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)
