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| Arc Flash Labels above 40 cal/cm^2 https://brainfiller.com/arcflashforum/viewtopic.php?f=33&t=3694 |
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| Author: | Jim Phillips (brainfiller) [ Sun May 10, 2015 11:50 am ] |
| Post subject: | Arc Flash Labels above 40 cal/cm^2 |
This week's question once again refers to the informational note found in NFPA 70E that states: 130.7 Informational Note No. 3: When incident energy exceeds 40 cal/cm^2 at the working distance, greater emphasis may be necessary with respect to de-energizing before working within the limited approach boundary of the exposed electrical conductors or circuit parts. Where the calculated incident energy exceeds the 40 cal/cm^2 limit from Informational Note 3, many arc flash labels use a Red background with white "Danger" as the signal word. However many of these labels also have language that states: "No Safe PPE Available" or something similar even though PPE is available with arc ratings upwards of 100 cal/cm^2. The concern continues to be two things, the perceived thought of blast pressure and legal aspects of a standard containing a reference to 40 cal/cm^2 in this context even though it is an informational note. Here is this week's question: ' For locations > 40 cal/cm^2, which of the following are on your/client's label Danger No Safe PPE Exists Energized work prohibited None of these Something else We don't have locations > 40 cal/cm^2 Select up to THREE options. |
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