• NEC 210.71

    For an existing conference room where the Architect required adding an outlet, the plan check person has required outlets as per this article, which requires quantity as in a residence.  In addition, it requires ...
    last modified by j_w_hines
  • 2017 NEC 680.7

    Does NEC 680.7 apply to factory and field installed lugs, the way I read it is the first sentence would apply to factory lugs and the second sentence would apply to field installed lugs. 
    last modified by mdemps3
  • 480 VAC VFD Power - Do I need an Enclosure & Disconnect?

    Hi,   I work for an equipment manufacturer.  For a machine we are building, I have a VFD for an Exhaust Blower that requires 480 VAC 3-phase 6 amps.  The VFD is designed so that it can be mounted on a ...
    last modified by pwk@kraemerkoating.com
  • AFCI for Dishwasher ?

    Pa started following the 2014 NEC so my questions is 1) 210.12(A) - does a dishwasher for a dwelling require AFCI protection if on a dedicated circuit (I know it needs GFCI protection) 2) same question, how about a ...
    last modified by gk1226
  • emergency ATS connected load side of optional ATS

    I am reviewing plans that specify an emergency system and a optional system, the generator has 2 breakers one for each system, but the optional system ATS is specified to be installed to re-feed the entire existing 80...
    last modified by mdemps3
  • Table 310.16 vs. Article 400 for a 3-conductor VFD cable?

    Hi,   I am working on a project in which I will be using a VFD to drive an AC motor.  For the motor power cable from the VFD to the motor, I am planning to use a cable with a braided shield that is specifica...
    last modified by pwk@kraemerkoating.com
  • 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
  • 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