• Lightning protection from tower NFPA 70 artcle 250.60 & 106 and NFPA 780

    Lightning protection systems NFPA 780 and NFPA 70 article 250.60 and 250.106   I have a design with has multiple towers on these towers the manufacturer has lighting strike protection, the tower is aluminum they...
    last modified by c.valvo
  • Code Compliance of Existing Installation

    Is anyone aware of a NFPA code/standard or other citable industry authority that generally discusses that code compliance for an existing installation is determined by the code in effect at the time of construction?&#...
    last modified by gbstand
  • 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...
    last modified by apurvadave
  • 408.4(A) Approved degree of detail

    Someone please, inform me.  What is a "poke through?" Does this have an approved degree of detail? Is this meaning clear? Am I being unfair by not signing off on this?
    last modified by chiefns830
  • Lab Natural Gas Serrated Hose Nozzle; Hazardous Zone

    For a lab with a serrated hoze nozzle and valve for natural gas used in heating small burners, is this a hazardous zone and if so is there a hazardous zone diagram?  NFPA 497 offers some help, but not specific to...
    last modified by j_w_hines
  • Article 445 Question

    Does a Turbine fall under Article 445, specifically a Capstone C1000S?
    last modified by chiefns830
  • Light above shower

    In a residential bathroom is the light over the shower required to be GFI protected?
    last modified by davidvartanoff
  • Eaton Transfer switch? 695.3(G) [2017]

    Can someone help me? I'm being told that this is the model number for a fire pump transfer switch:   AT-V-3-LDA-3-0400-B-S-U   I can't seem to pull it up.  In addition, I'm thinking that it is just a...
    last modified by chiefns830
  • Arc Flash PPE when meggering cable?

    Are you required to wear Arc Flash PPE other than shock protection when meggering cable?
    last modified by jack.barnhill
  • 2011 NEC Question

    210.60 Guest Rooms, Guest Suites, Dormitories, and Similar Occupancies.   (A) General. Guest rooms or guest suites in hotels, motels, sleeping rooms in dormitories, and similar occupancies shall have receptac...
    last modified by chiefns830
  • NFPA 72 Sec. - 2019 Edition Pre-Action Monitoring

    Does section of the NFPA 72 2019 edition apply to pre-action sprinkler systems?
    last modified by imran.malik
  • EPS load test.

    I have a question about running the monthly load test for an EPS. I work for a hospital and I am running the load tests for our 800 KW generators. According to the compliance guy, the load must be over 30% of the na...
    last modified by shagunaa
  • grounding electrode conductor connection to concrete encased electrode

    NEC 2014 Section 250.52(A)(3) states that 1/2 inch or larger rebar bonded by tie wire (20 ft or more) can be used as the grounding electrode. When attaching the grounding electrode conductor to the rebar to be encased...
    last modified by apurvadave
  • Article 220-22

    Hi, i would like to know article 220-22 still available in NEC? as we can't find in our book.  Thanks
    last modified by cl_yeoh
  • 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
  • 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.
    last modified by mkidwell
  • 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