• Meter main combo wiring

    With a meter main disconnect combo. Using the main lugs from the disconnect (not one of the additional breakers in the M M combo) to run cable to a interior panel board. Would this designate my Interior panel board as...
    last modified by charlesvanmeter
  • equipment grouding conductor used as a bonding jumper.

    Can you use a equipment grounding conductor as a means of a bonding jumper for conduit. I have always used a separate wire for the bonding jumper.   r.
    last modified by aaronlewin4
  • MC cable for PV installation

    Article 330.12 prohibits MC cable when exposed to mechanical damage. 690.31(D) allows MC cable when intalled in an area that is not readily accessible.  My client wants to install MC cable across the open roof of...
    last modified by jeffrey
  • Distance between the HVAC DUCT and Power Socket

    As per standard what is the required space between vertical HVAC Duct & Power socket on wall. 
    last modified by lllsadiqlll
  • 2017 NEC Section 300.10,250.96,20.118(6) Electrical continuity

    What is the meaning of electrical continuity as far as bonding and grounding requirements per NEC?   For example: 30" length of 4" diameter of LFMC on one end of pipe then connects to 60 feet of 4" diameter of r...
    last modified by daniel.burr
  • hot Tube installation

    I installed an outdoor  hot tub about a week ago, the outside of the tub is plastic we poured a concrete slab with rebar since the hot tub  is made out of plastic all surroundings of the hot tub a...
    last modified by homevisionin
  • mounted fuel tank

    hi everybody  i hope you are all ok.... In NFPA-110 chapter 3 in the general definitions, it is mentioned that: Integral fuel tank in EPS systems: Afuel tank furnished by the EPS supplier and mounted o...
    created by alonazay
  • 2017 NEC Section 300.10, 250.96, 250.118(6)

    what exactly does electrical continuity mean in a bonding or grounding sense per NEC.  i have 30" of 4" LFMC on one end of my pipe run that connects to 60 feet of 4" rigid  One end terminates in a switchge...
    last modified by daniel.burr
  • Floor Surface Resistance to Ground

    A contract requires measuring resistance of floor surface to ground per "the latest" NFPA 99 edition that covers it. According to reliable sources "floor surface resistance to ground" was removed from NFPA 99 in...
    last modified by raymonddeza
  • 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