• City Refuses to Close Electric permit due to lack of UL certificate.

    Hello, we imported Electron-Beam Welding machine from EU to US. We invited UL inspector for the Field Inspection and received a lot of comments. While we working on UL's coments, our city's electric engineer refuses t...
    last modified by seyhun.ramazanov
  • Tamper - Resistant Receptacles

      Can you please help me regarding the 2017 NEC article 406.12 (2). Guest rooms and guest suites of hotels and motels and Exception (2). My understanding of the article, all 15 and 20 amp receptacles shall be tam...
    last modified by michael.howard
  • Generator Overcurrent Protection

    NEC 445.12 includes the overcurrent protection requirements for generators. Conductor protection is located in 445.13 (B) and that protective device may or may not be the same as the generator protection. The overcurr...
    last modified by dcook
  • TRAY

    I have a question regarding the use of cable tray in meeting links because here in Colombia it is not accepted in these places and I do not find any reason that the NFPA70E says that the tray is not considered a chann...
    last modified by ingmartingarcia@gmail.com
  • NFPA 79 Inspector needed

    I'm looking for a 3rd party inspector to inspect a machine to NFPA 79 standard in the Wisconsin area.   Any suggestions.
    last modified by mwessel
  • Speaker wire support in drop ceiling

    Hello, first time user, so please forgive my ignorance.. I have about 400pcs of 3" Soundmasking speakers to be installed in drop ceilings, commercial space. I am aware of code requirements for supporting multiple low...
    last modified by niksa
  • Service Disconnect Location

    I have a question in regards to service disconnects. Section 230.70 A1 of the NEC states "The service disconnecting means shall be installed at a readily accessible location either outside of a building or structure o...
    last modified by bestic.6
  • Electrical safety weekly topics

    What is the best source to get on an emailing list for weekly, plus or minus, safety topics to use in safety meetings in an electrical industry? Expecially Arc Flash topics but general electrical safety topics are nee...
    last modified by michael.d.beasley30.civ
  • Knowledgeable Person

    Is there a industry excepted definition of a Knowledgeable Person.  I am working on updating my EEWP and we are looking into the approval portion and would like to have a knowledgeable person in this pr...
    last modified by jmerati
  • breaker size

    can a single breaker of 250A MCCB can supply power to the two motors of rated 150 KW each or shall we have two diffrent breakers for each motor
    last modified by maqsoodasif17
  • Solar Pole Lighting Voltages

    Hello I am developing a solar pole light for walkways.  It is self contained, contains Lithium Ion batteries, and not connected to the grid.  I am wondering at what voltages (solar panel, battery or LED dri...
    last modified by dleverton
  • Absence of Voltage Testing

    According to the NFPA 70E, when are noncontact test instruments permitted to be used to verify absence of voltage in circuits less than 1000 volts? 
    Steve Benton
    last modified by Steve Benton
  • Operating Generators and NFPA-70E

    I am being challenged by our work group regarding working on a HV generator set (11kV) that is in close proximity to other operating generators at 11kV within a powerstation.  From NFPA-70E Table 130.7(C)(15)(a) ...
    last modified by alan.peet
  • Electrical Equipment Labeling- QR Code

    Imagine being asked to have a look at a piece of equipment that is having some issues or perhaps you might just be doing periodic maintenance and inspections. The equipment could be any number of types but I’ll ...
    Steve Benton
    created by Steve Benton
  • If we install air aspirating system then there is no need of infra red beam detectors as per standard?

    We have oil rig Manufacturing warehouse of  length 128.12 , width 62.82 and height 13 meters,contractor  has proposed vesda  air aspirating  system, saying that if we install  air aspirating d...
    last modified by maqsoodasif17
  • charge controllers

    Per 690.72(B), two charge controllers may be required if one diversion controller is part of a PV system. Does anyone know how to check a listing to verify compliance with this code section? I can't find any source, a...
    last modified by rwelch
  • Question about NEC 348.20, FMC Run Length

    Hello All,   I am an trying to find out if the 6 ft rule for FMC has always been in place, or if it was added at some point after the first NEC was released?   Also, if it was added after a certain point, ...
    last modified by srpl
  • NFPA 70 for deep well pump application Class 1 Division 2

    I have a project that takes storm water (not sewage) via gravity flow into an underground storage system (all debris has been removed prior to entering storage). This water will be treated via recirculation using...
    last modified by jalmaraz
  • light and power circuit in same trunk

    Can i run power  circuit and light circuit in same conduit or trunk of same voltage ?
    last modified by maqsoodasif17
  • Transformer Bonding conductor size from XO to frame

    What is correct table for sizing the conductor between the Neutral and the transformer frame/enclosure for a dry type indoor 480V-208/120V transformer?  The transformer is part of a premises wiring system, not a ...
    last modified by trapp