Please clarify what you mean by high-voltage. NEC says over 600 V is high voltage, but the typical bus bar in industry is only 480 volts. Not high voltage. And they are usually not open to the world. Usually some kind of enclosure. If open, then that could be a bigger hazard to personnel.
If really high voltage and uninsulated then several feet of clearance would be needed. We have all seen the videos of the guy in his back yard and the ladder that comes close to the overhead line. The arc starts forming well before the ladder contacts the line. Is that what you are referring to? John Hoffman P.E. | Fire Protection Engineer | Facility Engineering Services, KCP, LLC - Burns & McDonnell Engineering | National Nuclear Security Administration's Kansas City Plant | Operated by Honeywell FM&T | 2000 E. 95th St | Kansas City, MO 64131 | ph 816-997-7213 | [email protected] From: "Ford, Charles" <[email protected]> To: "[email protected]" <[email protected]> Date: 05/04/2012 06:55 AM Subject: RE: High voltage clearances Sent by: [email protected] I thought NFPA 13 had a chart specifying clearance distance from sprinkler piping and hi voltage open bus bars. I can't find it. There is one in 12 ( co2 systems) but not eaxctly the same thing. I have a partner asking if there is a minimum distance. any thoughts out there? C. Burton Ford Nicet Certified Special Hazards IV Fire alarm IV Sprinkler III Water Based Inspections I NFPA Certified Fire Protection Specialist [CFPS] Cintas Fire Protection 1038 Conshohocken Road Conshohocken ,PA 19428 610-233-1400 Fax 610-233-1401 ________________________________________ From: [email protected] [[email protected]] On Behalf Of Stewart Kidd [[email protected]] Sent: Monday, April 30, 2012 6:26 PM To: [email protected] Subject: Re: Aerosol vs Halocarbon/Inert extinguishing agents - Firepro Answers - Please comment! Reza 1. Why does IBM use sprinklers (with water) in all its factories and units ? 2.Data can be recovered from hard drives which have been wetted by sprinklers or fire hoses - this is not true of powders 3. Clean up of powder even when there has been no fire is very expensive as the powder is hygroscopic. 4. Tests in Norway and by US GSA suggest that powder is damaging for heritage objects - especially paintings, glass and china Best Stewart On 30 Apr 2012, at 20:34, Ed Vining wrote: > 1. Being OK for electrical doesn't automatically make it OK for > electronics or systems with moving parts. > > 3. Continued training and awareness can't be counted on. George Church's > anecdote about the fire alarm in a restaurant proves that people are dumber > than sheep. Sheep will at least follow the leader. > > 4. There isn't always a huge mess. Just because aerosol might not be > worse than some of its competitor doesn't make the method of choice. > > Ed Vining > 4819 John Muir Rd > Martinez CA 94553 > 925-228-8792 > Cell 925-787-0465 > > > On Mon, Apr 30, 2012 at 12:17 PM, Reza Esmaeili > <[email protected]>wrote: > >> >> >> >> >> >> I have contacted Firepro which is making UL listed Aerosol units and asked >> them the below questions, I would appreciate your comments on their answers: >> >> 1- According to NFPA 2010 "Aerosol fire-extinguishing agents shall not be >> used on fires involving Deep-seated fires in Class A materials", then do >> you offer Firepro units to be used in Paper/Book Archive Rooms facing deep >> seated fire in class A material? >> ANSWER: All fixed gas extinguishing systems, as well as aerosol systems >> are tested and certified for Class A, surface burning fires. The test >> protocols for polymeric materials and wood specify pre-burning times from >> 3.5 min. to 6 min. respectively. Longer burning time is considered as deep >> seated fires. >> >> 2- According to NFPA 2010 "The potential adverse effects of agent >> particulate residue on sensitive equipment shall be considered", then do >> you offer Firepro units to be used in Server Rooms with sensitive hard >> disks. >> ANSWER: FirePro has been independently tested by NLR (Dutch National >> Aerospace Laboratory) and TNO (Netherlands Organisation for Applied >> Scientific Research), proving that there are no effects on (a) corrosion of >> sensitive electrical components, and (b) the operation of electrical >> equipment, respectively. >> >> 3- According to NFPA 2010 "aerosol systems shall be used in normally >> unoccupied areas because of visibility obscuration and the potential health >> effects of accidental exposure to the agent" then do you offer Firepro >> units to be used in Monitoring Rooms where people usually exist? >> ANSWER: Please see detailed response >> www.esmaeili.ir/Aerosol-in-occupied-areas.pdf >> >> 4- Do you offer Firepro units to be in a place where dust or residue is a >> matter of concern and clean-up procedure costs too much like a museum, art >> gallery? >> ANSWER: Please note, after a fire, there is a huge mess, Therefore, after >> a fire, you are going to clean anyway ! FirePro has been used in museums >> and old cultural buildings, etc, the consequences of other extinguishing >> agents such as halocarbons, especially in electrical/electronic >> applications, can be more serious; of paramount importance is the >> liberation/formation of HF (hydrogen fluoride) and CO at high temperatures. >> So it is best to sweep/dust the FP particles than to damage/destroy the >> electrical components with the decomposition of halocarbons/FM-200. >> >> >> Best, >> Reza >> -------------- next part -------------- >> An HTML attachment was scrubbed... >> URL: < >> http://fireball.firesprinkler.org/mailman/private/sprinklerforum/attachments/20120430/aca9680e/attachment.html >>> >> _______________________________________________ >> Sprinklerforum mailing list >> [email protected] >> http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum >> > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: < http://fireball.firesprinkler.org/mailman/private/sprinklerforum/attachments/20120430/55489afc/attachment.html > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum This e-mail transmission contains information that is intended to be confidential and privileged. 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