Thanks for the feedback do far. I am gaining a better understanding of it... A surgery room in a hospital where it appears most of the pipes above the ceiling are bonded or grounded with wire attached to a clamp attached to the pipe back to an elec panel in the wall of the same room... Is this allowed?
Columbus Automatic Sprinkler, Brandon Hunsinger 706 358 2535 > On Dec 5, 2013, at 4:55 PM, "John Drucker" <[email protected]> wrote: > > Hence why some in the electrical sphere of influencing want to change > the term to "earthing" here in the colonies, yep earthing. > > Article 250 of the NEC is most likely the most misunderstood section of > the code, guess that's why guys like soares, iaei and the like publish > books 3/4" thick on the topic, add in Ufer grounds (concrete encased > electrodes), csst bonds (gas tubing) , isolated grounds (the orange > receptacles) with a sprinkle of derived sources (generators that break > the neutral on transfer) and finished with fault currents (what it takes > to open the breaker) and heads start a spinning, reminiscent of the > engineer of the silver strings submarine band who smashes all the fuses > in the panelboard with a hammer. > > But in a nutshell; > > Bonding = Connect all (which includes pipes) the different metal stuff > together with straps, screws, bolts, fittings or jumpers. The whole > idea is that if an energized conductor (hot wire) makes contact with the > metal stuff sufficient current (fault current) will flow back to the > (source) panelboard overcurrent device (fuse or circuit breaker) and > trip it deenergizing the circuit instantly. > > Grounding = Connect it to earth. Typical DIP Fire Service undergrounds > DO NOT COUNT as a grounding electrode pursuant to the NEC which clearly > defines them and DIP isn't one (please don't anyone make the mistake of > one of our tired posters and ask about PVC and CPVC). A sharp > electrical inspector will say hey it looks good but it doesn't count. > The idea here is to provide a reference to stabilize voltage and provide > a bleed path for lightning. In order to do that the pipe metal MUST be > in DIRECT contact with earth and the DIP coating prevents that. > > Hope that helps, happy electrons to all. > > John > > John Drucker, CET > Assistant Construction Official > Fire Protection Subcode Official > Building/Fire/Electrical Inspector > Borough of Red Bank, New Jersey > Office: 732-530-2760 X 331 > Cell/Text: 732-904-6823 > Email: [email protected] > http://www.redbanknj.org > > > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of > Taylor, Galen > Sent: Thursday, December 05, 2013 4:32 PM > To: [email protected] > Subject: RE: Grounding > > Think about ... grounding is a term used for "earth" on old electrical > diagrams. An electrical system is not "grounded" unless it goes to > earth. And if you're talking about fire sprinkler piping, it's not > permitted to be used for electrical grounding. > > Galen Taylor > County of Los Angeles Fire Department > Fire Prevention Engineering > 323-890-4339 > [email protected] > > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of > Brandon Hunsinger > Sent: Thursday, December 05, 2013 1:22 PM > To: [email protected] > Subject: Grounding > > Can aboveground piping be used for grounding or bonding electrical > systems. I see where underground pipe can be used for bonding but not > grounding... > > Columbus Automatic Sprinkler, Brandon Hunsinger > 706 358 2535 > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler > .org > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler > .org > > > 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 > [email protected] > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
