EN60335关于爬电距离和空气间隙的标准

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EN60335关于爬电距离和空气间隙的 标准
29.1.1 clearances of basic insulation
•The minimum clearances of basic insulation was 1.5mm
Rated impulse voltage V
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
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EN60335关于爬电距离和空气间隙的 标准
Special components for basic insulation
➢ The terminals of tubular sheathed heating elements counted 1mm, if the microenvironment is pollution degree 1.
0.5
800
0.5
1500
0.5
2500
1.5
4000
3.0
6000
5.5
8000
8.0
1000
11.0
EN60335关于爬电距离和空气间隙的 标准
How to find the minimum clearance
➢ 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
•The distance between enclosure and internal wire
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EN60335关于爬电距离和空气间隙的 标准
29.1.3 clearance of reinforced insulation •The reinforced insulation using the next step for rated impulse
•>1mm
•Tubular sheathed heating element
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•Pollution degree 1
EN60335关于爬电距离和空气间隙的 标准
29.1.2 clearance of supplement insulation
•The minimum clearance is same as the basic insulation
EN60335关于爬电距离 和空气间隙的标准
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2020/10/30
EN60335关于爬电距离和空气间隙的 标准
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Minimum clearance (Table 2)
Rated impulse voltage V
Minimum clearance mm
330
0.5
500
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EN60335关于爬电距离和空气间隙的 标准
Internal construction of PTC heating element
•The clearance >=1mm
•Kapton film •Electrode plate
•PTC heating plate
•The clearance between surfaces of PTC heating elements may be reduced to 1mm
V
(V)
Overvoltage category
I
II
III
<=50
330 500 800
>150 and <=150 800 1500 2500
•Using category II
>150 and <=300 1500 2500 4000
•220 – 240V
•The rated impulse voltage was 2500V
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EN60335关于爬电距离和空气间隙的 标准
The clearance of basic insulation
•Example 1 : Water kettle •Rating : 220 – 240V 50Hz 2500 – 3000W
Rated voltage Rated impulse voltage
voltage.
•Between terminal and plastic enclosure
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EN60335关于爬电距离和空气间隙的 标准
29.1.4 clearance of functional insulation
•Between terminals
•The functional insulation is between live parts of different potential
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EN60335关于爬电距离和空气间隙的 标准
PTC Heating element
•Hair straighter
•Hair straighter assembly
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•PTC heater
EN60335关于爬电距离和空气间隙的 标准
Different types of PTC Heating elements
impulse voltage
The clearances of four insulation types:
1. Basic insulation 2. Supplementary insulation 3. Reinforced insulation 4. Functional insulation
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EN60335关于爬电距离和空气间隙的 标准
29.2 creepage distances
• 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