• Photovoltaic - 2017 NEC 705.12(B)(2)(3)(a) and 705.12(B)(2)(3)(b)

    The way I’m interpreting this section, the Photovoltaic installation must comply with either 705.12(D)(2)(3)(a) OR 705.12(D)(2)(3)(b):   (a) says that 125% of the inverter output circuit current (can be obt...
    last modified by chiefns830
  • Smoke detectors in multi-family building with fire alarm system

    Shall the smoke detectors in multi-family building ( individual units) to be connected to the building fire alarm system? if yes or no what's is the code section?
    created by kkhalifa
  • Does PRV require by pass arrangement?

    Project location: Bangladesh Pump Capacity: 1500 GPM Pump Head: 14 bar. According to code for sprinkler pressure should not exceed 12 bar. So we need to use PRV upto certain height. If each PRV require to use by pa...
    last modified by istiaque.emcs
  • NFPA 410 - Electriicaly Grounded

    NFPA 410 section requires "To reduce the hazards associated with static electricity, aircraft shall be electrically grounded when parked in aircraft hangars."   Boeing Aircraft are statically ground...
    last modified by jeff.l.tjernagel
  • Single motor protection with VFD per Article 430.130

    Looking for interpretation of Article 430.130(A)(1) and (2) with respect to Branch-Circuit Short-Circuit and Ground Fault Protective device rating for single motor applications when a VFD is installed. The article ref...
    last modified by tom.brenner
  • Spray Rooms & Aerosols

    We have an issue with a man who built a homemade spray room in his tenant space of a shopping mall. It has no ventilation and he is blocking sprinkler heads with storage. The walls are covered with visqueen and the fl...
    last modified by ldesmares
  • Elevator Recall

    Does Fire Sprinkler riser's water flow switch initiate elevator emergency recall? In NFPA 72 "Table A." Typical Input/Output Matrix" shows water flow switch on first or second floor initiate elevator emer...
    last modified by zara.mosavat
  • Are Sprinklers Required Above False Ceilings?

     Are sprinklers required above false ceilings? If required, What should be the Minimum Space above False Ceiling to consider sprinkler installation?
    last modified by hasparkar
  • NFPA terms (division/Zone)

    Hi,  In the NFPA 497 we speak about "division" and "zone". But, the area around figures still the same even if we speak about zones or divisions. Someone can tell what is the differences between this two terms ...
    last modified by ddufour
  • Kitchen Exhaust Ductwork Termination Through Roof

    NFPA 96-2011 (2) regarding roof top terminations states "roof top terminations shall be arranged or provided with the following... (2) a minimum of 1.5m (5ft) of horizontal clearance from the outlet to any com...
    last modified by jbraun
  • Hydraulic Calculation in big rooms having concealed Spaces (upright and pendent sprinklers)

    When doing the hydraulic calculations for an open space (having only upright sorinklers), we calculate the No. of sprinklers based on the Max. protection area and the Area of coverage (ex: 1,500 ft2 / 130 = 11.5 = 12 ...
    last modified by patrickbouchedid
  • DIGITAL inspection for annual fire extinguisher maintenance (seeking AHJ opinions)

    Hello,   We are looking at ways to make the annual maintenance process easier for more people, especially those in remote or rural areas who may have a hard time getting a service company to come and check their...
    last modified by mjpeters
  • MC cable for PV installation

    Article 330.12 prohibits MC cable when exposed to mechanical damage. 690.31(D) allows MC cable when intalled in an area that is not readily accessible.  My client wants to install MC cable across the open roof of...
    last modified by jeffrey

    - KITCHEN EXHAUST HOOD FIRE SUPPRESSION SYSTEMS - We get training from FPC- (Fire Protection Certification ltd.)  - Are there other companies that offer the same training? Thanks,
    last modified by frankterranova
  • Participate in the Development of an NFPA Standard by submitting a Public Input

    One of the most notable features about NFPA’s standards development process is that it is a full, open, consensus-based process that encourages public participation in the development of its standards. A great w...
    last modified by debbiebaio
  • Research Foundation Set to Study the Economic and Emotional Impact of Active Shooter/Hostile Events

    The Fire Protection Research Foundation, the research affiliate of NFPA is overseeing a two-year project on the Economic and Emotional Impact of an Active Shooter/Hostile Event – thanks to Fire Prevention a...
    last modified by cathylongley
  • Class II Standpipe requirement for light hazard occupancy

    I'm currently working on designing wet sprinkler system for a Dormitory of Ground and First Floor "Light Hazard Occupancy". The Building is fully sprinklered as per NFPA 13R-2016. The height of the First Floor is less...
    last modified by waelio
  • Errata issued on NFPA 70, National Electrical Code, 2020 edition

    NFPA has issued the following errata on NFPA 70®, National Electrical Code®: NFPA 70, Errata 70-20-1, referencing 700.16(B) of the 2020 edition, issued on October 10, 2019 An errata is a correction iss...
    last modified by debbiebaio
  • What is the scope for an ASSE 6010 Installer per NFPA99 in day-to-day operations?

    My question is specific to his day to day work. Is he the only one allowed to perform the connections and pipe laying? Or he acts more as a supervisor/foreman of his team. Is every person within the team needs to be a...
    created by jtalabera
  • Fire Hydrant

    Hello,   I am trying to find out where the fire hydrant is not required because the building is stand alone and far way from the city. Does anyone know which NFPA standard has the requirements for fire hydrant? ...
    last modified by wsjsxn