• Machine Frame grounding

    A machine section has a 480V motor driven roll. The motor is grounded per 430.242. Under 250.110, I say the machine frame itself needs to be grounded but the electrician says no, that’s a NFPA 79 thing. I say ma...
    last modified by kevin_wood
  • Energy Storage Systems

    Our data centre client is proposing to locate Lithium-ion batteries (energy storage system) into the server racks in the data centre halls. I have read the Fire Protection Research Foundation report from May 2019 rega...
    last modified by pcharman
  • Soow cable from ceiling

    Just need a second opinion I have a customer that has soow cord hanging from the ceiling connected to cnc machines if I am correct this is against code they have conduit running to the boxes and soow cord coming down ...
    last modified by erick.martinez
  • Good afternoon, I would like to know if there exists a code, law, or rule that indicates it is mandatory to do electrical safety inspections periodically, at buildings and homes in order to avoid home fires.Thanks in advance. Cordially, Loraine

    Good afternoon, I would like to know if there exists a code, law, or rule that indicates it is mandatory to do electrical safety inspections periodically, at existing buildings and homes in order to avoid home f...
    last modified by lorainejulio81
  • 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 ...
    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...
    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
    last modified by sowden
  • Relocatable Power Tap or Additional Outlet

    Hoping to hear some opinions about the dilemma.   Situation:  A home entertainment center, which now has an uninterruptible power supply.  The UPS is currently plugged into an outlet, definitely accept...
    last modified by sub3marathonman
  • Fountain that does not share pool water

    I have permanent decorative fountain in ground for aesthetic purpose that does not have water common to pool. I see that per Part V NEC 2014 Section 680.50, Part II which include equipotential bonding only applies if ...
    last modified by apurvadave
  • 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...
    last modified by homevisionin
  • Does a UPS (supporting computer and telemetry) in a patient care room but outside the patient care vicinity need UL 1363 approval?

    I am an electrician at a VA health care facility. I was recently tasked with doing a Relocatable Power Tap (RPT) audit of all of our patient care rooms. I understand that the area within 6 feet of where the patient re...
    last modified by thomas.crozier
  • 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 ...
    last modified by carledge
  • NEC 2014 Section 250.64

    I have electrical service conductors going into trough.  From trough inside service cables their is connection tap three separate service  disco enclosures with fuses.   I have one grounding electrode ...
    last modified by apurvadave
  • Do I need to test exit signs which have a battery backup but are also on Emergency generator power?

    Healthcare facility
    last modified by michaeldepadova.chfm
  • Fire protection requirements for a Ship-to-Ship (STS) transfer operation

    Dear Sir,   We are working on the fire protection system for a Ship-to-Ship (STS) transfer operation is the cargo transfer between two ships that are moored alongside each other. Types of cargo transferred via ...
    last modified by chong
  • Will a receptacle outlet mounted below a kitchen wall mounted counter top be counted as one of the required receptacle outlets in the 2020 NEC for section 210.52(C)(3)?

    The wording in the 2017 NEC regarding physically impaired and totally flat counter tops at islands and peninsulas has been removed. 
    last modified by lfelsch
  • Transformer tap changer

    I have small storage room which has 75kVA transformer 480V to 208/120V three phase with tap changer primary side.  The transformer secondary feeds Panel A in the same room.   The Panel A feeds receptacles,...
    last modified by apurvadave
  • NEC 334 Nonmetallic

    NEC 334 Nonmetallic – sheathed cable (Romax) Type NM / NMC & NMS. What does the B stand for in NM- B cable? Aluminum or copper clad aluminum manufactures, are sending this information and it can not be fou...
    last modified by david.heiliger
  • Don't mess around with compliance at a BHO lab...

    Watch the guys on the ladder   https://www.youtube.com/watch?v=Fg36duyIsAs   
    created by chiefns830
  • NFPA 20

    I am not sure this goes to fire protection system.  I have dedicated utility service that feed service rated fire pump controller to fire pump.  I need to know the circuit breaker internal in the fire pump c...
    last modified by apurvadave