• PVC conduit  installation in gypsum board wall

    I need to ask if PVC conduit installations permitted inside gypsum board walls on Electrical installation (Electrical Sockets and Data Points) and Fire Alarm installation. I already Searched ARTICLE 352 in NEC 201...
    last modified by mazim8529
  • Residential Smoke Alarm Wiring Requirements

    Must all electrical connections to residential smoke alarms be made within junction boxes?  What are the other wiring requirements?
  • NFPA-72

    Can any one help me about MCP location and sounder with flasher location according to NFPA-72 in a hotel.
    last modified by abrar.b
  • engine hall

    please advise me which detector are good for engine hall heat detector or flame detector acording to NFPA-72
    last modified by abrar.b
  • NFPA-72 Engine hall

    please advise me which detector are good for engine hall heat detector or flame detector acording to NFPA-72
    created by abrar.b
  • NFPA-72

    i am design a fire alarm system in a hotel which is best for alarming sounder or sounder with flasher. give me NFPA raferance i have NFPA-72 1996 and 2007 edition.
    last modified by abrar.b
  • NFPA-72 Help

    Please help me to design fire alarm system according to NFPA-72.I have NFPA copie.
    created by abrar.b
  • I have a smoke detector in a small bathroom of a building. Later, the client decided to put a false ceiling. In our drawing, it is only mentioned smoke detector. But I do need to add above ceiling smoke detector?

    The depth of the false ceiling (measured from the actual ceiling) is 900mm. Also, please mention the code number in NFPA 72 for the above issue? 
    last modified by shamilbb12
  • Installing Extra Conductors Question

    Hello,    We are building apartments in Nevada. Does the fire alarm installer have the authority to install a wire with more conductors than the plan indicate? In our case, the plans show 18-2 for smoke det...
    last modified by andyv
  • NFPA 72 - Sound Calcs

    I am short on time and need help going in the right direction.   The AHJ wants the sound levels in each room without a horn/strobe. I indicate horn/strobes in the corridors and common spaces.   I know the ...
    last modified by wbf
  • If we install air aspirating system then there is no need of infra red beam detectors as per standard?

    We have oil rig Manufacturing warehouse of  length 128.12 , width 62.82 and height 13 meters,contractor  has proposed vesda  air aspirating  system, saying that if we install  air aspirating d...
    last modified by maqsoodasif17
  • Electric Griddle info.

    Hello, my company is promoting a function and we have 4 electric griddles similar to the George foreman type.  I was trying to find information on what gage extension cords are needed spanning a length of 75-100 ...
    last modified by troy.cornett
  • Ionizing radiation resistant fire detection

    Does anyone know about fire detection capable to resist to very high ionizing radiation fields (10 MGy)?
    created by nsss
  • NFPA 70 for deep well pump application Class 1 Division 2

    I have a project that takes storm water (not sewage) via gravity flow into an underground storage system (all debris has been removed prior to entering storage). This water will be treated via recirculation using...
    last modified by jalmaraz
  • Arc Flash Reduction Breaker

    NEC 240.87 for arc reduction circuit breakers of 1200A or more, when applying to an emergency generator with life safety and if accidently left 'on' could cause an unwanted trip.  Is there an exception or is ther...
    created by j_w_hines
  • Pull boxes penetrating walls

    Hi everyone!   We are doing a renovation project and one of our concerns is a pull box penetrating a wall. According to one of the project managers, in Japan's standards, a pull box made of a 1.6mm-thick p...
    last modified by ejlsanpedro
  • How far should I place a smoke detector or a heat detector from a beam or sidewall? This is regarding dead air space.

    I was going through NFPA 72, 2016 Edition. In code A, they showed the proper mounting placement of heat detectors with the following figure.     Can I use the above image for smoke detec...
    last modified by shamilbb12
  • What is the distance required between two smoke detectors? Is it 7m or 9m?

    The client said it should be 7m. In other sites, they said it should be 9m. Can anyone please clarify regarding the same?
    last modified by shamilbb12

    Hi All,   I am making a 3 Phase power meter using a MICROCHIP IC ATM90E36A. They recommend to use neutral wire as a GND reference to measure voltages at 3 hot legs but in my loads (Air Conditioners) there is no ...
    last modified by arshdeep
  • Who can test a local manual pull station alarm?

    Church built in the 1960's has two pull stations that both activate one bell (same bell.)   Can the AHJ fire inspector witness the operation of these devices by the owner or is he required to hire a fir...
    last modified by reilly4562