关于爬电距离和空气间隙的标准
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Tracking index tester
Working voltage V
<=50 >50 and <= 125 >125 and <=250 >250 and <= 400 >400 and <= 500 >500 and <= 800
Creepage distance mm
Pollution degree
1500 2500
4000
6000
8000
1000
Minimum clearance
mm
0.5 0.5 0.5 0.5 1.5 3.0 5.5 8.0 11.0
The terminals of tubular sheathed heating elements counted 1mm, if the microenvironment is pollution degree 1.
pollution degree 3 applies
Note: The pollution degree should need refer to part 2.
Standard
60335 – 2 – 3 60335 – 2 – 9 60335 – 2 –14 60335 – 2 –15 60335 – 2 – 23 60335 – 2 – 80
>1mm
Tubular sheathed heating element
Pollution degree 1
The minimum clearance is same as the basic insulation
The distance between enclosure and internal wire
The reinforced insulation using the next step for rated impulse voltage.
Between terminal and plastic Fra Baidu biblioteknclosure
Between terminals
The functional insulation is between live parts of different potential
impulse voltage
The clearances of four insulation types:
1. Basic insulation 2. Supplementary insulation 3. Reinforced insulation 4. Functional insulation
Pollution degree
II III III III II III
Tracking index (CTI) values Material group I: 600<=CTI Material group II: 400<=CTI Material group III a: 175 <=CTI <400 Material group III b: 100 <=CTI<175
Hair straighter
Hair straighter assembly
PTC heater
The clearance >=1mm
Kapton film Electrode plate
PTC heating plate
The clearance between surfaces of PTC heating elements may be reduced to 1mm
330 500 800 1500 2500 4000 6000 8000 1000
Minimum clearance mm
0.5 0.5 0.5 0.5 1.5 3.0 5.5 8.0 11.0
Household appliance are in overvoltage category II Select the rated voltage Using the table 1 to find out the rated impulse voltage According to table 2, the minimum clearance could be found by rated
Example 1 : Water kettle Rating : 220 – 240V 50Hz 2500 – 3000W
Rated voltage Rated impulse voltage
V
(V)
Overvoltage category
I
II
III
<=50
330 500 800
>150 and <=150 800 1500 2500
Rated voltage V
<=50 >50 and <=150 >150 and <=300
Rated impulse voltage V
Overvoltage category
I
II
III
330
500
800
800
1500
2500
1500
2500
4000
Rated impulse voltage V
1
2
3
Material group
Material group
I
II
III a/b
I
>150 and <=300 1500 2500 4000
Using category II
220 – 240V
The rated impulse voltage was 2500V
Rated impulse voltage
V
330
500
800
The minimum clearances of basic insulation was 1.5mm
Step 1 (To find out the pollution degree)
Pollution degree 2 applies unless Precautions have been taken to protect the insulation, in which case
pollution 1 applies The insulation is subjected to conductive pollution, in which case
Working voltage V
<=50 >50 and <= 125 >125 and <=250 >250 and <= 400 >400 and <= 500 >500 and <= 800
Creepage distance mm
Pollution degree
1500 2500
4000
6000
8000
1000
Minimum clearance
mm
0.5 0.5 0.5 0.5 1.5 3.0 5.5 8.0 11.0
The terminals of tubular sheathed heating elements counted 1mm, if the microenvironment is pollution degree 1.
pollution degree 3 applies
Note: The pollution degree should need refer to part 2.
Standard
60335 – 2 – 3 60335 – 2 – 9 60335 – 2 –14 60335 – 2 –15 60335 – 2 – 23 60335 – 2 – 80
>1mm
Tubular sheathed heating element
Pollution degree 1
The minimum clearance is same as the basic insulation
The distance between enclosure and internal wire
The reinforced insulation using the next step for rated impulse voltage.
Between terminal and plastic Fra Baidu biblioteknclosure
Between terminals
The functional insulation is between live parts of different potential
impulse voltage
The clearances of four insulation types:
1. Basic insulation 2. Supplementary insulation 3. Reinforced insulation 4. Functional insulation
Pollution degree
II III III III II III
Tracking index (CTI) values Material group I: 600<=CTI Material group II: 400<=CTI Material group III a: 175 <=CTI <400 Material group III b: 100 <=CTI<175
Hair straighter
Hair straighter assembly
PTC heater
The clearance >=1mm
Kapton film Electrode plate
PTC heating plate
The clearance between surfaces of PTC heating elements may be reduced to 1mm
330 500 800 1500 2500 4000 6000 8000 1000
Minimum clearance mm
0.5 0.5 0.5 0.5 1.5 3.0 5.5 8.0 11.0
Household appliance are in overvoltage category II Select the rated voltage Using the table 1 to find out the rated impulse voltage According to table 2, the minimum clearance could be found by rated
Example 1 : Water kettle Rating : 220 – 240V 50Hz 2500 – 3000W
Rated voltage Rated impulse voltage
V
(V)
Overvoltage category
I
II
III
<=50
330 500 800
>150 and <=150 800 1500 2500
Rated voltage V
<=50 >50 and <=150 >150 and <=300
Rated impulse voltage V
Overvoltage category
I
II
III
330
500
800
800
1500
2500
1500
2500
4000
Rated impulse voltage V
1
2
3
Material group
Material group
I
II
III a/b
I
>150 and <=300 1500 2500 4000
Using category II
220 – 240V
The rated impulse voltage was 2500V
Rated impulse voltage
V
330
500
800
The minimum clearances of basic insulation was 1.5mm
Step 1 (To find out the pollution degree)
Pollution degree 2 applies unless Precautions have been taken to protect the insulation, in which case
pollution 1 applies The insulation is subjected to conductive pollution, in which case