather insulation)

  Y: hard, garden, oil, oxygen, (resistant) oil, mobile (use code), polyethylene, pressure

  Z: (Polyester), Paper, (Electric) Drill, Medium, Heald

  YJ: XLPE insulation

  P2: copper tape shield

  ZRK: series code, which means flame-retardant control cable

  1. Select copper core wire: wire and wire, first of all, to good conductivity. There are copper core wires and other wires on the market. Copper core wire is the most practical one for interior decoration. However, copper core wires are divided into several types, including large radius copper cores and multi-wire copper cores.

  2. High-capacity power cables: The electricity consumption in the home is large and small. At the maximum, we will turn on the TV, air conditioner, computer, light, water dispenser, refrigerator, hair dryer, etc. If the load capacity of the wire is not strong, and hot summer, it will easily cause the wire to burn due to high temperature, resulting in fire.

  3. Good waterproof performance. The appearance of some wires is easily deformed and cracks. In the event of water leakage somewhere, it will cause electrical burnout, short circuit and even fire and casualties. Therefore, it is necessary to have a hard outer sheath and good waterproof performance.

  4, the main line must be thick core. The so-called main line refers to the two main lines from the main power supply to all electrical appliances. The main wire ratio must use a thick copper core wire, because the main wire carries the amount of electrical charge of each electrical appliance, and requires a thick copper wire with excellent performance. Multi-core can be selected as the bypass.

  In the daily production and household wire process, damage such as short circuit, burnout, and aging often occur. Then, by those means, it can effectively prevent the damage of the wire insulation and better protect the normal operation of wire and cable performance. The following are three emergency measures to be taken daily in the event of damage to the insulation of the wire. ^[3]

  (1) The current through the wire should not exceed the safe ampacity of the wire;

  (2) Do not allow the wire to get wet, heat, corrode or be injured or crushed. As far as possible, do not allow the wire to pass through places with high temperature, high humidity, corrosive vapors and gases. The wire should be properly protected where it passes ;

  (3) Regularly inspect and repair the circuit. If there are any defects, repair them immediately. The old wires must be replaced in time to ensure the safe operation of the circuits.