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| Please support this Proposal https://brainfiller.com/arcflashforum/viewtopic.php?f=16&t=194 |
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| Author: | JoeTedesco [ Sat Aug 30, 2008 5:50 am ] |
| Post subject: | Please support this Proposal |
[url="http://submissions.nfpa.org/onlinesub/onsubmain.php"]NFPA ACCEPTS PROPOSALS ONLINE[/url] Log Number: 586 Section/Paragraph: 110.16 - Proposal for the 2011 NEC Submitter: Joe Tedesco, Boston, MA Recommendation: Delete the following words: [color="Red"]"that are in other than dwelling occupancies," [/color]so that the text in the 2011 NEC will read as follows: 110.16 Flash Protection. Electrical equipment, such as switchboards, panelboards, industrial control panels, meter socket enclosures, and motor control centers, that are likely to require examination, adjustment, servicing, or maintenance while energized shall be field marked to warn qualified persons of potential electric arc flash hazards. The marking shall be located so as to be clearly visible to qualified persons before examination, adjustment, servicing, or maintenance of the equipment. Substantiation: I live in a nine story building that is supplied by a 1000 amp, 208Y/120 volt, 3 phase 4 wire service, that includes electrical switchboards, panelboards, industrial control panels, meter socket enclosures, and motor control centers, that often require examination, adjustment, servicing, or maintenance while energized. Each dwelling unit is supplied by a 125 amp feeder, and has a panelboard installed in a clothes closet. The building was built before the code added the rule in 240.24(D). Adding a field marking to warn qualified persons of potential electric arc flash hazards where it will be clearly visible to qualified persons before examination, adjustment, servicing, or maintenance of the equipment will enhance safety. See this video and audio of the equipment room in my building: http://www.youtube.com/watch?v=HKjAmaH6xxk# |
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| Author: | K. Jackson [ Sun Aug 31, 2008 9:03 am ] |
| Post subject: | |
I understand the concern with your building's large service but isn't this over reaching into single family dwellings with small individual services? Perhaps some language about this applying to a service above a certain size like maybe 600 Amps? << just randomly picked that number, some thought could be put into what is a good size service. Maybe make it not applicible to residental services below some number. Maybe it just applies to multi tenent dwellings. I would hate to see the burdon continue to grow and reach into my house's 200 A panel fed from a very small transformer. There seems to be a lot of discussion in this forum about over reaching and the huge burdon resulting from all the new rules. |
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| Author: | JoeTedesco [ Sun Aug 31, 2008 9:52 am ] |
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Here's what the CMP said for the first proposal I sent 1-82 Log #1651 NEC-P01 Final Action: Accept in Principle (110.16) _____________________________________________________________ Submitter: Joe Tedesco, Boston, MA Recommendation: Revise text to read as follows: 110.16 Flash Protection. Switchboards, panelboards, industrial control panels, meter socket enclosures, and motor control centers and are likely to require examination, adjustment, servicing, or maintenance while energized shall be field marked to warn qualified persons of potential electric arc flash hazards. The marking shall be located so as to be clearly visible to qualified persons before examination, adjustment, servicing, or maintenance of the equipment. Substantiation: Removing the words: “that are in other than dwelling occupancies†makes sense because the hazards exist dwelling occupancies too. Many dwellings have services that are 400 amperes or more, and some services are located within commercial occupancies where there are stores and dwelling units all served by the same electrical utility system. I believe that this change will be in the best interest of safety. With the warning sign present a qualified person who may be a Home Inspector or NACHI member will be aware of the need for some form of PPE, probably Catagory 2. Panel Meeting Action: Accept in Principle Revise text to read as follows: 110.16 Flash Protection. Switchboards, panelboards, industrial control panels, meter socket enclosures, and motor control centers that are in other than one and two-family dwelling occupancies and are likely to require examination, adjustment, servicing, or maintenance while energized shall be field marked to warn qualified persons of potential electric arc flash hazards. The marking shall be located so as to be clearly visible to qualified persons before examination, adjustment, servicing, or maintenance of the equipment. Panel Statement: The panel has revised the proposal to only include one- and two-family dwelling occupancies rather than all dwelling occupancies because one- and two-family dwellings provide a reasonable demarcation for occupancies where arc flash hazards may exist. The panel does not necessarily agree with all of the substantiation of the submitter. Number Eligible to Vote: 12 Ballot Results: Affirmative: 8 Negative: 3 Abstain: 1 Explanation of Negative: LABRAKE, JR., N.: This proposal should be rejected. Qualified persons understand that equipment is to be placed in an electrically safe work condition before maintenance is performed. Generally, this can be readily accomplished in dwellings. Unlike some instances in commercial and industrial installations, it is not likely that electrical equipment in dwellings typically operated at less than 300 volts would have to be maintained while energized, and, therefore, do not need to be marked as to arc flash hazards. MCMAHILL, L.: Although I agree that arc flash hazard exists in dwelling occupancies, I disagree that it exists at the same level as in other than dwelling occupancies. Panelboards and meter sockets in dwelling occupancies are not subject to the same scrutiny as commercial and industrial type occupancies, and the potential arc flash energy is generally less too. Expanding the marking requirement to include dwellings other than one- and two-family is excessive. The marking requirement will apply to all panelboards and meter sockets in multi-family dwellings. This is over restrictive and provides no useful purpose. Flash protection warnings are intended for “qualified persons†working on energized equipment, such as in commercial and industrial type facilities. Adding such marking on dwelling equipment appears to only encourage working on equipment while energized. Equipment in dwelling occupancies should always be deenergized before servicing! MINICK: NEMA continues to support the position that personnel safety can best be assured when equipment is de-energized before performing any work. Explanation of Abstention: Explanation of Abstention: FISKE, W.: We are abstaining from voting on Proposals 1-82, 1-83, 1-84, and 1-85, as they relate to field marking of arc flash hazards. There is no role for conformity assessment bodies (i.e., nationally recognized testing laboratories) to play in fulfilling the existing or proposed requirements. As we are not an affected party, Intertek has elected not to take a formal position on the four proposals identified above. |
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