The electrical practice exam is divided into four parts:

1, basic operation: lighting, electric energy meter, leakage protector, transformer, AC contactor control, low-voltage power supply and other wiring.

2. Identification and judgment: names, usage methods and quality identification of electrical materials, electrical instruments, electrical symbols, safety appliances, signs and fire-fighting equipment.

3. Electric shock first aid: first aid steps, key points and cardiopulmonary resuscitation.

4. Find hidden dangers: find out the hidden dangers that violate the regulations in the installed electrical lines and electrical facilities.

Electrician common sense:

1. Before decoration, there must be (strong current and weak current) construction drawings, and electrical engineering completion drawings shall be provided upon completion.

2, electrical installation construction personnel should hold relevant certificates.

3, wiring should be color separation, phase line (L) color should be unified, zero line (N) should be black, protection line (PE) must be yellow and green.

4, plastic wire protection tube and junction box appearance should not be damaged and deformed.

5. Generally, the pipes are 4 branches (DN 15) and 6 branches (DN20). The wall thickness of smooth pipes is 2 .0 0.3mm, and there are no more than 4 threads.