Electrical Safety Terms (2)

Electrical Safety Terms 2
1
Basic elements
2.1 Insulation
2.1.1 Insulation (performance)
Insulation (property)
All properties obtained after conductor insulation
2.1.2 Insulation (material)
Insulation
(material)
All materials used to insulate the device.
2.1.3 Insulation structure
Insulation system
A combination of one or more insulating materials. According to the characteristics and size requirements of electrical equipment, it is designed with the conductor part as a whole, used to isolate the conductive part with potential difference.
Note: Several different insulation structures are allowed in one electrical device.
2.1.4 Basic insulation
Basic insulation
Insulation on the live part that provides basic protection against electric shock
2.1.5
Additional insulation
Relief insulation
Separate insulation used in addition to basic insulation to prevent electric shock in the event of basic insulation damage.
2.1.6
Double insulation
Double insulation
At the same time with basic insulation and additional insulation insulation
2.1.7
Reinforced insulation
Reinforced insulation
Equivalent to a single insulation structure with double insulation protection.
2.1.8
Insulation resistance
Insulation resistance
Resistance between two conductors separated by an insulating material under specified conditions.
2.1.9
Dielectric strength
Dielectric strength
The highest electric field strength that the material can withstand without being damaged.
2.1.10
Medium strength experiment
Dielectric test
A specified voltage is applied to the insulation to verify compliance with the short-term test of the circuit's rated insulation voltage as specified by the manufacturer.
2.1.11
Leakage current
Leakage current
In the absence of a fault, current flows into the ground or an external conductive part of the circuit.
Note: This current may include capacitive components due to intentional use of capacitors.
2.1.12
Dielectric loss
Dieiectric loss
The dielectric absorbs power from the time-varying field and dissipates it as heat.
2.1.13
Loss angle (in the case of a sine wave)
Loss angle
(under sinusoidal condition)
Its tangent is the angle of the ratio of the absolute values ​​of active power and reactive power.
2.1.14
Quality factor
Quality factor
The ratio of absolute power to active power of reactive power.
2.1.15
shell
Enclosure
Parts that are protected by the device from some external influence and direct contact in any direction.
2.1.16
protecting mask
Protective cover
To prevent accidental contact with parts of the enclosure or baffles provided by parts that may be dangerous.
2.1.17
Obstruction
Barrier
A component that protects against direct contact in any direction that is often approached.
2.1.18
Barrier
Obstacle
Prevent unintentional direct contact, but do not prevent conscious direct contact with parts.
2.2
spacing
2.2.1
clearance
Clearance
The shortest linear distance between two conductive parts.
2.2.2
Protection gap
Protective gap
Between the live part and ground is used to limit the gap where maximum overvoltage may occur.
2.2.3
Creepage distance
Creepage distance
The shortest distance between the two conductive parts along the surface of the insulating material.
2.2.4
isolation
To isolate
a . Completely disconnect one device or circuit from another device or circuit.
b .
(Using a separate method) provides a prescribed degree of protection to isolate any electrified circuit.
2.2.5
safe distance
Safe distance
In order to prevent the human body from touching or approaching the charged body and from the risk of the vehicle or other object colliding with or approaching the charged body, a certain space distance is required to be maintained therebetween.
2.2.6
Reach range
Arm's reach
From any point on the surface where a person often stands or walks, to the extent to which he can reach the limit in any direction without the need for help.
2.3
Ampacity
2.3.1 (Continuous) Current Carrying Capacity
(continuous) current-carrying capacity (of a conductor)
Under the specified conditions, the conductor can be continuously carried without causing it to stabilize the maximum current exceeding the specified value
2.4
Logo
2.4.1
Safety Signs
Safety marking
Logos made up of safe colors, geometric shapes, graphic symbols, and text to express specific security information.
2.4.2
Supplementary sign
Attached marking
Must be used in conjunction with the safety sign to sign the safety sign.
2.4.3
Safe color
Safety color
The color of the security information, such as prohibition, warnings, instructions, hints, etc.

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