Dave, Brian, Electrical field inspectors commonly require that labels of the type I referenced be installed by the manufacturer. The detailed labels with the arc flash degree and the details on the PPE requirements can only be installed post installation and post arc-flash hazard analysis. This is a workplace requirement, and not a manufacturer requirement.
Dave is correct about the Short-Circuit Withstand Rating (SCCR). This has been part of the nameplate requirements for many years. Doug On 24-Nov-14, at 16:10, Nyffenegger, Dave <[email protected]> wrote: > Over the years recently there has been more emphasis on arc flash due to > injuries. You can search on it. The issue is the potential for arc flash > when the control panels are open and powered by the electrician which can > cause clothing to catch fire. It's not so much an issue of containing an arc > flash within the enclosure, a fire enclosure should do this regardless. > > I asked our NRTL test engineer about arc flash warning label requirements a > few months ago and he pointed out that wording in NFPA 70 states that arc > flash warning labels are to be applied on site during machine installation. > There is not a requirement for the manufacturer to apply the warning. I > don't have my copy of NFPA 70 in front of me but I recall I confirmed the > wording. I recall I also confirmed the same on the OSHA web site. These > labels can be purchased off the shelf. > > NFPA-79: Sec. 16.4 requires the SCCR of electrical control panels to be put > on the product nameplate. UL 508A: Supplement SB has instructions for > determining SCCR. If your product doesn't contain an electrical control > panel and no internal branch circuits you may not need the rating. > > I've only had an NRTL certify to NFPA 79 for field labeling/marking. > > -Dave > > -----Original Message----- > From: Kunde, Brian [mailto:[email protected]] > Sent: Monday, November 24, 2014 3:29 PM > To: [email protected] > Subject: [PSES] Arc Flash Requirements NFPA 79 > > Our company produces Laboratory Equipment. We design to the IEC/EN/UL 61010-1 > series of standards and the NFPA 70 NEC. > > Some of our instruments can be quite large; slightly bigger than an upright > piano. They typically are powered by 230VAC, 20A to 50A branch circuits. It > is typical that our instruments are installed near or in a heavy industrial > environment even though they are not considered Industrial Machines. They are > sometimes mistaken as Industrial Machines. > > Recently, we have had customers ask the following questions about our > instruments: > > * Proof that the electrical system complies to NFPA 79. > * Are the electrical enclosures marked for arc flash hazard per NFPA 79? > * What is the Short Circuit Current Rating (SCCR) of our instruments? > > > Typically we simply reply that our instruments are not Industrial Machines > and that is that. However, if there is information we can provide that would > be helpful, we would like to do so. > > I can see where our customer may wish to power our instrument from a circuit > that is capable of producing very high short circuit current (SCC). If this > exceeds the 5kA rating of our internal Supplementary Protection Device, then > our customer would have to supply a Brach Circuit Breaker that can handle the > SCC. > > High SCC can also cause a concern for Arc Flash. I do not know the > requirements of NFPA 79 and how it affects Arc Flash. For instance, since > our chassis meets the mechanical requirements called out in IEC 61010-1, is > it likely that our chasses will contain the arc flash hazards? > > Is there any part of NFPA 79 that could apply to our instruments; to the > mechanical or electrical system? > > Has something changed recently which would explain why we are now receiving > these type of questions? > > Thanks for any input or advice. > > The Other Brian > > > > > ________________________________ > > LECO Corporation Notice: This communication may contain confidential > information intended for the named recipient(s) only. If you received this by > mistake, please destroy it and notify us of the error. Thank you. > > - > ---------------------------------------------------------------- > This message is from the IEEE Product Safety Engineering Society emc-pstc > discussion list. To post a message to the list, send your e-mail to > <[email protected]> > > All emc-pstc postings are archived and searchable on the web at: > http://www.ieee-pses.org/emc-pstc.html > > Attachments are not permitted but the IEEE PSES Online Communities site at > http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used > formats), large files, etc. > > Website: http://www.ieee-pses.org/ > Instructions: http://www.ieee-pses.org/list.html (including how to > unsubscribe) List rules: http://www.ieee-pses.org/listrules.html > > For help, send mail to the list administrators: > Scott Douglas <[email protected]> > Mike Cantwell <[email protected]> > > For policy questions, send mail to: > Jim Bacher: <[email protected]> > David Heald: <[email protected]> > > - > ---------------------------------------------------------------- > This message is from the IEEE Product Safety Engineering Society emc-pstc > discussion list. To post a message to the list, send your e-mail to > <[email protected]> > > All emc-pstc postings are archived and searchable on the web at: > http://www.ieee-pses.org/emc-pstc.html > > Attachments are not permitted but the IEEE PSES Online Communities site at > http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used > formats), large files, etc. > > Website: http://www.ieee-pses.org/ > Instructions: http://www.ieee-pses.org/list.html (including how to > unsubscribe) > List rules: http://www.ieee-pses.org/listrules.html > > For help, send mail to the list administrators: > Scott Douglas <[email protected]> > Mike Cantwell <[email protected]> > > For policy questions, send mail to: > Jim Bacher: <[email protected]> > David Heald: <[email protected]> - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]>
