• Could someone tell me if this is safe?

    Hello all.   I have an easement on my property that runs from an electrical pole on the road, back, underground about 800 feet to a neighbors yard where it stops at a transformer. There is a creek the runs perpe...
    last modified by seve.anderson
  • NEC Art. 630.23 & 630.24

    I understand dedication of hoistway, machine room, etc. branch circuits for receptacles in these spaces.  Can I put the lighting in the elevator hoistway and adjacent machine room on the same circuit?  Or ar...
    last modified by dfuhrman
  • LOW Voltage 12V DC NFPA Code

    Hi, I am new to the USA (from Australia) and I want to know if there is a NFPA standard that relates to 12V DC electrical wiring for Fire Apparatus and any associated equipment fitted to a Fire Apparatus.   I pu...
    last modified by geue
  • Campus emergency (NEC 700) & Legally Required Standby Systems (NEC 701) and optional systems.

    A collage campus emergency (NEC 700) & Legally Required Standby Systems (NEC 701) and optional systems. To do everything on campus.  They are asking for is to install one 700 KW natural gas generator tha...
    last modified by david.heiliger
  • 220 and 110 outlets on 1 double pole breaker (random theoretical question)

    OK So this is probably gonna sound a bit random and possibly bizarre but say if I imported a domestic 220 outlet from Europe and wanted to wire it to a double pole breaker for only one part of a house, would it b...
    last modified by chrismedellin91
  • 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