CSE Pure Power - Summer 2008 - (Page 33)

33 ❮❮ PURE POWER // SUMMER 2008 In the past, there was no guidance for this type of electrical equipment. The committee recommended removing Table 130.7(C)(10), the Hazard/Risk Category minus 1 (HRC -1). The committee found few people using it and the designation caused confusion. A new column, HRC 2* will take its place. HRC 1 will now require the use of an arc-rated face shield at a 4 cal/cm2 minimum. The format of the table has been changed so that each Hazard/Risk Category is now in its own box, across in rows, instead of columns. The new tables, if approved by the TCC, will have a separate column for HRC 2*, which will give all the PPE and arc ﬂash protective equipment needed for this level. The use of a balaclava hood, which is the ﬂameresistant (FR) sock hood used by various motor sports, is allowed for use in the HRC 2*. This provides an additional level of protection to the face and neck area, while protecting the back of the head, which the arcrated face shield does not provide. A full arc ﬂash hood is still applicable and, based on certain circumstances, could be preferable to the use of the balaclava hood. The committee changed the FR requirements to arc-rated because of the unsuitable garments that have an FR rating or designation. In Table 130.7(C)(11), the typical clothing systems were revised to concentrate on the arc rating rather than the number of layers so newer technologies can be applied to arc ﬂash protective clothing systems. One of the biggest possible changes, provided it passes TCC, is the elimination of Chapter 4, which acts as an abridging of the NEC. In the past, the 70E and NEC were in the same cycle, so the material that made up Chapter 4 was from the previous NEC, rather than the newest. Corrected for this cycle, the consensus of committee members felt that Chapter 4 resulted in a higher number of issues, rather solving them. All of the above changes are not set in stone. The standards process is in play until the TCC makes a ﬁnal determination on the proposals. ABOUT THE AUTHOR White is Training Director with Shermco Industries, Dallas. For more info, enter #413 on the Reader Service Card www.purepowermagazine.com http://www.selindustrial.com/pp2 http://www.selinc.com http://www.selinc.com http://www.selindustrial.com http://www.purepowermagazine.com

Table of Contents Feed for the Digital Edition of CSE Pure Power - Summer 2008

CSE Pure Power - Summer 2008 Contents In the News Industry Roundup Risk Assessments for COPS Grounding Requires More Power Systems to Protect Healthcare Important Changes Coming in NFPA 70E A Look at Arc-Resistant Switchgear Agencies and Associations New Products Ad Index

CSE Pure Power - Summer 2008

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