• Two services multi occupancy building

    Attached sketch shows utility xfmr1 200A 480/277V existing which feeds the existing fdr #1 electrical room in multi occupancy bldg. The plans now show new xfmr2 800A 480/277V which feeds thru new fdr #2 Electrical R...
    apurvadave
    last modified by apurvadave
  • Fire rate cables for LPG leak detection

    I would like to know in which NFPA that requires the cables used in the LPG detection system shall be fire rated cables? is it NFPA 54 or 70? which section exactly, please?
    eng_mikemo
    last modified by eng_mikemo
  • Neutral to earth voltage is high.

    We are facing a peculier problem of Neutral to Earth voltage high.   2MVA Transformer 11KV/0.433KV , Dry type transformer is installed with LT drives.   When Drives are running in Regenerative Mode Neutral...
    vannamani.a
    last modified by vannamani.a
  • Is it advisable to dress or clamping in ( LT 415V) charged cable?

    LT 15V Cables are already laid and charged in Ladder type cable trays. Is it advisable to dress or clamp the cables in charged condition? Will it be safe? What precaution is to be taken?
    vannamani.a
    last modified by vannamani.a
  • What are the guidelines for location of an emergency shower or eyewash station in proximity to electrical equipment and enclosures?

    What are the guidelines for location of an emergency shower or eyewash station in proximity to electrical equipment and enclosures? Is the location as it exists dry, damp or wet type (NFPA70 NEC2017 100)?  Will ...
    wgrayg
    last modified by wgrayg
  • 70E article 250 Test Instruments

    70E article 250.2(B) requires testing of devices listed in 250.1(1) thru 50.1(14) that is used as primary protection from shock hazards and requires an insulation system to ensure protection of personnel, sh...
    sunil.ghedia
    last modified by sunil.ghedia
  • metallic conduits for pv under roof sheathing

    In search of any reference to installing residential pv system and fastening metallic conduit to and distance required from underside of wooden roof sheathing.
    mkidwell
    last modified by mkidwell
  • Working 120v Live

    When working 120Volt Circuits live Receptacles, switches what PPE is required?
    justin.grantham
    last modified by justin.grantham
  • 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...
    jesus.rodriguez1808
    last modified by jesus.rodriguez1808
  • 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...
    jrendon6861
    last modified by jrendon6861
  • Cell tower

    I have existing monopole tower for antenna which is grounded and bonded.   Now the structural engineer is going to place long shaft metal plate metallic on each side of the monopole tower by drilling holes in to...
    apurvadave
    last modified by apurvadave
  • Arc Flash PPE when meggering cable?

    Are you required to wear Arc Flash PPE other than shock protection when meggering cable?
    jack.barnhill
    last modified by jack.barnhill
  • OSHA - 70E Adoption

    Has OSHA adopted 70E as part the regulation? My understanding is that OSHA use 70E as their reference for enforcement. How to be safe.
    felixprbase
    last modified by felixprbase
  • Dimensions of arc flash labels

    Hello,   The company I work for is looking to offer arc flash analyses and I've been the person selected to get everything started.  My question is regarding the labels themselves.  I've seen a lot of ...
    cmoe
    last modified by cmoe
  • Amp reading access in a fire pump panel

    There is a local inspection company that has told several clients they need a new electrical fire pump panel because they would have to open it to get amp readings.  they are writing it up as a violation.  I...
    sgallagher4903
    last modified by sgallagher4903
  • Electric outlets in the floor

    What are the rules for floor outlets on a stage in a elementary school?  Thanks John
    sowden
    last modified by sowden
  • main lug sub-panel

    main lug subpanel  I was working on a 200 amp panel and I came across a sub-panel 8 space 8 circuit maxed out  that has an overcurrent protection 2 pole 30 amp with a 10/3wire  the 200 amp is maxed ou...
    homevisionin
    last modified by homevisionin
  • Protective rubber glove protection

    Hello Gentlemen, I am an instructor here in Brazil, and in class, electricians always complain that they cannot use the insulating glove in conjunction with the leather glove to perform tasks that require greater &ldq...
    nelsoncanteri
    last modified by nelsoncanteri
  • What PPE is Required and used during a Zero Energy Verification

    As it pertains to NFPA 70E's requirement of placing a device, piece of equipment etc in a "Electrically Safe State", you turn off a breaker to a light switch or outlet. The next step is to verify via a meter that the ...
    carledge
    last modified by carledge
  • What PPE Category is Required in Verifying Zero Energy?

    As it pertains to NFPA 70E's requirement of placing a device, piece of equipment etc in a "Electrically Safe State", you turn off a breaker to a light switch or outlet. The next step is to verify via a meter that the ...
    carledge
    last modified by carledge