• Installing Ethernet In My Home

    Hello,   I'm looking to install ethernet in my ~45yo house. Right now I'm looking to use unshielded Cat6a cables. I've read that 16-inch spacing between the ethernet cabling and my house's electrical wiring is b...
    last modified by benoechsli
  • NEC 220.87 : KW or KVA?

    NEC 220.87 allows for the existing load to be used for load calculations as follows: The maximum demand data is available for a 1-year period. The maximum demand at 125% plus the new load does not exceed the ampacit...
    last modified by ryan.h
  • Battery Back Up

    What is the standard back time of Batteries in non alarm condition and in alarm condition? 
    last modified by m.liaqat
  • 70E Question

    I have a question about format in 70E Can someone please tell me the format for measurements? (how it is written)   Is it metric (imperial) format like in NEC? Or is it imperial (metric) format like in all oth...
    last modified by chiefns830
  • In the rv section 1192 is there a code that prohibits 120v wiring in ac ducts? I have a overheads ac units that is full of wiring

    In the rv section 1192 is there a code that prohibits 120v wiring in ac ducts? I have a overheads ac units that is full of electrical an tv wiring. It fills the duct about 70% and restricts the air flow.
    last modified by windmill458
  • UL

    Do the electrical components of a Tunnel Boring Machine for a tunnel construction in Virginia have to be UL approved or listed?. The TBM will be mining in gassy conditions (C1D2)
    last modified by ernestorene
  • SCCR with control panels fed in series

    I am trying to interpret correctly the logic of the SCCR method suggested in NEC 409.110 (4).b  which is the UL508A SCCR Calculation. According to this method, all the components in the feeder circuit would defin...
    last modified by zeno
  • Fiber Optic Cabling

    Can 480V power wiring and fiber optic cables be installed in the same conduit per 2020 NEC? What are the requirements and/or restrictions?
    last modified by jamieshea
  • Hospital Grade Receptacle

    NFPA 99 (2015 edition) (D) notes a receptacle is not required in bathrooms If a receptacle is installed would a hospital grade be required? Part A required hospital grade at patient bed locations. Is a rec...
    last modified by randolphwiggins
  • Nursing home question

    For NEC, Is a nursing home considered a health care occupancy where persons are not capable of self preservation?   Yes?   -or-   No?   From 517:   Nursing Home. A building or portion of ...
    last modified by chiefns830
  • Zone 22 device in Zone 2 area

    A process room contains a piece of machinery rated Class I Zone 1 internally, Zone 2 externally. An auxiliary piece of equipment rated Class II Zone 22 is being added. What are the requirements for the Zone 22 item; d...
    last modified by wanda.earll

    A customer is installing a permanent Above Ground pool.   He is asking to install on the ground perimeter LED strip "tape" lighting. ¿Is it allowable to do it, if using a Listed Class 2 LED driver?  ...
    last modified by abetovr
  • Electric Heater and outlet inside bathroom

    Is it ok to put an electric heater (radiator) and its electric outlet in the bathroom, if yes what are the minimum distances from the shower and wash sink that are required?
    last modified by thafer.shishani
  • Existing Electric Room 110.26

    Would the NEC 2017 110.26 C 3 require 2 doors for an existing electrical room with a 1600 amp service if the only new work is to add a  breaker feeding a new distribution board in a new Electrical room? Currently...
    last modified by inspectorq
  • Underground Conduit Reducer

    Is it permitted by NEC to use a conduit reducer in an underground installation of PVC? We would like to reduce from 2 1/2" to 2" PVC for an underground service conduit system.
    last modified by jamieshea
  • Third Party Certification for Pipe of Aspirating Smoke Detectors

    I am using Aspirating Smoke Detectors in a factory. Do we need Third Party Certification for Pipes of Aspirating Smoke Detectors?
    last modified by azad.musfiqul
  • SJ/SO cord conductor color use

    I have a heating unit that is supplied 3 phase (with ground) power via an SJ/SO type of cord (it may be either 230 or 460).  The question is about conductor colors within manufactured cables: do I have to re-iden...
    last modified by kgilpin@adcomfg.com
  • Electrical and Telecommunication Rooms need automatic sprinkler or not.

    Dear NFPA,   My project is 3 story residential building, whole building is sprinkled including service rooms. 1) Electrical Room is not sprinkled. 2) Telecommunication Room is equipped with telephone racks and...
    last modified by accesstocode
  • Numbering of the Electrical Code

    Can anyone tell me what style guide NFPA uses to determine the numbering of sections of the electrical code?  I am working on the Seattle Electrical Code and am needing to know how some subsections are numbered.
    last modified by jenifer.gilliland
  • As a plumber do you need EH rated shoes?

    Hi,   I've just joined and have a question about plumbing work. If I'm working on a sink with a disposal, are EH rated shoes needed. I never thought about it before but my friend mentioned that he wouldn't do a ...
    last modified by thefootfacts