Electrician knowledge

The following data can be used as a basis for measuring the quality of sockets.

1, the copper sheet of the socket must be made of phosphor bronze, and it must have certain elasticity. Generally, the thickness of the copper sheet should reach more than 0.3 mm, and the thickness of the copper sheet of the air-conditioning socket should reach 0.6 mm to ensure its safety and reliability in use.

2. The socket and plug are well matched, and the tightness is appropriate, and the plugging and unplugging is easy and natural. The pull-out force of three-pole socket plug is about 3.5KG (measured by test gauge), and that of two-pole socket plug is about 3KG. Sockets with protective doors are not allowed to be too tight and stuck when inserting plugs. In this way, a good anastomosis can be maintained permanently.

3, the appearance mainly depends on the fine processing, luster, convenient disassembly, novel style, streamlined chamfering and ultra-thin, which can be used as a reference for selection.

High-quality switches generally adopt high-quality anti-fatigue springs, pure silver contacts, silver-copper composite conductive materials, and the rocker has good linear performance and resistance to arc oxidation (lead and zinc are used as contacts for inferior products). Switches with silver contacts have good conductivity and rarely appear arcing.

The plastic on the back of high-quality socket is flame retardant and has good insulation and mechanical properties. The socket spring sheet is made of advanced tin-phosphorus bronze sheet, which has long elasticity, stable force, uniform plugging and unplugging force, smooth plugging and unplugging and small resistance. The copper sheet of 16A socket is generally more than 0.6 mm, which will not cause the copper sheet to overheat and burn the socket surface due to the change of resistance. When installing an audio socket, it is recommended to use an American three-plug (because the audio amplifier has instantaneous current).

High-quality switch products generally pass the Great Wall Certification of China Electrotechnical Product Certification Committee, the International Electrotechnical Commission Certification and the British National Standard Certification. China standard (GB), International Electrotechnical Commission (IEC), British standard (BS) and German standard (VDE).

Electrical symbol meaning

0 1, what does the distribution box AL/PL mean in the electrical construction drawing?

In the electrical construction drawing, al stands for lighting distribution box; AP stands for distribution box. In GB 7 159 "General Rules for Representation of Characters and Symbols in Electrical Technology", A stands for components or parts, and L and P have nothing to do with GB 7 159, which is a restriction on A, L-light; P-power (power) X stands for terminal, plug, socket, etc. The meaning of XM can only be determined by drawing. Distribution boxes are generally not represented by PL. AW is the meter box, AL is the lighting box, ALE is the emergency lighting box, AP is the distribution box, and APE is the emergency power box.

02. Name of electrical construction drawing of distribution box

Generally speaking, ALE is an emergency lighting distribution box with dual power supply; AP is a power distribution cabinet, mostly single power supply and sometimes double power supply, but it does not participate in fire fighting linkage; AL is an ordinary lighting distribution cabinet with single power supply; APE is an emergency distribution box, which is connected with dual power supplies and participates in fire fighting linkage;

Like ALR, APS, CZX, HX, etc. According to the function of the room or controlled equipment, they are designed to use the first letter abbreviation of Chinese Pinyin. For the convenience of numbering, it may be ALR, heat, APS, blower; CZX, socket box; HX, household boxes, etc. Because many Chinese characters have the same birth mother, they can be compared according to the location of distribution box or controlled equipment.

03, the meaning of symbols in the circuit construction drawing

C65n-d/3p20alc1-d25lr2-d1312 ~18yc-4 * 6p32-fc in the distribution box system diagram.

What does L 123/WP 1 mean?

C65N-D/3P: Small circuit breaker, C65 should be Siemens model, 3P is 3 poles;

20ALC 1-D25: a new type of AC contactor

LR2-D 13: thermal relay

YC-4*6 P32-FC: Cable specification, model and laying method.