With temperatures reaching 35,000°F, exposure to the extreme heat of an arc flash can result in life-threatening 伯恩斯. Most fatalities occur because the clothing continues to burn after the arc exposure.
ARC Flash temperatures reach 35,000°F.
Flame-resistant clothing will self‐extinguish, thus limiting the injury. ARC-rated performance values are assigned to clothing under 美国 70E, ensuring you know what you’re purchasing. When you’re up against arc flashes and blast hazards, you don’t want to take any chances with unproven 个人防护用品. Before we go any further, t在这里 are several definitions that need to be 解释.
电弧闪光危险标志
美国 70E stresses an Arc-Rated Category (ARC) level of arc flash protective clothing that must be worn to guard against a minimum level of energy (calories) released from an electrical explosion. Below is a table identifying the four ARC Flash 个人防护用品 Levels:
危险类别 | 衣服的描述 | Minimum Arc Rating (cal/cm2) |
---|---|---|
0 | Non-melting flammable materials | N/A |
1 | Arc rated FR Shirt and FR的裤子 or FR Coverall | 4 |
2 | Arc rated FR Shirt and FR的裤子 or FR Coverall | 8 |
3 | Arc rated FR Shirt and FR的裤子 or FR Coverall, and arc flash suit selected so that the system arc rating meets the required minimum | 25 |
4 | Arc rated FR Shirt and FR的裤子 or FR Coverall, and arc flash suit selected so that the system arc rating meets the required minimum | 40 |
The ARC ratings include five risk levels, which range from 0 to 4. Level 0 means t在这里 is no risk of melting materials (N/A), w在这里as, level 4 is an extreme risk. A 危险类别 Level (HRC) level, now referenced as 个人防护用品 level, is determined by the minimum amount of calories per square centimeter (ATPV or Cal/cm2).
更多关于70E 在这里
It is imperative that an arc flash hazard analysis be performed by safety personnel before selecting 个人防护用品 styles. 这 can be accomplished in one of two ways:
Anytime you see a sign like this, proper ARC rated 个人防护用品 must be worn.
For additional information on 70E, explore more 在这里.
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