I've been working with NFPA 70E now for about 10 years and have performed a number of studies with some being large hospitals, industrial plants and now an airport. I have a number of comments and would like to send you one or two text documents.
My biggest concern with NFPA70E is Table 130.7(C)(9)(a) Hazardous Risk Category Classification. This table should be deleted from the standard since most people don't read or understand the notes at the bottom of the table. The table is based upon very short OCD clearing times. There is not way anyone can look at a system and make a judgement as to how fast OCDs will trip. Thus the table can place people in real danger.
Next, it is important to understand that current limiting fuses will not reduce the arc flash hazard unless the arc fault in within the current limiting range of the fuse. I have a technical paper I can send you which illustrates this fact. The paper may be a little out of date so I may need to do some updating before i send it.
Please let me know where to send text documents. John Pfeiffer
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I’m getting ready to start working on a textbook “Understanding Electrical Safety in the Workplace – NFPA 70E” and I need some help identifying those sections of this Standard that are most important for the Electrical Contractor/Installer. If you are familiar with this standard, could you email me a list of Sections that you feel I should cover?
