• Transformer Secondary Conductors

    NEC 240.21 (C) states that conductors are permitted to be connected to a transformer secondary without overcurrent protection at the secondary. It further states that 240.4(B) is not permitted.  240.4(B) is for n...
    last modified by j_w_hines
  • NFPA 130: 2017

    1) Is Clause 6.2.5 is applicable for Cable troughs (cable trenches or boxes) running on rail viaduct/tunnels?   2) Chapter 12 applicable all locations of metro buildings (stations, viaduct, tunnels, at grade etc...
  • Interpretation of NFPA 130: 2017 clause 12.4.1 & 12.4.4

    Question 1: Whether NFPA 130: 2017, chapter 12 requirements are applicable to Trainways (Metro rail Viaduct/tunnels) as mentioned under clause 12.1.1. Please confirm?   Question 2: As per NFPA 130: 201...
  • NFPA 1:  Fundamental electrical safety requirements in the Fire Code

    Special thanks to Val Ziavras, Fire Protection Engineer at NFPA and Staff Liaison to the Fire Code Technical Committee, for writing this week’s Fire Code Fridays blog.    A recent viral video has bee...
    last modified by kristinbigda
  • power from multiple sources

    Two industrial control panels, 480/60/3 are installed on a machine system. Each has a disconnect switch. One panel houses variable frequency drives, and the low-volt signal wiring for the drives is derived from the ot...
    last modified by wanda.earll
  • 02 cylinder signage question

    I work in a healthcare facility. While doing an inspection the other day, I came across O2 cylinders properly labeled full and empty and were divided the correct way. There is no door needed to access this room w...
    last modified by mikeboodry
  • Determine available arc fault value

    I am currently supporting development of a contractor electrical safety program w/ implementation of NFPA 70e. My question is regard determination of  Fault Current (Available) in order to satisfy the use of...
    last modified by tdotts
  • A Better Understanding of 70E: Take My Poll to Help Me Better Address Electrical Safety Topics You Need to Know About

      Time flies. I have been the staff liaison for NFPA 70E, Standard for Electrical Safety in the Workplace  for the past two cycles. I have fielded hundreds of electrical safety questions from employer and e...
    last modified by ccoache
  • DTM- Safer smoke alarms

    Open video

    created by carretero110
  • Steam Boilers running on LPG in basements

    Is there any restriction to install a steam boiler running on LPG in basements? What are the available ventilation systems to prevent the accumulation of LPG in case of leak. 
    created by eng_mikemo
  • Chemical Store Protection

    I am going to design a flame detector in a chemical store so any one give me NFPA raferance.
    last modified by abrar.b
  • Fire Protection to Fire Water Piping in LPG Sphere Dike?

    Greetings to everyone, I have a question:   In my company we have LPG storage spheres, these have their own water spray protection system in case of nearby fire. Now the AHJ says that it is necessary to install ...
    last modified by juan.guaylupo
  • Oxygen-Enriched Atmospheres Ref.

    I am undertaking an experimental study regarding oxygen-enrichment in a room due to a potential oxygen leak to determine the need to install oxygen monitors or not. NFPA 53 defines an oxygen-enriched atmosphere as...
    last modified by richard.barry
  • Can you disable a smoke detector temporarily with a dust bag for maintenance work?

    Hot work needs to be done in a school, a four inch steel pipe needs to be cut to be specific. Is it against code to cover the nearby detector with a dust bag temporarily while the Hot Work is being performed?  My...
    last modified by xwhitney
  • Substation transformer Deluge system test frequency?

    What are the frequencies of testing deluge systems for transformers?   Mainly the full trip test?  If you can produce a chart just for deluge systems that would be great!   Thanks
    last modified by nathan.fraley
  • Leak detection requirements for underground storage tanks.

    Are newly installed underground storage tanks  intended for fire water suppression storage required to go through a leak testing procedure prior to being put into service?
    last modified by dhauser
  • Life Safety Plan - Working Lab in Business Occupancy?

    Building Construction Data:  Hospital Built in 2016 in West Virginia using NFPA 2009 and IBC 2009, Type II Construction (2,2,2 Institutional and 0,0,0, Business).  There is a two hour fire barrier between In...
    last modified by mbryand
  • Two new infographics give tips for landlords and renters of the vacation home away from home

    Millions of people across the world are renting or hosting peer-to-peer hospitality services, such as Airbnb and Vacation Rentals by Owner. According to property management experts, on any given night, two million peo...
    last modified by lisabraxton
  • NFPA1 united fire code

    Hi, if I am correct, my commercial smoker ( which is kept outside) needs to be 10 feet from any wood structure. Could a barrier be installed in front of the wood structure which would allow the smoker to be closer to ...
    last modified by paulsbbqpit
  • FEMA Releases 2019 National Household Survey Results

    FEMA has released the results of the 2019 National Household Survey (NHS) and survey data are available on OpenFEMA.   The National Household Survey tracks progress in personal disaster preparedness through inve...
    created by lisabraxton