• Working 120v Live

    When working 120Volt Circuits live Receptacles, switches what PPE is required?
    last modified by justin.grantham
  • 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...
    last modified by cfharr
  • qualified observer

    I have a question.  If there is a crew going out to do some  electrical maintenance. But only one member of the crew is a qualified electrician. do the other people assisting him need to have CPR and other ...
    last modified by jrendon6861
  • What is the permissible gap of an opening for a ceiling product or tile when running wires though a tile into a Ceiling that is being used as a plenum?

    There is a product that we want to install in a ceiling in a Healthcare facility and understand the requirements of firestopping for cables but what is the permissible gap for an opening to limit the spread of sm...
    last modified by safedesign1
  • 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 ...
    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 
    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...
    last modified by tgammonphd
  • 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...
    last modified by jesus.rodriguez1808
  • AFCI breakers

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

    How can calculate the pump head. please share me method
    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...
    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...
    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...
    last modified by imran.malik
  • of NFPA 38 – Marijuana Growing, Processing, or Extraction Facilities 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...
    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 ...
    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...
    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?&#...
    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...
    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?
    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...
    created by cathylongley