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] (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. If the reader is not the intended recipient, you are hereby notified that any dissemination, distribution or copying of this communication is strictly prohibited. If you have received this communication in error, please notify us immediately by telephone, return this message to the address above and delete all copies. 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] (Put the word unsubscribe in the subject field)
