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Arc Fault GFCI confusion

Discussion in 'Security Alarms' started by Nick Markowitz Jr., Dec 28, 2007.

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  1. Here is the quickie on arc fault and gfci issues regarding Fire/burg systems
    etc. per new NEC 70 which seems to be causing confusion

    Arc fault protection is required if smoke alarms being installed in a
    bedroom are the 120vac type if the smoke detectors are low voltage and
    attached to a fire/burg panel they do not need arc fault protection.

    If the outlet you are plugging the power supply for the fire/burg panel is
    in a bedroom area that outlet would need arc fault protection if it is new
    construction or newly installed.

    Regarding gfci protection if the fire/burg panel power supply transformer
    is plugged in to an area such as unfinished basement ,garage etc which
    requires gfci protection. A single purpose dedicated outlet just for the
    fire/burg system can be installed and does not need gfci protection so a
    gfci nuisance trip will not interfere with system operation.
  2. Bob La Londe

    Bob La Londe Guest

    Nick, I have experienced that GFI breakers tend to have a much lower
    incidence of nuisance trips than GFI receptacle. The price however tends to
    be much higher, and since most new homes require 2-4 GFI circuits depending
    on configuration the cost will add up, so being the ever wise masters of all
    things with wire the electricians don't seem to use them.

    The guy who makes the final decision
    on who we do business with.
    Bob La Londe

    The Security Consultant
    Bob La Londe - Owner
    P.O. Box 5720
    Yuma, Az 85366

    (928) 782-9765 ofc
    (928) 782-7873 fax

    Licensed Contractor
    ROC103044 & ROC103047
  3. Frank Olson

    Frank Olson Guest

    You guys just love those wall warts, dont'cha?? We hard wire our
    transformers. We use the Frost double pig-tail units. The high voltage
    end gets mounted to an 1110 box (or extenstion ring), and the other end
    mounts to the lower knock-out of the can. No fuss. No muss.
  4. In Connecticut GFCI protection was only required if the outlet was
    below grade or in a wet location (kitchen, bath, laundry, etc). Our
    solution was to mount either a single quad or two duplex outlets on
    the alarm backboard above grade level. That gave me room for more
    than one transformer plus power for light and tools next to the

    BTW, if the job entails multiple power supplies and other
    wall-mounted stuff, I like to have a shelf for tools, manuals and
    stuff. When doing integrated systems consider installing a half or
    even full sheet of 1" exterior grade plywood on the basement wall.
    You can mount a multi-outlet power strip near the top and plug in all
    your wall warts there. I sometimes used to nail studs to the
    basement wall (nail gun) and mount the plywood to them, leaving a
    hollow chase behind to drop my cables. Then I'd use the large
    knockouts on the backs of the panels to bring the wires in through
    the plywood. The effect is nice and clean -- no wires visible
    outside the boxes -- but you have to fuss with them a bit more to
    make everything stay neat inside the boxes. You also need to leave a
    gap hear the ceiling so you can easily fish new cables in later if

    Borrowing from a tip in one of the trade rags many years ago, I used
    to buy ACX (waterproof and very smooth on the good side) plywood and
    either shellac it or paint it gray before mounting. If I had some
    spare time I would pre-cut the cable holes and mount the cans on the
    back board at the office, run interconnect cables as needed, then
    bring it over in the van and hang the whole thing at once.


    Robert L Bass

    Bass Home Electronics
    4883 Fallcrest Circle
    Sarasota · Florida · 34233
    Sales & Tech Support 941-925-8650
    Customer Service 941-232-0791
    Fax 941-870-3252
  5. Not using one side of the duplex plug and cutting off the tabs would meet
    the intent of the single purpose outlet
  6. alarman

    alarman Guest

    "Robert L Ass" wrote I used to...

    snipped bullshit story

    Yeah, sure fat boy.

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