OK John/ Chris: Chris said," Isn't it the where that make the difference between the two not the clamp?"
Certainly rod and rings attached to steel beams could be a method of bonding. Maybe not, though if coatings like paint have not been penetrated. But how about the reliable connection to ground? Should one run a conductor to the building electrical ground? Where? to the ground bus in a branch circuit panel? The driven ground rod? Should the location be noted on the riser? Do all couplings on pipe inside the building ensure continuity of the bonding between pipe lengths. What if there are dielectric couplings between piping of dissimilar metals? I wonder if, or how many people have been killed or injured by touching an ungrounded-but electrically charged sprinkler system component. Perhaps it is more likely that someone simultaneously touches a hot conductor and a grounded pipe, I had a UL listed coffee maker with a two-prong plug. Because of an internal fault, when I touched the metal warming plate and the steel kitchen sink, I got a shock. If the sink had not been grounded, I would not have been shocked. Ed On Wed, Jan 28, 2009 at 11:05 AM, John Drucker <[email protected]>wrote: > Ed, > > There are a number of manufacturers that supply listed pipe clamps with > attachment lugs in sizes 1/2"-12" and conductors to 1000 kcmil. > > http://www.nema.org/ may be of assistance locating product. > > Have I seen lugs on vics ?, yes, however to the best of my knowledge > this is not permitted. > > John > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Ed Vining > Sent: Wednesday, January 28, 2009 1:26 PM > To: [email protected] > Subject: Re: FW: Grounding, Bonding and Sprinkler Piping > > I agree, but to what should the ground/bonding wire from the riser be > connected? > > On Wed, Jan 28, 2009 at 8:48 AM, John Drucker > <[email protected]>wrote: > > > Ed, > > > > In my professional opinion I would say the riser after any backflow > > devices, fire pumps, alarm and check valves, i.e. items that are > > expected to be removed for repair or replacement, however the code > > does not stipulate this. In all cases the electrical engineer and > > local inspector are to be consulted. > > > > Hope that helps. > > > > John Drucker > > > > -----Original Message----- > > From: [email protected] > > [mailto:[email protected]] On Behalf Of Ed > > Vining > > Sent: Wednesday, January 28, 2009 11:13 AM > > To: [email protected] > > Subject: Re: FW: Grounding, Bonding and Sprinkler Piping > > > > John, what do you consider an appropriate place(s) to connect the > > sprinkler piping to ensure a reliable connection to ground? Just > > connecting it to the nearest piece of metal might not suffice. > > . > > Ed Vining > > > > > > On Wed, Jan 28, 2009 at 4:48 AM, John Drucker > > <[email protected]>wrote: > > > > > Subject: Grounding, Bonding and Sprinkler Piping > > > > > > > > > >From an industry forum list (AFAA Firealarm). Apparently NFPA-25 > > > inspectors > > > (contractors) are either removing the bonding connection and or > > > noting > > > > > it as a violation................................ > > > > > > John > > > > > > -------------------------------------------------------------------- > > > -- > > > ---- > > > > > > From: John Drucker <[email protected]> > > > Subject: RE: [firealarm] Ground Rod Questions > > > > > > All interior water piping within a building, including metallic fire > > > > sprinkler piping is required to be bonded pursuant to 2008 NEC > > > 250.104(A)(B) > > > . > > > > > > Failure to bond a metallic piping system could result in the piping > > > system becoming energized with the potential of shock or > > > electrocution. Bonding merely places all metallic components within > > > a building at equipotential.These components, water piping, gas > > > piping, building steel, etc are bonded (electrically connected > > > together) to > > the electrical system. > > > A > > > properly bonded system assures a low impedance electrical path > > > exists should a fault occur producing the needed fault current in > > > order to operate a circuits overcurrent device thus clearing the > > > fault by deenergizing the circuit. > > > > > > Grounding on the other hand is the connection of the buildings > > > electrical system to earth in order to dissipate lighting, > > > transients and stabilize system voltage. Grounding is not Bonding. > > > The sprinkler piping prohibition applies to the use of fire > > > sprinkler piping as a Grounding electrode. Its important that we not > > > > remove bonding jumpers from aboveground fire sprinkler piping. If > > > you're not sure consult with your electrical inspector. In the end > > > it might just save someone's life ! > > > > > > Sincerely, > > > > > > John Drucker > > > > > _______________________________________________ > > Sprinklerforum mailing list > > http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum > > For Technical Assistance, send an email to: > > [email protected] > > > > To Unsubscribe, send an email > > to:[email protected]<to%[email protected]> > <to%3ASprinklerforum-reques > > [email protected]> (Put the word unsubscribe in the subject field) > > > > CONFIDENTIAL AND PROPRIETARY: > > This email message is intended only for the use of the individual or > > entity to which it is addressed and may contain information that is > > privileged and confidential, nor is it, unless specifically stated, > > intended to be relied upon by any person or persons other than the > > individual or entity named above and no warranties or representations > > are made or intended to persons or entities not named above. 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Thank you. > > > > _______________________________________________ > > Sprinklerforum mailing list > > http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum > > For Technical Assistance, send an email to: > > [email protected] > > > > To Unsubscribe, send an email > > to:[email protected]<to%[email protected]> > <to%3ASprinklerforum-reques > > [email protected]> (Put the word unsubscribe in the subject field) > > > > > > -- > Ed Vining > 4819 John Muir Rd > Martinez CA 94553 > 925-228-8792 > _______________________________________________ > Sprinklerforum mailing list > http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum > For Technical Assistance, send an email to: > [email protected] > > To Unsubscribe, send an email > to:[email protected]<to%[email protected]> > (Put the word unsubscribe in the subject field) > _______________________________________________ > Sprinklerforum mailing list > http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum > For Technical Assistance, send an email to: [email protected] > > To Unsubscribe, send an email > to:[email protected]<to%[email protected]> > (Put the word unsubscribe in the subject field) > -- Ed Vining 4819 John Muir Rd Martinez CA 94553 925-228-8792 _______________________________________________ Sprinklerforum mailing list http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field)
