• DACT & PRIMARY SUPPLY MONITORING

    Hi,        I would like to know one thing related to the Fire Alarm system Status Monitoring Device (MOST PROBABLY A DACT). We have one third party agency to monitor the Fire Alarm system, install...
    abhinand.848@gmail.com
    last modified by abhinand.848@gmail.com
  • Code Question of the Week

    A dwelling has an attached garage. The garage receptacle must be GFCI protected if:   It is a 30-amp, single phase receptacle It is a 20-amp, single phase receptacle It is rated 60-amp, 240-volt, and within 6-fo...
    chiefns830
    last modified by chiefns830
  • My tool pouch was taken - what should I do?

    I need the pdf version of NEC just like I need my screwdriver and lineman's pliers at my right hip.  How do you feel about NFPA eliminating pdf version of 2020 NEC?
    chiefns830
    last modified by chiefns830
  • Single Family Dwelling, Load Calculations

    I'm looking for some help, I have all basic calculations done. The total General Lighting Load, Fixed Appliances, Dryer, cooking equipment, HVAC loads,etc. I need to find the largest motor load and cannot use the A/C ...
    killerbabe79
    last modified by killerbabe79
  • transformer secondary and primary protection

    A 45KVA transformer located in the basement, 460 volt 3 phase primary out to a 120/208 volt 3 phase circuit breaker panel on the second floor of a 2 story building. The primary protection is a 460 volt 3 pole breaker ...
    epatterson@jmeuc.com
    last modified by epatterson@jmeuc.com
  • What was the last year (edition) that the NEC used Fine Print Notes (FPN)?

    What was the last year (edition) that the NEC used Fine Print Notes (FPN)?
    chiefns830
    last modified by chiefns830
  • When am I required to wear PPE

    From the very beginning of my exposure to the NFPA 70E I have been taught that if I am inside the limited approach boundary with exposed energized conductors i have to wear appropriate ARC rated PPE.  My manageme...
    jmerati
    last modified by jmerati
  • Minimum Working Clearance

    NEC 110.26 lists working space where examination, adjustment, servicing, or maintenance while energized can occur. For a fused safety disconnect switch, say 30/3 this will apply.  For a non-fused safety disconnec...
    j_w_hines
    last modified by j_w_hines
  • Article 695 - Fire Pump Disconnecting Means

    Is it allowed to use a molded case switch (magnetic only) for the fire pump disconnecting means? If so, how is it sized since LRC (lock rotor current applies to overcurrent protection only.
    div16000
    last modified by div16000
  • Feeder Conductors in Parallel

    My question has to do with ampacity of feeder conductors in parallel. Parallel feeds must follow 310.10(H), last time I checked. 310.10(H) states that it's only allowed if one follows 310.10(H)(2) through 310.10(H)(...
    chiefns830
    last modified by chiefns830
  • Maximum Transformer Primary Distance

    For a transformer, 450.14 states that where the primary disconnect is remote, it is to be lockable per 110.25 and the location field marked.  For a large building (500K-1M Sqft), is there a code limit to this dis...
    j_w_hines
    last modified by j_w_hines
  • 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...
    seyhun.ramazanov
    last modified by seyhun.ramazanov
  • Fuel Storage Room Electrical

    We have a room in a vacant building that is scheduled to be converted into a "Fuel Storage Room." The items range from 55gal drums of  hydraulic fluid, motor oil, antifreeze, and air compressor lubricant. Aside f...
    sarahw
    last modified by sarahw
  • Continual use of USB Ports in computer monitors

    USB fans plugged into USB ports located in computer monitors - I think if the fan power matches the USB port power we are OK (500mA), but not sure.   Second piece is if the monitor goes to sleep, does power to t...
    dankertj
    last modified by dankertj
  • NFPA 780 Annex L

    ADJ is defined by equation L.6.6.1.4 as the equivalent collection area of the adjacent structure which equals 40xLL. However, this is the same methodology in the determination of AL. Seems that the methodology used sh...
    kbourassa
    created by kbourassa
  • Whats the minimum size, general - use snap switch, for a 1 1/2 HP, single phase, 230 V, AC Motor ? I have searched everywhere in the codes. Not sure how to get the correct calculation. Residential Electrician, apprentice

    Whats the minimum size, general - use snap switch, for a 1 1/2 HP, single phase, 230 V, AC Motor ? I have searched everywhere in the codes. Not sure how to get the correct calculation. Residential Electrician, apprentice
    killerbabe79
    last modified by killerbabe79
  • Wound Rotor Motor Fusing (Question of the Week)

    What is the correct fuse rating to provide short-circuit protection for a 100 HP, 200 V, 3 phase, wound rotor motor? A. 200A B. 250A C. 300A D. 110A    This question is on a test for Residential Electrician ...
    rcramereleceng
    created by rcramereleceng
  • Elevator Hoistway Branch Circuit Wiring

    Requesting clarification on NFPA 70, NEC Handbook 2017: 620.24 Branch Circuit for Hoistway Pit Lighting and Receptacle (A) Separate Branch Circuits. Separate branch circuits shall supply the pit lighting and recepta...
    rde@homcorenaissance.com
    last modified by rde@homcorenaissance.com
  • Shipping

    I work for a dredge company working aboard a vessel. I am confused by the "Extension Cord" issue. The company likes to refer to the OSHA rules as they are tied to the shore side of operations as well. Where I am only ...
    gigconroy
    last modified by gigconroy
  • 2 Chiller - redundancy

    I have two, large commercial chillers.  One will operate at any given time.  The designer is attempting to use an ATS to switch between which chiller will operate.  I'm told that there will be a "remote...
    chiefns830
    last modified by chiefns830