1. Switching and control equipment
The general term for the combination of production equipment, switchgear, and related control, detection, protection, and regulation equipment. It also refers to the combination of these electrical appliances and equipment, as well as their associated internal connecting wires, auxiliary components, casings, and supporting mechanism components.
2 switchgear
The general term for switchgear mainly used for power generation, transmission, distribution, and energy conversion, as well as the combination of these switchgear and related control, detection, protection, and regulation equipment. It also refers to the combination of these electrical appliances and equipment, as well as their associated internal connecting wires, auxiliary components, casings, and supporting mechanism components.
3 Control equipment
The general term for the switchgear mainly used to control the receiving equipment, as well as the combination of these switchgear and related control, detection, protection, and regulation equipment. It also refers to the combination of these electrical appliances and equipment, as well as their associated internal connecting wires, auxiliary components, casings, and supporting mechanism components.
4 Overcurrent
Any current exceeding the rated current.
5 Short circuits
An accidental or intentional connection made through a lower resistance or impedance between two or more points in a circuit that are normally at different voltages.
6 Short circuit current
Overcurrent caused by short circuits due to faults or incorrect connections in the circuit.
7 Overload
Operating conditions that generate overcurrent in normal circuits.
8 Overload current
Overcurrent in circuits that have not been damaged electrically.
9. Surrounding air temperature
Under specified conditions, the temperature of the air surrounding the entire switch or fuse.
Note: For switch appliances or fuses with enclosed enclosures, this temperature refers to the temperature outside the enclosure.
10 conductive parts
The part that can conduct electricity but may not necessarily carry operating current.
11. Exposed conductive parts
Conductive parts that are easily accessible to operators and parts that, although not normally charged, can become charged in the event of a malfunction.
Note: Typical exposed components such as shell walls, operating handles, etc.
12 External conductive parts
The part that is not a component of an electrical device but is prone to introducing a potential (usually ground potential).
13 Live parts
Conductors and conductive parts that are charged during normal use, including neutral conductors, but traditionally do not include protective neutral (PEN) conductors.
Note: This definition does not necessarily include the risk of electric shock.
14 Protective conductor (symbol PE)
To prevent electric shock, certain measures are taken to electrically connect the following components with the required conductors, including:
- Exposed conductive components;
- External conductive components;
- Main grounding terminal;
- Grounding electrode;
- Power grounding point or manually grounded neutral point.
15 neutral conductor (symbol N)
A conductor connected to the neutral point of the system and capable of transmitting electrical energy.
Note: In some cases, the functions of neutral conductors and protective conductors can be combined under specified conditions, and this conductor is called a PEN conductor (symbol PEN).
16 casing
Can provide a specified level of protection to prevent certain external influences and to prevent approaching or touching live and moving parts of components.
Note: This definition is similar to the definition IEV 441-13-01 applicable to complete electrical appliances.
17 Overall shell
The shell that forms part of the device.
18 (Category of Use for Switching Appliances or Fuses)
A combination of specified requirements related to the working conditions under which switching devices or fuses are used for their intended purpose. Its requirements are selected from a group of characteristics that represent the actual use.
Note: The specified requirements include: making capacity (if applicable), breaking capacity, other characteristics, connected circuits, and relevant usage conditions and performance.
19 Isolation (Isolation Function)
For safety reasons, the function of cutting off the power supply of a part or the entire electrical appliance is achieved by separating it from the power supply.
20 electric shocks
The pathological and physiological effects generated when electric current passes through human or animal bodies.