• 2020 NEC Definition

    I have a question on the 2020 NEC code – definition of a term.  In Article 100 (70-35)  there is a definition for “Dwelling Unit”.  It states: A single unit ….. My question is ...
    apshulick@ieee.org
    last modified by apshulick@ieee.org
  • Fire Fighting Pump Requirments

    Hi, I need fire fighting pump requirements according to NFPA please help me about it.   Thanks 
    abrar.b
    last modified by abrar.b
  • Connect portable generator to house power?

    Hi, How can I safely connect a portable generator to supply power to a house? The house has a standby generator which no longer works, and the stator and rotor windings are completely shorted. I lease the house and...
    tgammonphd
    last modified by tgammonphd
  • 240.21 feeder tap directly to utilization equipment?

    Since the 2014 edition, 240.21(B)(1)(1)(b) has allowed a 10 ft feeder tap to terminate on "equipment containing an overcurrent device" as an alternative to terminating directly on an OCPD.   I would like to conn...
    cfharr
    last modified by cfharr
  • Ground Tied To Neutral Bar. Please Help.

    Good Afternoon,        I have a question hopefully I can get some help on. I was troubleshooting a recepticle in co-op apartment that is not working. I went to the circuit breaker panel and when I...
    jesus.rodriguez1808
    last modified by jesus.rodriguez1808
  • AFCI breakers

    Has anyone heard of any issues of AFCI breaker unavailability due to factories that shut down?
    chiefns830
    created by chiefns830
  • How can calculate the pump head

    How can calculate the pump head. please share me method
    abrar.b
    last modified by abrar.b
  • extension cord for appliance

    I have a office that needs to have power for a refrigerator.. Put I have only 2 options  1. run a new line to the  appliance 2. run a extension cord with a gfci..   I know i can do the first one. But...
    jrendon6861
    last modified by jrendon6861
  • NFPA 101 emergency lighting

    Hello everyone,    I am working on an emergency lighting scheme for a hospital and the client wants this to be done as per NFPA 101. I am just wondering if there's a guide that clearly shows the emergency l...
    mohamed.ehtiawesh
    last modified by mohamed.ehtiawesh
  • Pre-Action vs Dry Pipe air monitoring

    Pre-action vs dry pipe sprinkler systems, high and low air pressure monitoring.   I am designing a new pre-action system that is arranged for double interlock with smoke detection for activation of solenoid. I k...
    imran.malik
    last modified by imran.malik
  • 38.6.3.2.1 of NFPA 38 – Marijuana Growing, Processing, or Extraction Facilities

    38.6.3.2.1 Extraction and post oil processing operations including dispensing of flammable liquids between containers, shall be performed in one of the following locations: A chemical fume hood in accordance with Ch...
    mtrzcinski
    last modified by mtrzcinski
  • Storage Batteries Art - 480

    The question is in Article 480.10 (E) Egress, "rooms designated as battery rooms" do we have a definition of a battery room ? I didn't find one in Art- 480 or in Art -100 . The requirement to have doors that swing in ...
    glillmar
    last modified by glillmar
  • Lightning protection from tower NFPA 70 artcle 250.60 & 106 and NFPA 780

    Lightning protection systems NFPA 780 and NFPA 70 article 250.60 and 250.106   I have a design with has multiple towers on these towers the manufacturer has lighting strike protection, the tower is aluminum they...
    c.valvo
    last modified by c.valvo
  • Code Compliance of Existing Installation

    Is anyone aware of a NFPA code/standard or other citable industry authority that generally discusses that code compliance for an existing installation is determined by the code in effect at the time of construction?&#...
    gbstand
    last modified by gbstand
  • Cell tower

    I have existing monopole tower for antenna which is grounded and bonded.   Now the structural engineer is going to place long shaft metal plate metallic on each side of the monopole tower by drilling holes in to...
    apurvadave
    last modified by apurvadave
  • 408.4(A) Approved degree of detail

    Someone please, inform me.  What is a "poke through?" Does this have an approved degree of detail? Is this meaning clear? Am I being unfair by not signing off on this?
    chiefns830
    last modified by chiefns830
  • NEC Online Training Series consistent with the 2020 edition; features grounding, bonding, motors and HVAC equipment

    The way people work and learn has changed considerably in recent years, and particularly, in the months since COVID-19 took hold in the United States. NFPA has been following this trend for years and mobilizing to mee...
    cathylongley
    created by cathylongley
  • Lab Natural Gas Serrated Hose Nozzle; Hazardous Zone

    For a lab with a serrated hoze nozzle and valve for natural gas used in heating small burners, is this a hazardous zone and if so is there a hazardous zone diagram?  NFPA 497 offers some help, but not specific to...
    j_w_hines
    last modified by j_w_hines
  • Article 445 Question

    Does a Turbine fall under Article 445, specifically a Capstone C1000S?
    chiefns830
    last modified by chiefns830
  • Light above shower

    In a residential bathroom is the light over the shower required to be GFI protected?
    davidvartanoff
    last modified by davidvartanoff