• POTS line will not “kiss off” at the monitoring point

    I’m told that our Buildings Fire Alarm system has trouble communicating with the Central Monitoring Station (CMS). The problem description I was given is, “the POTS line will not “kiss-off” at ...
    tmulanix
    last modified by tmulanix
  • Storage of Liquids in Underground Tanks

    Dear Community,   I wonder, which code or table is require to determine a distans from  Storage of Liquids (Fuel) in Underground Tanks to school or any public buildings?
    gk.karkashadze
    created by gk.karkashadze
  • 230/400V Color code

    Hi, my name is Andres, I m a student in electromechanical engineering, I have a doubt about the color code in voltage system, I know that 120/208/240V is: phase A= black, phase B=red, phase C= blue and nuetral=white, ...
    andrescr54
    last modified by andrescr54
  • 08/18/17: Energized Electrical Work Permit

    According to the 2015 edition of NFPA 70E, which of the following tasks would require an energized work permit in order to be performed in an energized state?
    dvigstol
    last modified by dvigstol
  • Fire rate cables for LPG leak detection

    I would like to know in which NFPA that requires the cables used in the LPG detection system shall be fire rated cables? is it NFPA 54 or 70? which section exactly, please?
    eng_mikemo
    last modified by eng_mikemo
  • Neutral to earth voltage is high.

    We are facing a peculier problem of Neutral to Earth voltage high.   2MVA Transformer 11KV/0.433KV , Dry type transformer is installed with LT drives.   When Drives are running in Regenerative Mode Neutral...
    vannamani.a
    last modified by vannamani.a
  • Trough busbar bonding methodology

    I have metallic trough load side of service disconnect means whose enclosure needs to be connected to the equipment grounding conductor. The trough has equipment grounding bus bar inside it.   In attached Figure...
    apurvadave
    last modified by apurvadave
  • Main Bonding Jumper Location and Main service Disconnect Residential

    Hey guys,  I'm doing a 3600 sq ft residential job where there is 1800 up and almost 1800 finished basement. The homeowner wants the panel located in the utility room in the basement which is 35' (cable length) aw...
    jeff_schirmer
    last modified by jeff_schirmer
  • Face-to-face Education Programs are Rapidly Becoming a Thing of the Past. Now What?

    Jennifer Froehlich, fire & life safety educator from Grand Traverse Metro Fire Department, Michigan displays her virtual learning environment with tools she learned from a recent workshop delivered by Brene Duggin...
    avastis
    last modified by avastis
  • Hoarding: From Enforcement to Engagement

        Hoarding criteria include the inability to use living space for its intended purpose.    Compulsive hoarding behavior among residents increases the risk of serious injury and death to...
    avastis
    last modified by avastis
  • Mythblaster Monday - Put the Freeze on this Myth about Home Fire Sprinklers in Winter

    Throughout our Mythblaster Monday series, we have pointed to resources that identify the benefits of home fire sprinklers and help combat the misinformation that surrounds them. Last week we debunked a myth frequently...
    cthompson
    created by cthompson
  • Question on 211 code

    Hi Everyone,   I am purchasing a home and am having trouble finding specific codes under 211. My question is related to how stainless steel chimney liners should/should not be installed in an older masonry chimn...
    michaelmezz
    last modified by michaelmezz
  • Nitrogen in a Wet System

    A vent is required in a sprinkler system at a high point to allow trapped air to be exhausted from the system, thus having less oxygen for the metal piping to react with. Thinking "out of the box" here, would it be he...
    fm4802
    last modified by fm4802
  • Sprinklers system requirement for business occupants.???

    Group B located inside (not separated from) factory building ( Group F-2). Is it required to be covered by sprinklers system??, Note that factory should be covered by sprinklers system as per nfpa101 ?  See...
    amaa93.12.awwad
    last modified by amaa93.12.awwad
  • what the allowed occupancies in basement floor ?

    what the allowed occupancies in basement floor ?  specially residential occupancy is it allowed in basement 
    amaa93.12.awwad
    created by amaa93.12.awwad
  • Pump room sprinklers

    In a fully sprinklered building, is it the intent of the code not to have to sprinkler a pump room housing an electrical driven fire pump when the total encloser is 2hour rated?
    maryd
    last modified by maryd
  • Nonrechargeable (nonrefillable) extinguisher

    NFPA-10 mentions Nonrechargeable (nonrefillable) fire extinguishers by definition and states they are excluded from the 6 year test with a lifespan of 12 years.  Are they allowed by NFPA code in a commercial offi...
    apsdan
    last modified by apsdan
  • Transformer Secondary conductor - Overcurrent Protection

    Requirement (2) Transformer Secondary Conductors Not over 3m (10 ft) Long and Requirement (3)Industrial Installation Secondary Conductors Not Over 7.5 m (25ft) Long. We have fulfilled the sub-clauses but which require...
    cl_yeoh
    last modified by cl_yeoh
  • Is Sprinkler required in Pump Room or Not?

    There is one 4 storied building using as garments factory. The building is protected with Fire Hydrant System.  My question is:  1. The pump room is outside of the main factory building and the pump room i...
    arifur_liton
    last modified by arifur_liton
  • Funcionamiento de las conexiones de manguera

    Según la norma NFPA 14-2019: 7.2.3.2 y 7.8.1, en un sistema clase I los límites de la presión residual deben estar entre 100 y 175 psi. ¿Para dar cumplimiento a lo anterior, la válvula...
    jihenaog
    last modified by jihenaog