Test for second characteristic numeral 7: temporary immersion between 0,15 m and 1 m
The test is made by completely immersing the enclosure in water in its service position as specified by the manufacturer so that the following conditions are satisfied:
a) the lowest point of enclosures with a height less than 850 mm is located 1 000 mm below the surface of the water;
b) the highest point of enclosures with a height equal to or greater than 850 mm is located 150 mm below the surface of the water;
c) the duration of the test is 30 min;
d) the water temperature does not differ from that of the equipment by more than 5 K.
However, a modified requirement may be specified in the relevant product standard if the tests are to be made when the equipment is energized and/or its parts in motion.
2014年11月11日 星期二
2014年11月10日 星期一
防護試驗 - IPX6
Test for second characteristic numeral 6 with the 12,5 mm nozzle
The test is made by spraying the enclosure from all practicable directions with a stream of water from a standard test nozzle as shown in figure 6.
The conditions to be observed are as follows:
– internal diameter of the nozzle: 12,5 mm;
– delivery rate: 100 l/min ± 5 %;
– water pressure: to be adjusted to achieve the specified delivery rate;
– core of the substantial stream: circle of approximately 120 mm diameter at 2,5 m distance from nozzle;
– test duration per square metre of enclosure surface area likely to be sprayed: 1 min;
– minimum test duration: 3 min;
– distance from nozzle to enclosure surface: between 2,5 m and 3 m.
The test is made by spraying the enclosure from all practicable directions with a stream of water from a standard test nozzle as shown in figure 6.
The conditions to be observed are as follows:
– internal diameter of the nozzle: 12,5 mm;
– delivery rate: 100 l/min ± 5 %;
– water pressure: to be adjusted to achieve the specified delivery rate;
– core of the substantial stream: circle of approximately 120 mm diameter at 2,5 m distance from nozzle;
– test duration per square metre of enclosure surface area likely to be sprayed: 1 min;
– minimum test duration: 3 min;
– distance from nozzle to enclosure surface: between 2,5 m and 3 m.
防護試驗 - IPX4
Test for second characteristic numeral 4 with oscillating tube or spray nozzle
The test is made using one of the two test devices described in figure 4 and in figure 5 in accordance with the relevant product standard.
Conditions when using the test device as in figure 4 (oscillating tube):
The oscillating tube has spray holes over the whole 180” of the semicircle. The total flow rate is adjusted as specified in table 9 and is measured with a flow meter.
The tube is caused to oscillate through an angle of almost 360°, 180° on either side of the vertical, the time for one complete oscillation (2 × 360°) being about 12 s.
The duration of the test is 10 min.
If not specified otherwise in the relevant product standard, the support for the enclosure under test is perforated so as to avoid acting as a baffle and the enclosure is sprayed from every direction by oscillating the tube to the limit of its travel in each direction.
The test is made using one of the two test devices described in figure 4 and in figure 5 in accordance with the relevant product standard.
Conditions when using the test device as in figure 4 (oscillating tube):
The oscillating tube has spray holes over the whole 180” of the semicircle. The total flow rate is adjusted as specified in table 9 and is measured with a flow meter.
The tube is caused to oscillate through an angle of almost 360°, 180° on either side of the vertical, the time for one complete oscillation (2 × 360°) being about 12 s.
The duration of the test is 10 min.
If not specified otherwise in the relevant product standard, the support for the enclosure under test is perforated so as to avoid acting as a baffle and the enclosure is sprayed from every direction by oscillating the tube to the limit of its travel in each direction.
2013年9月5日 星期四
防護試驗 - 降雨量概論
降雨量 ( rainfall )
降雨量是衡量一個地區降水多少的數據，其單位是毫米，符號是mm。
降水量測量是一般是用口徑20cm的漏斗收集，用專門的雨量計測出降水的毫米數。
如果測的是雪、雹等特殊形式的降水，則一般將其溶化成水再進行測量。
若將降雨量乘上降雨範圍面積大小（一般以平方公里，即km2表示），可獲得總降雨體積。
防護試驗 - NEMA
NEMA 205 vs IEC-60529
NEMA1 通用型（室内）
NEMA2 防滴型（室内）NEMA3 防雨、防尘、（室外）
NEMA4 防雨、防尘（室内/外） EMA4X 防雨、防尘、防腐（室内/外）
NEMA6 水下、防尘、防水（室内/外）NEMA7 防爆1区
NEMA8 防爆1区NEMA9 防爆2区
NEMA10 矿用NEMA11 防腐、防滴（室内）
NEMA12 工业用防腐、防滴（室内）NEMA13 防油、防尘（室内） NEMA13R 防雨、冻雨（室外）
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